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    Treatment ideas and technical measures of black and stinky water bodies
    ZHU Yunjie,LI Guowen,ZHANG Lieyu,XU Qiujin,SONG Yonghui
    Journal of Environmental Engineering Technology    2018, 8 (5): 495-501.   doi: 10.3969/j.issn.1674-991X.2018.05.065
    Abstract989)   HTML12)    PDF(pc) (893KB)(295)      

    In China the blackening and stinking of urban waters is a common phenomenon. At present, large-scale governance of black and stinky (BS) water bodies is underway. The seriousness of the problem of BS water bodies in China was briefly introduced, and the current national policy and governance objectives for the treatment of BS water bodies elaborated. The concept of BS water bodies was analyzed, and the idea for their treatment was put forward. The treatment technical route was clarified, including the investigation and diagnosis of problems, the verification of pollutant loads, and the determination of treatment targets of BS water bodies. Formulation of applicable technologies and governance programs, and forecasting of governance effects were also involved. On these bases, the main technical measures for the treatment of BS water bodies were proposed, including pollution source control, hydraulic regulation and ecological restoration, and meanwhile, it was noted that comprehensive management must be strengthened. The progress and of governance cases of BS water bodies at home and abroad were reviewed, and the governance process and existing problems were analyzed. Finally, the suggestions for the treatment of BS water bodies were proposed from four aspects, i.e. the evaluation indicators, the technical systems, the management mechanisms, and the publicity and education.

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    The cause for abnormal water quality deterioration of Waihai of Dianchi Lake in 2017 and the countermeasures
    ZHENG Binghui,PENG Jiayu,HU Xiaozhen,CHU Zhaosheng,PANG Yan,WANG Lijing,XU Xiaomei,HE Jia
    Journal of Environmental Engineering Technology    2018, 8 (5): 465-472.   doi: 10.3969/j.issn.1674-991X.2018.05.061
    Abstract482)   HTML11)    PDF(pc) (4592KB)(416)      

    The water quality of Waihai of Dianchi Lake abnormally deteriorated from Ⅴclass to worse than Ⅴclass (Environmental Quality Standards for Surface Water (GB 3838-2002) ) in 2017. Particularly, the concentration of water quality indicators, TP, TN, CODCr and Chla, abnormally rose during June to August. The roots causing the water quality deterioration are as following: compared with the same period of the last year, the precipitation increased by 81% during June to August in 2017, and it is the highest since 1999. Because of the abnormal precipitation, the pollution loads of TN, TP carried by Baoxiang River, Panlong River and Jinzhi River which are the main inflows of Waihai increased by 50% and 59%, respectively, directly leading to the water deterioration of the north of Waihai. In addition, the combined sewage interception system was overflow during the rainstorm, leading to the low collection rate of waste water treatment plants (WWTPs). Compared with the dry season, the average influent concentration of CODCr, TN, TP of the WWTPs of No.2, No.3, No.4 and No.9 decreased by 15%, 15% and 20% in rainy season, and the average influent concentration of CODCr, TN, TP of the WWTPs of No.10 decreased by 16%,19% and 8%, respectively. Meanwhile, compared with the year of 2016, the water supply by Niulanjiang water transfer project decreased by 50%, the concentration of NH3-N, TP, TN increased by 75.2%, 51.1%, 40.2%, and therefore the effect of water quality improvement was reduced. Four strategies to improve the water quality of Waihai of Dianchi Lake were proposed, including improving the sewage collection system and enhancing the efficiency of wastewater collection by advancing the check of pollution interception system; improving the regulation of the combined sewage by optimizing the operation of the built storage pools; improving the purifying rate of sewage treatment plant by optimizing operation, enhancing supervision and joint operation in rainy season; improving the environment efficiency of water supplement project by enhancing the protection and governance of water source area of Niulanjiang River.

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    Nutritional characteristics and aquatic ecosystem health assessment in cascade reservoirs of Wuxijiang
    ZHANG Xiaolin,ZHANG Jingtian,CHI Chunjuan,MA Chunzi,LI Xiaochuang,XIAO Zhe,AN Zhenzhen
    Journal of Environmental Engineering Technology    2018, 8 (5): 502-509.   doi: 10.3969/j.issn.1674-991X.2018.05.066
    Abstract410)   HTML0)    PDF(pc) (1042KB)(290)      

    Extensive cascading hydropower dam exploitation may profoundly affect the river ecosystem health. The nutritional characteristics and community structure of phytoplankton in upstream Hunanzhen reservoir and downstream Huangtankou reservoir in Wuxijiang cascade reservoirs from June 2017 to November 2017 were investigated, and the assessment of the reservoir aquatic ecosystem health was performed by Index of Biological Integrity (IBI) method. The results indicated that nitrogen, phosphorus and organic matter contents of Wuxijiang cascade reservoirs were low, the nutritional level was poor. The 152 taxa of phytoplankton belonging to 8 phyla were identified, the densities of cyanobacteria and chlorophyte were high, and the phytoplankton density in downstream Huangtankou reservoir was lower than that in upstream Hunanzhen reservoir. The IBI assessment result showed that Wuxijiang cascade reservoirs were in relatively high biological integrity, and at normal to sub-health level. The IBI index was significantly affected by the water temperature, suggesting that the good health level was found in Huangtankou reservoir with low water temperature, but in Hunanzhen reservoir with high water temperature.

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    Buffer type identification and water quality status of inflow rivers under different buffer patterns in Lake Erhai
    WAN Zhengfen,LU Shaoyong*,JIN Xiangcan,BI Bin,JIN Xiangcan,CHEN Fangxin,QIN Pan,LI Linlin
    Journal of Environmental Engineering Technology    2018, 8 (5): 475-480.   doi: 10.3969/j.issn.1674-991X.2018.05.062
    Abstract389)   HTML5)    PDF(pc) (1655KB)(250)      

    Focusing on the buffer zones of Lake Erhai, and using combined methods of on-site investigation, spatial analysis and data survey, the buffer types of Lake Erhai were identified and the water quality of the inflow rivers under different buffer patterns were analyzed. The results indicated that the buffer structure of Lake Erhai is unreasonable, with excessive proportion of farmland-type and village-type buffer zones. In addition, both the area and shoreline of the village buffer patterns close to the inner parts accounted for over 60% of the buffer zones of Lake Erhai, which mainly located in the western part of the lake. The water quality of main inflow rivers was generally poor, being Class Ⅳ and inferior Ⅴ. The buffer zones of the Tao stream and the Luoshi River were typical “outer cycle-village-farmland-village-inner circle” and “outer cycle-farmland-village-farmland-inner circle” respectively, with inferior Ⅴ class of surface water quality, mainly affected by non-point source pollution such as agricultural non-point sources, residential sources, and tourism pollution. In Lake Erhai buffer zones, the village-type buffers have a large number of external pollution load inputs, while the non-point sources from farmland-type buffers with high fertilization rates and highly polluted decentralized livestock and poultry have direct impacts on the river water quality. Therefore, the area of village-type and farmland-type buffer zones nearby Lake Erhai should be strictly controlled and non-point source pollution from village residential sources, farmland sources and tourism sources should be reduced.

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    Application of data assimilation method in updating emission inventory
    WANG Jikang, ZHANG Hengde, ZHANG Bihui, YANG Xiaolu
    Journal of Environmental Engineering Technology    2018, 8 (6): 577-585.   doi: 10.3969/j.issn.1674-991X.2018.06.077
    Abstract364)   HTML43)    PDF(pc) (931KB)(173)      

    Data assimilation is to use the observed data to update the pollution sources from top to bottom, which could provide a fast way to update and verify the emission inventories, and also add further information about the temporal variation and some sources that could not easily be quantified by traditional bottom-up methods. The basic principles of several assimilation inversion methods, including the mass balance ,ensemble Calman filter and four-dimensional variation methods were reviewed, and their application methods in emission inventory inversion and optimization introduced. The acquisition method of observation data and the primary emission inventory, the calculation method of uncertainty, and the acquisition method of the relationship between pollution sources and observation data were also introduced. The application of pollution source assimilation inversion methods at different scales of pollution source inventory inversion, both at home and abroad, were summarized. The ensemble Kalman filter or the 4D variation method combined with adjoint model or decoupling direct method was used to determine the relationship between pollution sources and observation data, able to avoid the nonlinearities in the model to a certain extent. The more accurate observations and more precise air quality model were needed in the future to improve the effect of pollution sources inversion.

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    Changed weight trophic level index method and its application to Longhe tributary of the Three Gorges reservoir area
    HAN Xuemei, FU Guo, LIU Qingqing, ZHANG Shen, ZHAO Jian
    Journal of Environmental Engineering Technology    2018, 8 (6): 627-634.   doi: 10.3969/j.issn.1674-991X.2018.06.083
    Abstract349)   HTML4)    PDF(pc) (969KB)(172)      

    Aiming at the deviation problem existing in the evaluation method of weighted average comprehensive nutritional status index TLI(Σ), when making by averaging the values of five evaluation indexes, including Chla, TP ,TN, SD and CODMn. The expressing efficacy of nutrient levels of different evaluation indicators under different lake conditions (nitrogen limitation, phosphorus limitation, nitrogen-phosphorus synergistic effect) was analyzed. The three indicators of Chla, TP and TN were selected as evaluation indicators, and the changed weight trophic level index (TLICW) evaluation method for comprehensive nutritional status index was obtained by comparing the apparent and potential nutritional status indexes. The method was applied in the Longhe River, a tributary of the Three Gorges Reservoir area. It showed that the TLICW method with variable weights was more prominent in describing the characteristics of nutritional status than the TLI(Σ) method. It was in the status of light eutrophication evaluated by TLICW method while in the status of mesotrophication by TLI(Σ) method. The TLICW mean value determined by the multi-lake response relationship reveals that Longhe River was one trohpic level higher than determined by the Longhe River response relationship. The eutrophication thresholds of the TP and TN determined by the Longhe River response relationship was of 2.75 and 3.00 times respectively of multi-lake response relationship, indicating that there was a clear over-protection problem when the multi-lake response relationship was used in the eutrophication evaluation of Longhe River.

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    Nitrogen removal of simulated low-polluted water of Lake Erhai buffer zone by surface-flow wetland
    ZHANG Junpeng,LU Yifeng,GUO Xiaochun,LU Shaoyong,WU Xin
    Journal of Environmental Engineering Technology    2018, 8 (5): 488-494.   doi: 10.3969/j.issn.1674-991X.2018.05.064
    Abstract348)   HTML1)    PDF(pc) (1882KB)(331)      

    Aiming at the pollution problem of typical low-polluted water (produced by agricultural non-point sources) in Lake Erhai buffer zone, the typical buffer zone mostly occupied by farmland between Baihe Stream and Mei Stream in the western Lake Erhai basin were selected to monitor the surface runoff quality of the buffer zone, and to set up the surface flow pilot wetland for field study. The nitrogen removal effect for simulated low-polluted water of Lake Erhai buffer zone from September 2016 to August 2017 was studied. The results indicate that the pilot system has a high nitrogen removal effect, with annual average removal rate of total nitrogen as Nymphoides peltatum wetland (83.1%) >reed wetland (73.9%) >Hydrilla verticillata wetland (73.3%) >blank wetland (65.5%). The average annual removal rate of ammonia nitrogen was higher than 77%. Among different plant systems, Nymphoides peltatum system has the best removal effect of total nitrogen and the most stable removal rate. The removal rate and width of each system were simulated, and it reveals that the optimum width of the Nymphoides peltatum, Hydrilla verticillata and Phragmites communis wetland systems was respectively 7.04 m, 8.64 m and 6.92 m while the effluent water quality is of class Ⅲ water. The contribution rate of nitrogen removal in Nymphoides peltatum, Hydrilla verticillata and Phragmites communis wetland systems during the test is 5.88%, 3.23% and 21.12%, respectively. The total nitrogen content of reeds in wetlands is significantly higher than that of Nymphoides peltatum and Hydrilla verticillata. The contribution rate of Phragmites communis and Hydrilla verticillata to nitrogen removal in wetland shows a large seasonal difference, while the contribution rate of Nymphoides peltatum in wetland to nitrogen removal in different seasons varies little.

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    Study of multi-dimensional water quality safety evaluation method: taking Taihu Lake as an example
    ZHAO Yanmin, CAO Wei, ZHANG Lei, MA Yingqun, QIN Yanwen, LIU Zhichao, YANG Chenchen
    Journal of Environmental Engineering Technology    2018, 8 (6): 595-601.   doi: 10.3969/j.issn.1674-991X.2018.06.079
    Abstract340)   HTML6)    PDF(pc) (950KB)(233)      

    Based on the characteristics of water pollution of Taihu Lake, the indicators including water quality, eutrophication, water bloom occurrence and health risk were screened, and a multi-dimensional water quality safety evaluation index system consisting of 4 secondary indicators and 21 tertiary indicators was constructed. Analytic Hierarchy Process (AHP) method was applied to determine the weight of the indicators. The survey data of Taihu Lake in 2012 was used to evaluate the water quality safety grade with the water quality safety index. The results showed that the overall water quality safety of Taihu Lake was only qualified in 2012. The water quality safety grade in the eastern district of lake was medium, while the water quality safety grades in other districts of the lake were qualified. The water quality safety status of Zhushan Lake and Northwest District was the worst, and the water quality safety index was 50.78 and 52.45, respectively. Based on the analysis of the assessment results, eutrophication level and water bloom condition were found to be the main factors affecting the water quality safety of Taihu Lake.

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    The application of hedonic tone in odour pollution sensory evaluation
    ZHAI Zengxiu,LI Weifang,ZOU Kehua,YANG Weihua
    Journal of Environmental Engineering Technology    2018, 8 (5): 546-550.   doi: 10.3969/j.issn.1674-991X.2018.05.072
    Abstract331)   HTML1)    PDF(pc) (853KB)(337)      

    In order to enrich the sensory evaluation indicators of odour pollution in China, a 9-point hedonic tone method was used to determine the hedonic tone of samples at different odour concentrations from three typical odour emission sources including rubber products, bakery and landfill. A comprehensive evaluation model of odour pollution and hedonic tone was put forward by analyzing the relationship between odour concentration (odour index) and hedonic tone, that is, the annoyance potential of source = odour index × hedonic tone. The results showed that the hedonic tone of rubber products and landfill sites was negative value, while that of food processing was positive value. The relationships between the odour concentration and hedonic tone from the three kinds of emission sources are in line with the quadratic polynomial model. In addition, the correlation coefficients all reached above 0.99. The annoyance potential calculation results showed that the annoyance potential of rubber products and the landfill was -200.91 and -144.80 respectively, and that of food processing was 79.66. Applying this method, the different odour sources could be distinguished more intuitively, especially for the sources that have similar odour concentrations and different odours. Then the key emission sources and key emission units could be accurately identified. The research indicated that hedonic tone reflects the psychological impact of odour on people and its harmful degree more accurately, and it is necessary to apply hedonic tone to odour pollution sensory evaluation.

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    Purification effect and stability of water quality of different functional units in Laoyuhe Wetland Park of Dianchi Lake
    SONG Xueyan,MA Lan,ZHAO Haixi,TU Qi,LU Yifeng,LU Shaoyong
    Journal of Environmental Engineering Technology    2019, 9 (2): 167-174.   doi: 10.12153/j.issn.1674-991X.2019.01.030
    Abstract323)   HTML13)    PDF(pc) (3017KB)(38)      

    Taking Laoyuhe Wetland Park (WPlyh) in Dianchi Lake as the research object, sampling points were set up in different functional units of the wetland to analyze the removal effects of CODCr, N H 4 + -N and TP by different functional units in the testing operating period from April 15 th, 2015 to May 14 th, 2015. Sampling points were also set up at the inlet and outlet of wetlands and the long term operation effects in the period from April, 2015 to March, 2017 were monitored and analyzed. It revealed that during the WPlyh test run, the CODCr, N H 4 + -N and TP concentrations in the outlet were significantly lower than those in the inlet, with the removal rates of 40.07%, 48.48% and 40.38%, respectively, while the treatment effect was still unstable. Among the functional units, the surface flow wetland at the entrance of the lake had the best removal effect on CODCr with removal rate of 10.36%, the front part of the inter-forest shallow-water wetland had the best removal effect on N H 4 + -N with the removal rate of 17.59%, and the back part of the inter-forest shallow-water wetland had the best removal effect on TP with the removal rate of 9.44%. It means that the decontamination rate of the inter-forest shallow-water wetland accounted for 53.15% of WPlyh total decontamination rate, which could be regarded as the best purification unit in the wetland parks. WPlyh's monthly reductions and removal rates for CODCr, N H 4 + -N, and TP during long term operation and the removal rates of the three characteristic pollutants showed a downward trend with time. Especially after one year of operation, the downward trend was most obvious.

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    Effects of inflow modes on sewage nitrogen removal by ecological gravel beds
    WU Xin,HE Shuzhuang,LU Yifeng,LU Shaoyong,ZHANG Junpeng,HU Tao,ZHANG Senlin,CHEN Fangxin
    Journal of Environmental Engineering Technology    2018, 8 (5): 481-487.   doi: 10.3969/j.issn.1674-991X.2018.05.063
    Abstract315)   HTML1)    PDF(pc) (1176KB)(237)      

    In order to improve the nitrogen removal rate of residential sewage by ecological gravel beds, four kinds of constructed ecological gravel bed were designed, including Schoenoplectus tabernaemontani bed, Phragmites australis bed, Typha orientalis bed and blank bed without vegetation. The effects of two inflow modes, i.e. continuous inflow and intermittent inflow, on the removal of TN, NH4+-N, and NO3--N were studied. The hydraulic load (HL) was 7.5 cm∕d and the hydraulic retention time (HRT) was 1.8 d under the continuous inflow, while the HL was 7.5 cm∕d and the HRT was 5.4 d under the intermittent inflow. The results show that there exists great difference of the nitrogen removal efficiency between two inflow modes for different ecological gravel beds. The removal rates of TN and ammonia nitrogen under continuous inflow were in the order of Typha orientalis bed> Schoenoplectus tabernaemontani bed > blank bed > Phragmites australis bed, with the highest removal rates by Typha orientalis bed, which removal rate of TN and ammonia nitrogen were 77.68% and 81.33%, respectively; the removal rates of nitrate nitrogen were in the order of blank bed>Phragmites australis bed>Tyha orientalis bed>Schoenoplectus tabernaemontani bed, with thee highest removal rates by blank bed, which removal rate of nitrate nitrogen was 65.29%. The removal rates of TN and ammonia nitrogen under intermittent inflow were in the order of Schoenoplectus tabernaemontani bed > Phragmites australis bed > Typha orientalis bed> blank bed, and the effect of Schoenoplectus tabernaemontani bed was the best, which removal rate of TN and ammonia nitrogen were 89.54% and 91.79%, respectively; the removal rates of nitrate nitrogen were in the order of Schoenoplectus tabernaemontani bed>Typha orientalis bed>blank bed>Phragmites australis bed, the Schoenoplectus tabernaemontanid bed was the best with a removal rate of 46.43%. The removal efficiency of ammonia nitrogen and TN were better improved by intermittent inflow in plant systems. The removal rate of TN and ammonia nitrogen increased by 19.63% and 14.76% in Phragmites australis bed, and the removal rate of TN and ammonia nitrogen increased by 19.14% and 18.60% in Schoenoplectus tabernaemontani bed, respectively.

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    Characterization of VOCs emission in automotive industrial park in Chongqing
    FAN Li,LI Peng,LI Wensheng,ZHAO Jing,LIANG Jian,SONG Dan
    Journal of Environmental Engineering Technology    2018, 8 (5): 571-576.   doi: 10.3969/j.issn.1674-991X.2018.05.076
    Abstract299)   HTML4)    PDF(pc) (1731KB)(314)      

    The emission concentrations, amounts and composition characteristics of volatile organic compounds (VOCs) were investigated from 13 key factories in an automotive industrial park in Chongqing, based on the local standards, i.e. Emission Standrds of Air Pollutants for Surface Coating of Automobile Manuaturing Industry and Emission Standrds of Air Pollutants for Surface Coating of Motocycle and Auto Parts Manuaturing Industry. The results showed that the VOCs concentration of various emission links of the industrial park ranged at 0-243.00 mg∕m 3, with the largest concentration of production being concentrated on the surface coating process. The maximum instantaneous VOCs emission was 141.146 kg∕h, and the VOC emisson from auto parts factories containing surface coating process accounted for 66% of the total emission of the industrial park. The main VOCs matters detected were n-butyl acetate(37%), xylene(30%) and ethylbenzene(18%), and the VOCs species varied with different factories, considerably due to their differences in diluents. Finally, it was proposed that the surface coating of auto parts factories should be the main focus of the environment management in the industrial park.

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    Study on variation characteristics and estimation model of PM2.5 concentration in Beijing in winter
    XIONG Junli,LI Caiyan
    Journal of Environmental Engineering Technology    2018, 8 (5): 533-538.   doi: 10.3969/j.issn.1674-991X.2018.05.070
    Abstract295)   HTML4)    PDF(pc) (806KB)(331)      

    Based on the hourly air quality monitoring data in Beijing in January 2017, the hourly and regional changes of the concentration of PM2.5 in Beijing were discussed, and the estimation models of PM2.5, PM10 and major gaseous pollutants of 12 sites were constructed by multiple stepwise regression. The results showed that the hourly concentration change trend of PM2.5 concentration in Beijing was high at night (18:00-07:00) and low in the daytime (08:00-17:00), the monthly averaged PM2.5 concentrations of 3 sites in Huairou Town, Changping Town and Dingling were relatively low (78-94 μg∕m 3), while that of other sites were between 106-128 μg∕m 3. The correlation between PM10, 4 kinds of gaseous pollutants and PM2.5 was in the order of PM10>CO>NO2>O3>SO2. The adjustment coefficient R adj 2 of the PM2.5 concentration estimation model of the 12 sites was all more than 0.96, and the standard error SE was between 13.6-24.5. It is more effective to estimate the PM2.5 concentration of the site by using the estimation model of the site itself, and the effect of estimating the PM2.5 concentration was poorer by using the data of other sites.

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    Adsorption performance and influencing factors of manganese sand filter media on phenol removal in drinking water treatment plant
    SUN Xiaoling,YANG Yu,MA Zhifei,JIANG Yonghai,DONG Zixuan,LIAN Xinying
    Journal of Environmental Engineering Technology    2018, 8 (5): 510-518.   doi: 10.3969/j.issn.1674-991X.2018.05.067
    Abstract275)   HTML1)    PDF(pc) (2611KB)(294)      

    In order to understand the adsorption performance and influencing factors of manganese sand filter material on phenol, the waste material produced after the operation of biological manganese sand filter was used as adsorbent. The adsorption performance of manganese sand filter material on phenol under different pH, temperature and dissolved oxygen conditions was studied respectively. The adsorption law of manganese sand filter material was studied by adsorption kinetic model and adsorption isotherm model. The results showed that the adsorption process of manganese sand media for phenol was in accordance with the internal diffusion kinetic model and Temkin isothermal adsorption model, being the monolayer adsorption. The adsorption effect was mainly affected by the diffusion rate of phenol. Through the calculation of n value of adsorption isotherm, it is found that manganese sand filter material is easy to adsorb phenol. The pH had the greatest effect on the removal of phenol from manganese sand filter. When pH=3.0, phenol could be removed completely. The removal rate of phenol decreased gradually with the increase of pH. The effect of hypoxia on phenol adsorption was not significant under neutral condition. The removal rate of phenol was increased by increasing the dosage of manganese sand filter material under low temperature condition. The removal rate of phenol was increased 20 percent for every 1.5 times of manganese sand filter material. When that manganese sand filter material is applied to remove phenol from the underground water, the method should achieve the good effect of recycling waste and repairing phenol pollute water body, does not generate secondary pollution phenomenon, and has good application prospects.

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    Research on removal of Taihu Lake algal source DON by KMnO4 pre-oxidation and coagulation sedimentation
    ZHANG Qian,LIU Xiaodong,DENG Feifan*
    Journal of Environmental Engineering Technology    2018, 8 (5): 527-532.   doi: 10.3969/j.issn.1674-991X.2018.05.069
    Abstract275)   HTML0)    PDF(pc) (1136KB)(201)      

    The removal efficiency of dissolved organic nitrogen (DON) in the algae-laden water using KMnO4 pre-oxidation and enhanced coagulation sedimentation was studied by experiment. The mechanism was analyzed using molecular weight distribution measuring method and two-dimensional electrophoresis method. The results showed that the optimal working condition happened when KMnO4 dosage was 1.00 mg∕L, the pre-oxidation time were controlled in 30 min, and the PAC dosage was 20 mg∕L, then the DON removal rates reached 36.0%, the turbidity and algae removal rates reached 88.3% and 93.0%. KMnO4 pre-oxidation enhanced coagulation sedimentation can be used as an emergency treatment option for the removal of DON when the source water algae bloom.

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    Study on ammonia emission of sewage treatment process of a pharmaceutical enterprise in Shijiazhuang
    LIU Cuimian,DOU Hong,JIANG Jianbiao,GAO Yuan,CHANG Qing
    Journal of Environmental Engineering Technology    2018, 8 (5): 551-555.   doi: 10.3969/j.issn.1674-991X.2018.05.073
    Abstract274)   HTML0)    PDF(pc) (785KB)(150)      

    In order to study on ammonia emission characteristics of sewage treatment process of a pharmaceutical enterprise, waste gas samples were collected from several wastewater treatment units and waste gas discharge outlet in sewage treatment progress of pharmaceutical industry to analyze NH3 emission characteristics. The study results showed that:the maximum NH3 emission appeared at hydrolysis acidification unite, the point concentration reached 62.89 mg∕m 3,emission reached 3 360 mg∕m 3 for each treatment of 1 m 3 sewage, The sewage treatment process of each unit of ammonia amount was 0.97 kg∕h, the conversion for each treatment 1 m 3wastewater, ammonia production 9 312 mg∕m 3, after the treatment of waste gas discharged into the environment ammonia was 0.25 kg∕h, emission reached 2 400 mg∕m 3 for each treatment of 1 m 3 sewage, ammonia removal rate was 74.2%, the emission of ammonia gas was obviously reduced after the treatment of exhaust gas. Waste gas treatment in the southern and northern areas adopts the technology of caustic wash+oxidation+washing. The removal rate of ammonia was 93.3% and 83.1%, The ammonia removal rate of the waste gas treatment facility in the biological zone is 39.1%. Caustic wash+oxidation+washing has better effect than biotrickling filter in the removal the ammonia.

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    Study on online monitoring and early warning indicator system of pollution sources in chemical industry
    CAO Wei, QIN Yanwen, ZHANG Lei, ZHAO Yanmin, MA Yingqun, YANG Chenchen
    Journal of Environmental Engineering Technology    2018, 8 (6): 635-641.   doi: 10.3969/j.issn.1674-991X.2018.06.084
    Abstract274)   HTML3)    PDF(pc) (848KB)(84)      

    The accident warning indicators were optimized by the analytic hierarchy process. By calculating and comparing the weights of each indicator, the heavier indicator was selected to form the water pollution accident warning indicator system. On the basis of this, the framework of the pollution sources online monitoring and early warning indicator system was initially constructed in the light of the general production and pollutant discharge situations of the industrial enterprises. Taking the delayed coking process of one enterprise as an example, the above method was applied to analyze the environmental pollution that may occur in the production process, calculate the weights of each indicator using the analytic hierarchy process, and determine the construction process of the early warning indicator system. The indicators that need to be monitored online were finally determined for the delayed coking devices, including CODCr, petroleum hydrocarbon, ammonia nitrogen, sulfides and phenols.

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    EKC test and decoupling analysis of carbon emissions in countries along the “One Belt and One Road”
    WU Na,FU Zeqiang,WANG Yanhua,HE Chuan,FENG Qiang
    Journal of Environmental Engineering Technology    2018, 8 (6): 671-678.   doi: 10.3969/j.issn.1674-991X.2018.06.089
    Abstract272)   HTML4)    PDF(pc) (2729KB)(233)      

    “One Belt and One Road”(OBOR) is a significant initiative proposed by China that shall promote the sustainable development in the countries of the region. One static panel model of Environment Kuznets Curve with cubic term was constructed, and the data of per capita energy consumption, per capita carbon dioxide emissions and real GDP per capita in 2006, 2009, and 2014 in OBOR countries were used to perform EKC test. The results of EKC test showed that the countries were in the phase of the per capita energy consumption decreasing with the increase of per capita GDP and while per capita carbon emissions increasing with the increase of per capita GDP. Meanwhile, the decoupling of per capita carbon dioxide emissions and economic growth in OBOR countries was analyzed. It showed that a transformation from negative dcoupling to decoupling had been experienced in OBOR countries overall. Besides, the current average level of the countries is at the weak decoupling phase. Some solutions such as optimizing structure of energy consumption, strengthening in-depth cooperation on environmental protection and advancing energy-saving and environmental protection industries were presented, to promote the environmental friendly and low-carbon and sustainable development in OBOR countries.

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    Progress in catalytic oxidation of elemental mercury by modified SCR catalysts
    QIN Yadi,WANG Shujuan,ZHUO Yuqun
    Journal of Environmental Engineering Technology    2018, 8 (5): 539-545.   doi: 10.3969/j.issn.1674-991X.2018.05.071
    Abstract272)   HTML0)    PDF(pc) (811KB)(258)      

    Targeting the oxidation of elemental mercury (Hg 0) in the flue gas from coal-fired power plant, the research progress of the catalytic oxidation by modified selected catalytic reduction (SCR) catalysts for elemental mercury was reviewed, focusing on the influence of metal oxides or chlorides doped SCR catalysts on elemental mercury oxidation. The activity of modified SCR catalysts for elemental mercury was explored from the effects of dopant, doping ratio, flue gas components and temperature. In addition, the heterogeneous reaction mechanisms between elemental mercury and the modified SCR catalysts were analyzed synthetically with respects to doping elements and flue gas conditions. Finally, considering the current situation of coal-fired plants, the prospects of future studies on modified SCR catalyst and the relevant experimental methods were proposed.

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    Measurement and analysis of influence effect of high-tech industry development on industrial pollution based on PLS method
    ZHANG Leqin,CHEN Suping
    Journal of Environmental Engineering Technology    2018, 8 (5): 563-570.   doi: 10.3969/j.issn.1674-991X.2018.05.075
    Abstract272)   HTML1)    PDF(pc) (886KB)(216)      

    Taking Anhui Province as an example, the entropy weighting method was used to evaluate the industrial pollution situation. Based on STIRPAT model, the typical correlation and partial least squares regression analysis methods were adopted to investigate the influence effect of industrial pollution caused by high-tech industry. The results showed that firstly, the pollution index decreased from 0.537 1 in 2005 to 0.469 3 in 2015 with annual average reduction of 1.34%. Secondly, the driving factors of industrial pollution include high-tech industry development, economic growth, fixed asset investments, urbanization, per capital household consumption level, direct foreign investment, environmental regulation policies, industrial structure and marketization degree. Thirdly, the high-tech industry development, economic growth, urbanization level, per capital household consumption level and the interaction terms of economic development and high-tech industry development make significant inhibitory effects on industrial pollution; with their increase rate of 1%, the industrial pollution index is caused to decrease by 0.087 8%, 0.047 0%, 0.000 9%, 0.027 6% and 0.259 8% respectively. Fourthly, the fixed asset investments, industrial structure, direct foreign investment, marketization degree and environmental regulation have positive driving effects on industrial pollution; when increasing by 1%, the industrial pollution index increases by 0.036 6%, 0.000 2%, 0.271 8%, 0.008 1% and 0.031 8% respectively.

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    Optimization and application of accurate control of ultra-supercritical boiler and SCR parameters for NOx real time value up to the standard
    ZHANG Guangcai,LI Ruipan,ZHU Xuezhi,TAO Ran
    Journal of Environmental Engineering Technology    2018, 8 (6): 586-592.   doi: 10.3969/j.issn.1674-991X.2018.06.078
    Abstract270)   HTML14)    PDF(pc) (895KB)(100)      

    The current environmental policy requires that the NOx emission of power station boilers is qualified by the control hourly average, while the real time value of emissions is not required. In order to further reduce NOx emissions from power station boilers, improve operation stability and maximize the potential of SCR system, the study and optimization of the influence factors on NOx generation and removal of power station boilers was carried out. Thereby the real time values of NOx emission were all up to standard, and the boiler efficiency improved. The phenomenon of short-term over standard was avoided in the changing condition of the boiler load adjustment. It achieved good results in the safety, stability and economy of the system, and greatly reduced the workload of daily operation adjustment.

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    Pollution characteristics and ecological risk assessment of heavy metals in Baiyangdian Lake
    GAO Qiusheng,TIAN Ziqiang,JIAO Lixin,DING Lin,YANG Suwen,HAO Zifeng,CUI Zhidan,JIA Haibin
    Journal of Environmental Engineering Technology    2019, 9 (1): 66-75.   doi: 10.3969/j.issn.1674-991X.2019.01.010
    Abstract268)   HTML12)    PDF(pc) (2661KB)(49)      

    In order to survey the present heavy metals pollution of the main surface water in Xiongan New Area-Baiyangdian, 15 points were set up to study the distribution characteristics of heavy metals concentrations in surface water and sediment of Baiyangdian Lake, and the pollution degree of surface water and sediment of the lake was assessed by the methods of comprehensive pollution index, index of geo-accumulation and potential ecological risk index. The changes of heavy metal concentration and potential ecological risk index from 2004 to 2016 were also analyzed. The results showed that the concentrations of heavy metals Cr, Ni, Cu, Zn, As, Cd and Pb in water were 2.38, 6.56, 5.57, 67.17, 4.13, 0.034, 0.39 μg/L, respectively. Among them, Cu and Zn at the Shaochedian site, and Zn at Zhainan, Luowangdian, Quantou, Zaolinzhuang, Guangdianzhangzhuang, Guolikou and Anxin Bridge sites exceeded Class Ⅰ of Surface Water Environmental Quality Standard (GB 3838-2002). Other sites were better than Class Ⅰ water quality standards, Cr, As, Cd and Pb were better than Class Ⅰ water quality standards in all points. The concentrations of heavy metals Cr, Ni, Cu, Zn, As, Cd and Pb in sediment were 48.53, 25.51, 28.83, 91.19, 161.51, 3.21, 45.26 mg/kg, respectively. Cr and Ni were better than Class Ⅰ of Soil Environmental Quality Standard (GB 15618-1995) in all points, while Cu, Zn and Pb were better than Class Ⅱ standards in all points. As and Cd were both significantly higher than Class Ⅲ standards in all points. The comprehensive pollution index showed that there was no heavy metals pollution in Baiyangdian surface water, while the accumulation index and potential ecological risk index indicated that Cd pollution in Baiyangdian sediments was extremely serious and As was also seriously polluted, which should be paid enough attention to. The concentrations of As, Cd and Pb significantly increased from 2003 to 2014, and Cd contributed more than 83% to the historical heavy metal potential ecological risk index, especially, being the main pollution factor. Therefore, the control of Cd pollution into the lake and sediment should be strengthened.

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    Heavy metal pollution and ecological risk assessment of arable land soil in Haigou small watershed
    JU Tienan,WU Xiao,SHI Huading,GAO Fengjie,LI Xinzhe,WANG Yuyao,LUAN Tian,FAN Ping
    Journal of Environmental Engineering Technology    2018, 8 (5): 556-562.   doi: 10.3969/j.issn.1674-991X.2018.05.074
    Abstract264)   HTML1)    PDF(pc) (2346KB)(230)      

    In order to understand the current situation of heavy metal pollution in the arable land of the Haigou small watershed, 106 samples of the surface soil of the arable land were collected in the small watershed, and the inverse distance weighting interpolation method and the Hakanson potential ecological risk index method were used to analyze the distribution of Cd, Pb, Hg, Cu and As in the arable land, in combination with the RS image interpretation and the ArcGIS land statistics method. The results showed that the average contents of heavy metals Cd, Pb, Hg, Cu and As were 0.307, 23.422, 0.041, 21.544 and 12.235 mg∕kg respectively, which were all higher than the background values of Heilongjiang Province. Compared with Soil Environmental Quality Standard (GB 15618-1995), the content of Cd exceeds Class Ⅱ standard, and that of other heavy metals meets Class Ⅰ standard. In terms of the spatial distribution of heavy metals, it was found that the change of As content gradually decreased from east to west, and the change of Cd content was opposite to that of As, which gradually decreased from east to west. The potential ecological risk of the arable land was evaluated by the Hakanson potential ecological risk index method. The results showed that the ecological risk grades of Cd and Hg in the arable land of the Haigou small watershed were relatively high and medium, while that of Pb, Cu and As were mild. Therefore, the potential ecological risk of the farmland in the Haigou small watershed was generally in the middle.

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    Exploration on planning of ecological civilization construction:a case study of Wencheng County in Zhejiang Province
    HAN Lu,LI Mingyue,YAN Xiaohan,BAO Zhuxiang,DUAN Liang
    Journal of Environmental Engineering Technology    2019, 9 (1): 53-60.   doi: 10.3969/j.issn.1674-991X.2019.01.008
    Abstract246)   HTML10)    PDF(pc) (14299KB)(24)      

    In the construction of ecological civilization in China, the basic background and the socioeconomic development level of different regions are obviously different, so it is impossible to copy a model. Precise analysis of the construction of regional ecological civilization is an inevitable choice for the compilation of ecological civilization planning. A general framework for the compilation of ecological civilization planning program suitable for local characteristics were put forward. Taking Wencheng County as an example, and focusing on its natural resources and ecological environment advantages, the restrictive indicators of spatial pattern, industrial development, environmental quality and livable life in the construction of ecological civilization in the county were analyzed. An index system for the planning of ecological civilization construction in Wencheng County was set up according to related national requirements. Aiming at the restrictive indicators, a series of tasks and measures were put forward, such as optimizing ecological spatial patterns, accelerating the development of eco-industry, improving the quality of ecological environment, and strengthening system, culture and life construction. Finally, the expected implementation benefits and achievability of planning objectives were analyzed.

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    Phosphorus forms and potential release characteristics of phosphogypsum in Tuojiang River basin
    YANG Geng, QIN Yanwen, MA Yingqun, HAN Chaonan, LIU Zhichao, YANG Chenchen
    Journal of Environmental Engineering Technology    2018, 8 (6): 610-616.   doi: 10.3969/j.issn.1674-991X.2018.06.081
    Abstract239)   HTML1)    PDF(pc) (949KB)(161)      

    The phosphorus form and content, release kinetics characteristics of phosphorus and the influence of environmental factors on phosphorus release were investigated from phosphogypsum samples collected in Tuojiang River basin. The results showed that the TP content of phosphogypsum was 3.70 mg/g, and the release of phosphorus was mainly carried out by Ex-P, Org-P and Fe-P. Among them, Ex-P and Fe-P accounted for a large proportion. When the ratio of water to phosphogypsum was 500 ∶1, the phosphorus release reached the maximum value, and the phosphorus release mainly occurred in the first 8 hours. The maximum release rate of phosphorus from phosphogypsum was 3.52 mg/(g ·h). The first order kinetic equation can fit the phosphorus release kinetic process well with the maximum release Qmax of 2.30 mg/g under the experimental condition. The pH had significant effect on phosphorus release from phosphogypsum, and either acidic or alkaline water environment was conducive to release of phosphate. Higher salinity and temperature were favorable to the release of phosphorus, and total phosphorus release increased the most as temperature increasing from 10 to 25 ℃ with the maximum at 25 ℃.

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    Journal of Environmental Engineering Technology    2018, 8 (6): 593-594.  
    Abstract237)   HTML14)    PDF(pc) (9667KB)(330)      
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    The pilot study of harmless disposing equipment of diseased dead animals
    LIU Yunpeng, HOU Jiaqi, LI Baoqian, LI Mingxiao, CAO Jinzhong, ZHANG Runkai, WU Gaofeng
    Journal of Environmental Engineering Technology    2018, 8 (6): 662-670.   doi: 10.3969/j.issn.1674-991X.2018.06.088
    Abstract236)   HTML2)    PDF(pc) (15330KB)(168)      

    During the harmless disposal of diseased dead animal, the secondary pollution could be generated from the separation of the cutting and mixing processes. Aiming at this problem, in combination with the characteristics of the shredder and the feed mixer, a kind of cutting blade that could simultaneously complete the functions of cutting and mixing was designed. By analyzing the cutting principle, the cutting-line was deviated from the rotation center to achieve the “sliding cut” effect. The blade was designed with circular arc to improve the distribution of stress, and the blade length was increased to make the cutting more stable. The optimal mixing angle between the switch plate and the cutting blade was determined to be 70° by single factor experiment. The equipment adopts the indirect heating heat transfer oil, which has the advantages of high stability and good heat transfer. Through the theoretical calculation, the motor power of the equipment was selected at 3 kW, with the rated speed of 1 440 r/min. The helical gear reducer was selected for reducer with the speed ratio of 1 000. The pilot test showed that the blade could basically complete the function of cutting and mixing. It needed about 20 h to heat up the material and main the temperature at over 90 ℃, while the temperature fluctuation was obvious within 10-20 h. The test result of pestivirus suis, etc. for the disposed products were all negative, showing that harmless disposal had been achieved. The moisture content of the product is 23%, with pH 5.7, seed germination rate 80%, total nitrogen 3.1% and total phosphorus 2.1%, all achieving the requirement of Organic Fertilizer Standard (NY 525-2012).

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    Spatial distribution and pollution assessment of heavy metals in Minjiang River mainstream
    QIAO Fei, SHI Yao, QIN Yanwen, MA Yingqun, LIU Zhichao, YANG Chenchen
    Journal of Environmental Engineering Technology    2018, 8 (6): 602-609.   doi: 10.3969/j.issn.1674-991X.2018.06.080
    Abstract234)   HTML3)    PDF(pc) (1758KB)(260)      

    In order to explore the pollution level of heavy metals in Minjiang River mainstream, the contents and spatial distribution of As, Cd, Cr, Cu, Pb and Zn in surface water, suspended solids and surface sediments were analyzed. The integrated pollution index and geoaccumulation index were used to evaluate the contamination degree of heavy metals in surface water and surface sediments respectively. The results indicated that the contents of the heavy metals in surface water were below Grade I standard of Environmental Quality Standards for Surface Water (GB 3838-2002). The contents of the 6 heavy metals in suspended solids exceeded the average contents of the stream sediments in China. Similar patterns of spatial distribution in suspended solids were observed for As, Cr and Pb, with the highest contents both at the middle and lower reaches. The contents of Cd and Pb in surface sediments exceeded the average contents of the stream sediments in China. Similar patterns of spatial distribution in surface sediments were observed for Cr and Cu, with the highest contents at the downstream in Yibin section. The contents of Cd in suspended solids and surface sediments were the highest, being 2.99 mg/kg and 39.94 mg/kg respectively, which were 23.00 and 307.23 times the average contents of the stream sediments in China. The integrated pollution index assessment showed that the water quality of surface water was good in Minjiang River mainstream, and the geoaccumulation index assessment showed that Cd was the major pollution element in surface sediments.

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    Application progress of microbial agents in water remediation
    TANG Wei,ZHANG Yuan,WANG Shuping,DING Sen,QIAN Chang
    Journal of Environmental Engineering Technology    2019, 9 (2): 151-158.   doi: 10.12153/j.issn.1674-991X.2018.11.050
    Abstract234)   HTML24)    PDF(pc) (998KB)(138)      

    The use of microbial agents for bioremediation of polluted water has the characteristics of cost-effectiveness, low energy consumption and no secondary pollution. In recent years, great progress has been made in the research and application of microbial agents in water remediation, which has become one of the research hotspots of water bioremediation technology. Through literature search and patent statistics, the research and application status of microbial agents at home and abroad were analyzed. The principle of microbial agents in water remediation and the removal of nitrogen, phosphorus, heavy metals and refractory organics in water were reviewed. The preparation process of microbial agents was briefly introduced, and the application of microbial agents in the repair of black and odorous water bodies, aquaculture water bodies and micro-polluted water sources was summarized. Finally, the problems of microbial agents in water remediation were analyzed, and their development prospects forecasted.

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    Characteristics of waste hair biochar and its adsorption to Ni(Ⅱ) and Zn(Ⅱ)
    XIE Weixue, LIU Xiaomin, LI Xiaodong, JIAO Yongxia, ZHAO Youcai
    Journal of Environmental Engineering Technology    2018, 8 (6): 656-662.   doi: 10.3969/j.issn.1674-991X.2018.06.087
    Abstract232)   HTML6)    PDF(pc) (3884KB)(186)      

    The properties of biochar prepared from waste hair were analyzed by element composition and SEM, and the adsorption ability to heavy metals from domestic wastewater observed.The adsorption kinetics processes of Ni(Ⅱ) and Zn(Ⅱ)were fitted by Lagergren model, and the adsorption isotherm of Ni(Ⅱ) and Zn(Ⅱ) fitted by Langmuir and Freundlich models to investigate the adsorption characteristics of biochar on heavy metals Ni(Ⅱ) and Zn(Ⅱ) in water. The results showed that the carbon content of biochar was high, being alkaline, and the surface structure had porosity with strong adsorption ability. At carbonization temperatures of 300 and 350 °C, the actual maximum equilibrium adsorption for Ni(Ⅱ) was 5.48 and 6.25 mg/g, and the actual maximum equilibrium adsorption for Zn(Ⅱ) was 3.02 and 3.78 mg/g, respectively. The Lagergren model can well describe the adsorption process of Ni(Ⅱ) and Zn(Ⅱ), mainly with chemical adsorption; and the higher the carbonization temperature, the faster the adsorption rate. Langmuir and Freundlich model fitting curves can better describe the isothermal adsorption of Ni(Ⅱ) and Zn(Ⅱ); and the higher the adsorption temperature, the more the adsorption capacity. At the temperature of 20,30 and 40 ℃, the saturated adsorbents of Ni(Ⅱ) were 5.59,7.16 and 7.23 mg/g, and the saturated adsorbents of Zn(Ⅱ) were 1.28,1.29 and 1.32 mg/g, respectively.

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    Adsorption of Zn(Ⅱ) from wastewater by sulfhydryl rice husk carbon
    CHENG Deyi,DU Chao,HUANG Zhaoqin,DAI Jingyu,DU Qiwen,SHAO Aiyun
    Journal of Environmental Engineering Technology    2018, 8 (5): 519-526.   doi: 10.3969/j.issn.1674-991X.2018.05.068
    Abstract221)   HTML1)    PDF(pc) (1413KB)(238)      

    Removal of zinc ions from the wastewater by mercapto acetic acid modified rice husk carbon was studied. The effects of pH, reaction temperature and time, and desorption on the adsorption effect of thiol based rice husk carbon were studied. Scanning electron microscopy and X ray energy spectrum analysis of modified materials were carried out. The results showed that the surface of modified rice husk carbon was more smooth and porous, and the surface functional group —SH content increased by the chemical modification to rice husk carbon, and the adsorption capacity of Zn(Ⅱ) was improved. The modified rice husk carbon has a wide range of pH (6-8), and the adsorption equilibrium is reached at 300 min at 25 ℃. The adsorption process conforms to the pseudo two kinetic equation and is an endothermic reaction. According to the activation energy calculation by Arrhenius empirical equation, the adsorption belongs to active chemical adsorption. Based on the Langmuir adsorption isotherm equation, the theoretical saturated adsorption capacity of the thiol rice husk carbon to Zn(Ⅱ) is 11.26 mg∕g. When combined with desorption, it is known that the adsorbent has good immobilization on Zn(Ⅱ) and has certain adsorption effect.

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    Experimental study on ozone denitration of a biomass circulating fluidized bed boiler
    ZHANG Jianping,WAN Kaidi,WANG Rongtao,XU Chaoqun,JIA Weiwei,WANG Zhihua
    Journal of Environmental Engineering Technology    2019, 9 (1): 8-13.   doi: 10.3969/j.issn.1674-991X.2019.01.002
    Abstract218)   HTML47)    PDF(pc) (941KB)(54)      

    In order to reveal the characteristics of reactive molecular ozone denitrification in biomass boilers, a flue gas ozone denitrification test was carried out on a biomass circulating fluidized bed (CFB) boiler using reactive molecular ozone ultra-low emission technology. A flue gas analyzer was used to measure the flue gas components at the positions before the injection of reactive molecular ozone and at the top of the chimney. The emission characteristics of flue gas pollutants before and after denitrification and the effect of ozone dosage on denitration were investigated. The results showed that the boiler load and the initial concentrations of pollutants such as CO and NOx fluctuated due to the strong random variation of moisture and calorific value of the biomass fuel. The averaged initial concentration of NOx in the flue gas was 146 mg/m3, while the highest value was 480 mg/m3. The instantaneous concentration of NOx had a very strong linear correlation with the oxygen content with the regression coefficient R2=0.96. With the increase of ozone dosage, the denitration efficiency increased from 24% at the ozone generator power level of 118 kW to 95% at 250 kW. After the application of reactive molecular ozone denitration technology, the NOx concentration in the flue gas stayed below 15 mg/m3 with the ozone generator power level of 250 kW, meeting the ultra-low emission standard.

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    Economic policies of plastic bag reduction of foreign countries and regions and its enlightenment to China
    ZHANG Jiaxu,DENG Yixiang,ZHANG Chenglong
    Journal of Environmental Engineering Technology    2018, 8 (6): 642-650.   doi: 10.3969/j.issn.1674-991X.2018.06.085
    Abstract217)   HTML29)    PDF(pc) (549KB)(158)      

    Based on the analysis of the characteristics of the plastic bag management policies in China mainland, the effectiveness and existing problems were summarized. The environmental economic policies of plastic bags enacted by some countries and regions were classified in terms of price leverage and tax leverage, on the basis of the analysis of development history, policy content and management methods. Two suggestions to improve the plastic bag economic policies were put forward borrowing the successful experience in the above countries and regions. Firstly, the current plastic bag charging system should be improved by expanding management scope and setting low bound of the charging prices, et al. Secondly, the taxation system should be established for the plastic bag management, including implementing taxation for specific use only and setting reasonable tax rates, et al.

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    Research advances in Low-Level Jets theory and their impact on air pollutant transmission
    XIAO Zhisheng,MENG Fan,XU Jun,HE Youjiang,ZHAO Yuxi,YU Yang,ZHANG Boya
    Journal of Environmental Engineering Technology    2019, 9 (2): 111-118.   doi: 10.12153/j.issn.1674-991X.2018.11.200
    Abstract210)   HTML30)    PDF(pc) (1165KB)(98)      

    Low-Level Jet (LLJ) is a weather phenomenon closely related to air pollution and other phenomena. The definitions of low-altitude jets, daily variation characteristics, seasonal variation characteristics, and the formation and development mechanisms of low-altitude jets including inertial oscillation theory, thermal and dynamic effects of terrain, and forcing of weather systems were summarized. The research results of numerical simulation of low-level jets developed at home and abroad and their influence on the transport and diffusion of pollutants discharged from atmospheric pollution sources were summarized. It was suggested that the next step should be to develop the low-altitude jet selection criteria and perform the cross-disciplinary study with air pollution discipline, and to carry out researches on the parameterization scheme and small-scale studies suitable for the numerical simulation of low-level jet in the region.

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    Study on prediction of total nitrogen removal effect of a surface water purification device based on BP neural network
    LI Chunhua, HU Wen, YE Chun, LI Jinze, WEI Weiwei
    Journal of Environmental Engineering Technology    2018, 8 (6): 651-655.   doi: 10.3969/j.issn.1674-991X.2018.06.086
    Abstract203)   HTML3)    PDF(pc) (916KB)(168)      

    A back propagation (BP) artificial neural network model was set up to predict the effect of nitrogen removal using a surface water purification device. The observed data of water quality parameters were used as study sample, and the raw water TN, ammonium nitrogen, nitrate nitrogen, CODMn and operation time of the device selected as projection parameter in this model. Besides, the multivariate linear regression model was introduced to compare with BP neural network. The results showed that the coefficient of determination of BP artificial neural network model was 0.985, which stayed at a high level. And the maximum error was 5.92%. Obviously, BP artificial neural network model was more precise, faster and better than multivariate linear regression model. It could accurately predict the removal effect of TN by purification device.

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    The convention implementation of PFOSF/PFOS production industry based on cleaner production
    ZHANG Xin, LI Yanping, QIAO Qi
    Journal of Environmental Engineering Technology    2018, 8 (6): 679-685.   doi: 10.3969/j.issn.1674-991X.2018.06.090
    Abstract199)   HTML2)    PDF(pc) (1065KB)(159)      

    Perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonyl fluoride (PFOSF) were listed in Stockholm Convention as the newly-controlled persistent organic pollutants (POPs). As one of the member countries of this convention, China is currently the main country producing PFOS and is actively responding to PFOS reductions. There are many types of PFOS products, which are widely used in industry, lack of substitutes, so it is difficult to control PFOS industry. Therefore, how to implement the control of PFOS production industry is the key to achieve the source reduction of the PFOS performance target. By investigating the current situation of PFOS/PFOSF production industry and identifying the key nodes of PFOS production and emission, the cleaner production management system of PFOS production industry was analyzed. Two aspects of the development of the cleaner production technology were put forward, including the development of related product substitutes in PFOS production industry and the promotion of the cleaner production level in the existing industry. The cleaner production policy means to achieve PFOSF/PFOS performance targets was also proposed.

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    Discussion on environmental risk analysis and management countermeasures of waste power batteries recovery in China
    WANG Yibo,GUO Yuwen,SUN Zhi,RUAN Jiuli,ZHANG Jianqiang
    Journal of Environmental Engineering Technology    2019, 9 (2): 207-212.   doi: 10.12153/j.issn.1674-991X.2018.10.090
    Abstract196)   HTML16)    PDF(pc) (1122KB)(69)      

    With the vigorous promotion and use of new energy automobiles, a large number of waste power batteries will be produced. The potential environmental risks in the recycling process are both related to the battery’s own materials, and impacted by the amount of waste, metal regeneration technology, pollution prevention measures and so on. The electrolyte components, the potential environmental risks and potential health risks of batteries during recycling, transportation and storage were analyzed, and the secondary pollution risks of pretreatment and metal regeneration processes also discussed. At the same time, using the market supply A model, it was predicted that China’s waste power battery production will surge in the future. Based on the environmental risks brought by large number of waste power batteries, environmental management suggestions were proposed from several aspects, including accelerating the construction of the recycling system of waste power batteries, strengthening the precise management of key nodes for production and discharge, setting pollution prevention standards, etc.

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    Characteristics of nitrogen and phosphorus discharge of main industrial parks in Chongqing in Three Gorges Reservoir Area
    CAO Wei, QIN Yanwen, MA Yingqun, YANG Chenchen, LIU Zhichao
    Journal of Environmental Engineering Technology    2018, 8 (6): 617-626.   doi: 10.3969/j.issn.1674-991X.2018.06.082
    Abstract185)   HTML3)    PDF(pc) (2543KB)(194)      

    In order to clarify the sewage discharge status of key industrial parks in the Three Gorges Reservoir Area, with Changshou chemical park, Fuling industrial Park and Wanzhou industrial park as the key research objects, a total of 48 water samples were collected and analyzed from the drainage channels of sewage treatment plants, the main sewage outlets, the streams into the reservoir and the mainstream of the Yangtze River. The results showed that the concentrations of $NH^{+}_{4}$-N, TN and TP in the water of the drainage channels of sewage treatment plants were 2.58, 13.91 and 0.43 mg/L, the concentrations of $NH^{+}_{4}$-N, TN and TP in the water of main sewage outlets were 18.88, 29.38 and 4.42 mg/L, the concentrations of $NH^{+}_{4}$-N, TN and TP in the water of the stream into the reservoir were 5.48, 12.89 and 0.78 mg/L, the concentrations of $NH^{+}_{4}$-N, TN and TP in the water of the main stream were 0.32, 5.12 and 0.22 mg/L, respectively. The nitrogen and phosphorus concentrations of the main sewage outlets and the stream into the reservoir were 1.93-59.59 times higher than that of Yangtze River main stream water body, which showed that the nutrient salt input characteristics were remarkable to the water quality of the reservoir area. It was suggested that Chongqing City should plan the construction of industrial parks reasonably, control the discharge of industrial wastewater of different industries strictly, reduce the total amount of pollutants entering the river, and reduce the water environment risk in the reservoir area.

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    Performance evaluation of cleaner production audit in electrolytic manganese industry
    HAN Guimei, ZHOU Changbo, WANG Fan, LIU Jingjun, ZHAO Zhiyuan, LI Xuhua, GUO Yajing, YUAN Yin
    Journal of Environmental Engineering Technology    2018, 8 (6): 686-694.   doi: 10.3969/j.issn.1674-991X.2018.06.091
    Abstract183)   HTML3)    PDF(pc) (34635KB)(143)      

    The development of the electrolytic manganese industry in China and the progress of its cleaner production audit were introduced. Through several rounds of cleaner production audit in the electrolytic manganese industry, the major environmental pollution problems in the electrolytic manganese industry were diagnosed. The standardized management system was established in the industry, the development of cleaner production technologies promoted, and the environmental benefits and economic benefits of typical medium and high fee options analyzed. Combined with the cleaner production evaluation index system of the electrolytic manganese industry, the variation of key cleaner production indexes such as the replacement of toxic and hazardous substances, comprehensive energy consumption and current efficiency in the industry from 2009 to 2017 was analyzed. The results showed that the comprehensive energy consumption had decreased from 8 600 kW ·h/t (in Mn) in 2009 to 6 900 kW ·h/t currently, and the current efficiency had shown an overall upward trend. For a company that had undergone multiple rounds of cleaner production audit, five evaluation indexes such as electrolytic cell, stripping method, DC power consumption, harmless treatment of manganese slag, and synthesis utilization rate and water-soluble manganese content (dry basis) in manganese slag reached the domestic advanced level, and played a leading role in energy conservation and emission reduction of the industry.

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    Analysis on source control of health risk in planning environmental impact assessment
    WANG Hongmei,HE Lei,SHEN Peng,HUANG Xiang,CHEN Chen,ZHAO Ci,LIU Xiaoyu,LÜ Shihai
    Journal of Environmental Engineering Technology    2019, 9 (1): 61-65.   doi: 10.3969/j.issn.1674-991X.2019.01.009
    Abstract170)   HTML10)    PDF(pc) (854KB)(92)      

    Planning environmental impact assessment (PEIA) has been one of the most important source control measures to prevent the environmental risk. However, the current practice of PEIA lacks the health risk assessment index system, and thus weaks its integrity and effectiveness greatly. Compared to the traditional four-step health risk assessment procedure, environmental planning health risk assessment (EPHRA) has more implications, which not only interacts with the environmental planning, but also owns systematic, contextual, and reverse restriction to the environmental planning. The core objective of EPHRA is to design greener, and more environmentally friendly and reasonable industrial structures and systems through scientific and systemic environmental health impact assessment. Based on the core index of health risk tolerance, it aims at providing suitable guide to the health protection by adjusting the spatial layout and the emission limitation for the risk sources through the scenario analysis of health benefit and loss and the projection of industrial development. To make up the “gap” of health index missing of EPHRA, itwas suggested that EPHRA technique should be developed as soon as possible, and EPHRA technical guidelines and specifications be promoted, so as to ensure the effective practice of the mandatory health constraints on PEIA.

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