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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
    Abstract448)   HTML14)    PDF(pc) (3017KB)(53)      

    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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    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
    Abstract441)   HTML4)    PDF(pc) (969KB)(193)      

    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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    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
    Abstract413)   HTML43)    PDF(pc) (931KB)(175)      

    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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    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
    Abstract378)   HTML6)    PDF(pc) (950KB)(249)      

    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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    Verification of national subjective and objective air quality forecast in 2018 by TS score
    ZHANG Tianhang,CHI Qianyuan,RAO Xiaoqin,WANG Jikang,ZHANG Bihui,XU Ran,JIANG Qi,LUAN Tian
    Journal of Environmental Engineering Technology    2019, 9 (3): 213-222.   doi: 10.12153/j.issn.1674-991X.2019.03.080
    Abstract364)   HTML42)    PDF(pc) (6639KB)(67)      

    Until now, few works have reported comparison results between subjective and objective air quality forecast. To understand the performances of national subjective and objective air quality forecast, operational results in 2018 from National Meteorological Center were verified by threat score (TS) method. The results showed that TS score, false alarm ratio and missed alarm ratio of subjective (objective) forecast for mild and above pollution all over China in 2018 were 0.23-0.34 (0.24-0.26), 0.37-0.43 (0.39-0.41) and 0.58-0.72 (0.68-0.71), respectively. This illustrated that subjective forecast was better than objective one, but the ability of objective forecast was close to subjective forecast. Performances of subjective and objective forecast were both better in regions with heavier pollution (Jing-Jin-Ji, Fenwei Plain, Central China and Yangtze River Delta) than in lower pollution ones (Northwestern China, Southwestern China, Pearl River Delta and Northeastern China), and so did it in the heavily polluted winter than in the clean summer. With the extension of forecast time, TS scores of subjective forecast showed a downward trend, but scores of objective forecast did not change too much. In winter with heavy pollution, TS scores of 48 and 72 hours' objective forecast were higher than those of subjective forecast. Additionally, in 5 haze processes in 2018, TS scores of subjective (objective) forecast for mild, moderate and severer pollution all over China were 0.39-0.57 (0.43-0.46), 0.22-0.46 (0.25-0.30) and 0.10-0.34 (0.10-0.18), respectively. The situation of TS scores of subjective forecast higher than objective forecast accounted for 3 times in 5 processes. But performance of objective forecast was more stable with extension of forecast time, which illustrated that objective forecast could provide stable reference to forecasters in pollution process, but its ability in dealing with high pollution needs to be improved.

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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
    Abstract352)   HTML14)    PDF(pc) (2661KB)(69)      

    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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    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
    Abstract322)   HTML10)    PDF(pc) (14299KB)(37)      

    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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    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
    Abstract307)   HTML14)    PDF(pc) (895KB)(102)      

    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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    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
    Abstract304)   HTML3)    PDF(pc) (848KB)(86)      

    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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    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
    Abstract297)   HTML1)    PDF(pc) (949KB)(201)      

    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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    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
    Abstract290)   HTML26)    PDF(pc) (998KB)(181)      

    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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    Journal of Environmental Engineering Technology    2018, 8 (6): 593-594.  
    Abstract288)   HTML14)    PDF(pc) (9667KB)(380)      
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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
    Abstract288)   HTML4)    PDF(pc) (2729KB)(265)      

    “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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    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
    Abstract262)   HTML2)    PDF(pc) (15330KB)(178)      

    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
    Abstract262)   HTML3)    PDF(pc) (1758KB)(296)      

    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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    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
    Abstract256)   HTML6)    PDF(pc) (3884KB)(201)      

    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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    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
    Abstract250)   HTML30)    PDF(pc) (1165KB)(127)      

    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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    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
    Abstract246)   HTML11)    PDF(pc) (854KB)(121)      

    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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    Progress of cohort studies in the field of environment and health
    SONG Huan,ZHU Yunjie,XU Qiujin
    Journal of Environmental Engineering Technology    2019, 9 (3): 331-334.   doi: 10.12153/j.issn.1674-991X.2019.01.290
    Abstract245)   HTML19)    PDF(pc) (751KB)(51)      

    Environment and health issues are important factors that affect human health and social development, and are also an important environmental protection work currently in China. Considering the unique advantages of cohort study in causality judgments and the increasingly prominent reality of environment-related health problems, the application and development of cohort studies in the field of environment and health were reviewed, the main contents of cohort study in the field of environment and health described, and the necessity of further cohort study put forward. Meanwhile, the opportunities and challenges of the large-scale cohort study on environment and health in China were also analyzed, so as to provide a diversified perspective and a more reasonable analytical framework for the application of cohort study in the field of environment and health.

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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
    Abstract241)   HTML17)    PDF(pc) (1122KB)(112)      

    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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    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
    Abstract239)   HTML3)    PDF(pc) (34635KB)(155)      

    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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    FTA-based safety evaluation and prevention of dam break and tailings leakage in tailings reservoir
    ZHANG Jiarong,LIU Jianlin
    Journal of Environmental Engineering Technology    2019, 9 (2): 201-206.   doi: 10.12153/j.issn.1674-991X.2018.10.190
    Abstract239)   HTML3)    PDF(pc) (1723KB)(92)      

    The hazards, safety evaluation methods and preventive measures of tailings reservoir were systematically studied. The fault tree analysis (FTA) of a tailings reservoir was performed. The results showed that the ways and causes of the tailings reservoir failure and tailings leakage were various, with 17 and 12 ways, respectively. Close attention should be paid to these ways in the actual production process and great efforts made to investigate them and strengthen the pre-control. According to the different conditions that may appear in tailings reservoir, scientific and reasonable countermeasures should be put forward, and pre-control strengthened, which could greatly reduce the losses caused by tailings reservoir dam failure and tailings reservoir leakage.

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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
    Abstract238)   HTML47)    PDF(pc) (941KB)(80)      

    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
    Abstract238)   HTML29)    PDF(pc) (549KB)(170)      

    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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    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
    Abstract233)   HTML7)    PDF(pc) (916KB)(183)      

    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
    Abstract223)   HTML2)    PDF(pc) (1065KB)(174)      

    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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    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
    Abstract221)   HTML3)    PDF(pc) (2543KB)(212)      

    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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    Analysis of atmospheric circulation situation and allocation characteristics of heavily polluted weather in Langfang City
    ZHANG Weizhong,YAN Lixia,GUO Liping,QIN Yunmiao,SHAN Kun,WEN Jing
    Journal of Environmental Engineering Technology    2019, 9 (4): 335-341.   doi: 10.12153/j.issn.1674-991X.2019.01.241
    Abstract213)   HTML17)    PDF(pc) (1899KB)(69)      

    The characteristics of surface weather pattern and high-altitude circulation pattern of heavily polluted weather at 08:00 were studied by using the data from 2013 to 2015 in Langfang City, and the configuration of high and low-altitude atmospheric circulation analyzed. The results showed that there were 8 types of surface weather circulation patterns, among which the bottom of high pressure accounted for the most, and the rear of high pressure, deformed high pressure and the front of high pressure appeared more. Whenever slight or severe haze occurred, the most surface weather circulation pattern was the bottom of high pressure, the backflow situation appeared the most in mild haze, while the rear of the high pressure field was the most in moderate haze. There were 7 types of 700 hPa circulation, with the northwest airflow before the ridge taking the largest proportion, followed by straight west airflow and southwest airflow before the trough. The slight haze and severe haze most controlled by the northwest airflow before the ridge, while the mild haze and moderate haze were dominated by the straight west wind. There were 9 types of high and low altitude atmospheric circulation configuration, with three main configuration situations being 700 hPa high-pressure ridge control with ground high-pressure field, 700 hPa straight west wind with ground high-pressure field, and 700 hPa high-air trough with ground high-pressure field. Whenever slight or severe haze occurred, the main configuration type was high-pressure ridge in 700 hPa with high-pressure field on surface. When mild haze and moderate haze occurred, the main configuration type was straight western airflow in 700 hPa with high-pressure field on surface. During 3-5 days of continuous haze process, high pressure bottom accounted for the most on the ground, and the proportion of the high altitude situation of the straight westerly circulation, ridge, high-altitude groove was 36.0%, 35.2% and 28.9%, respectively. The most typical circulation situation of high and low air configuration was controlled by high-pressure ridge at high altitude, and for the ground circulation the most typical situation was the bottom of high pressure.

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    Evaluation of rural domestic wastewater treatment technologies in Lake Erhai Basin
    LI Liang,CAO Xinran,PANG Yan,XU Qiujin,HU Xiaozhen,GUAN Heqing
    Journal of Environmental Engineering Technology    2019, 9 (4): 349-354.   doi: 10.12153/j.issn.1674-991X.2019.01.060
    Abstract213)   HTML14)    PDF(pc) (867KB)(105)      

    The evaluation of water pollution treatment technologies is of great significance to understand the current situation and level of technologies. According to the technical characteristics of rural domestic wastewater treatment in Lake Erhai Basin, a fully quantified technical evaluation index system was established, including 8 indicators in economic benefit, environmental benefit and technical level. Based on expert consultation and analytic hierarchy process, the calculation method of technical benefit evaluation was put forward, and five rural domestic wastewater treatment technologies in Lake Erhai Basin were evaluated, including a whole set of wastewater treatment technology from perimeter of the lake bay, the anaerobic pond and surface flow wetland technology, the FMBR technology for mixed wastewater of living and farming, the integrated technology of living and farming wastewater treatment, the integrated technology of anaerobic pond and soil treatment tank. The results showed that the comprehensive benefit (A) score of the five technologies was 6.11-8.19. The integrated technology of anaerobic pond and soil treatment tank, and the integrated technology of living and farming wastewater treatment were excellent, and the other three technologies were good. As the technologies are applied according to the results of the technology evaluation, the appropriate technologies should be selected according to the results of the itemized evaluation of technical and economic benefits and environmental benefits.

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    Water pollution characteristics and whole process control technologies in preserved fruit industry
    LUO Yuchi,YANG Shewei,ZHANG Peng,ZHAO Ya,LIU Junying
    Journal of Environmental Engineering Technology    2019, 9 (1): 89-95.   doi: 10.3969/j.issn.1674-991X.2019.01.013
    Abstract195)   HTML9)    PDF(pc) (943KB)(43)      

    In terms of specific water pollution problem derived from the processing of preserved fruit in southern China, the origin and characteristics of the wastewater were analyzed, and a systematic study on the technical route, approaches and processes of water saving, waste utilization and wastewater treatment in the industry performed. From a perspective of cleaner production and based on a whole processing control technical route, i.e. “source water saving, intermediate pollutant control, end treatment”, a water saving technology using ultrasonic wave and water recycling was proposed for cleaning fruits and vegetables and desalination and rinse of fruit billet. From a perspective of circular economy, a comprehensive utilization technology by curing-liquid vacuum concentration and ion exchange was proposed for low-salt drink production and crystalloid salt recycling; the waste sugar solution as well as by-product waste were recycled through filtration, clarification and decoloration by this technology. From a perspective of emission reduction, a combined biological and desalination technology was proposed for the treatment of wastewater aiming at its high salt and COD and highly variable water quality. Moreover, cleaner transformation and intensive development suggestions which could help to save water resources, reduce wastewater discharges and promote cleaner production level were proposed to promote the sustainable development of the preserved fruit industry.

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    Pollution characteristics and risk of main metal pollutants in spent FCC catalysts in China
    BIN Denghui,ZHU Xuemei,FU Haihui,HAO Yaqiong,HUANG Qifei,YANG Yanmei,YANG Ziliang
    Journal of Environmental Engineering Technology    2019, 9 (4): 453-459.   doi: 10.12153/j.issn.1674-991X.2019.01.031
    Abstract194)   HTML4)    PDF(pc) (2111KB)(24)      

    The spent fluid catalytic cracking (FCC) catalysts generated from 19 FCC units in different regions of China were collected, the heavy metal contents and leaching concentrations analyzed, and the main metal pollutants, pollution characteristics and potential risks discussed. The results were as follows: The main metal pollutants in spent FCC catalyst were nickel, vanadium, antimony, cobalt and zinc. The total concentration and leaching concentration of main metal pollutants varied great among different facilities. The leaching concentration of nickel, vanadium and antimony were comparatively higher, which were 0.004-3.171, 0.130-39.490, 0.042-8.099 mg/L respectively. The metals leaching concentrations from spent FCC catalyst could meet the criteria to enter the landfills as hazardous waste, whilst the pH in leaching solution was too low to enter hazardous waste landfill which need pretreatment. If a pile of spent FCC catalyst were not environmentally managed but stored on ground for a long period, the antimony would be released, thus endangering the groundwater and leading to certain potential health risk. The nickel had no similar effect.

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    Evaluation and obstacle factors study of water environmental carrying capacity in the Pearl River Delta
    XU Zhiqing,LIU Xueyu,XIAO Shuhu,DUAN Liang,DENG Qiyu,LI Jie
    Journal of Environmental Engineering Technology    2019, 9 (1): 44-52.   doi: 10.3969/j.issn.1674-991X.2019.01.007
    Abstract191)   HTML12)    PDF(pc) (3916KB)(63)      

    To comprehensively understand the development of water environmental carrying capacity in the Pearl River Delta and better promote the construction of ecological civilization, 19 indicators were selected to construct an evaluation index system from the three subsystems of economy, water environment and water resources. Entropy weighting method and obstacle degree model were used to evaluate and analyze the carrying capacity and obstacle factors of nine cities in the Pearl River Delta in 2015. The results showed that the average evaluation index of water environmental carrying capacity was 0.507, and the overall performance was moderate, but the regional differences were significant: Shenzhen, Zhuhai and Guangzhou had the best performance, and Foshan, Dongguan and Jiangmen had relatively low level of carrying capacity. From the analysis of obstacle degree, the freshwater resource per capita was the dominant obstacle factor affecting the water environmental carrying capacity with an obstacle degree of 9.9%, and there were also spatial differences in the obstacle degree of each subsystem in the region. Based on the characteristics of economic development in the Pearl River Delta, corresponding suggestions for improving its water environmental carrying capacity were put forward.

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    Application and problems of catalytic ozonation in advanced treatment of petrochemical wastewater
    LI Yanan,TAN Yu,WU Changyong,LIU Hengming,ZHOU Yuexi
    Journal of Environmental Engineering Technology    2019, 9 (3): 275-281.   doi: 10.12153/j.issn.1674-991X.2019.02.280
    Abstract190)   HTML19)    PDF(pc) (795KB)(74)      

    Biological effluent of petrochemical wastewater treatment plant contains toxic and refractory organic compounds, which is difficult to be furtherly treated by biological process. However, with the implementation of Emission Standard of Pollutants for Petroleum Chemistry Industry (GB 31571-2015) after July 1, 2015, the petrochemical wastewater treatment plants had experienced great centralized technology improvement. Meanwhile, most of the advanced treatment units have been built by ozone/catalytic ozonation process to achieve the discharge standard. At present, most of these advanced treatment units have been in operation for more than two years. With the actual operation, a series of problems which were not taken into account at the beginning of the design have arisen. Due to low ozone utilization rate and continuous deterioration, the treatment costs continuously increased. In order to solve these problems, combined with practical conditions, four aspects of the flocs, colloidal macromolecule organic compounds, ozone mass transfer and catalysts were analyzed. In the meantime, the development trend of ozone catalytic oxidation technology in secondary effluent treatment of petrochemical industry was put forward.

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    Study on removal and desorption capacity of phosphate from water with NiFe-LDHs
    WANG Cheng,XU Qiujin,HU Xiaozhen,YANG Feng,YU Xiaomei
    Journal of Environmental Engineering Technology    2019, 9 (1): 76-81.   doi: 10.3969/j.issn.1674-991X.2019.01.011
    Abstract187)   HTML9)    PDF(pc) (4504KB)(66)      

    The removal and recovery of phosphorus from wastewater in an efficient and cost-effective way are critical for resolving the phosphorus crisis. The ultra-thin NixFe-LDHs nanosheets with different molar ratio of Ni:Fe were fabricated by a co-precipitation method combined with ultrasonic treatment. The Zeta position and crystallinity played an important role in promoting the adsorption of LDH, which were observed in the relationship between the Zeta position, crystallinity and the molar ratio of Ni :Fe. When the molar ratio of Ni :Fe was 2 :1, the amount of phosphate adsorption could reach 248.00 mg/g. The regenerative efficiency of Ni2Fe-LDHs was still up to 59.2% after adsorption and desorption for six cycles through proper regeneration technology.

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    Study on spatial distribution of city-industry layout and assessment of residential safety in Beijing-Tianjin-Hebei region
    LI Yangyang,WANG Zishu,LIU Yi,LI Wangfeng,LI Qian
    Journal of Environmental Engineering Technology    2019, 9 (2): 194-200.   doi: 10.12153/j.issn.1674-991X.2018.09.070
    Abstract182)   HTML20)    PDF(pc) (2736KB)(67)      

    Beijing-Tianjin-Hebei region is a place with high density of population, which makes residential security an important precondition during new urbanization. However, there are significant spatial differences in the level of regional urbanization development. The problems of city-industry mixing and “dispersed, poorly managed and polluted” enterprises are prominent. Urban human settlement environment security is facing severe challenges, and the spatial layout needs to be further optimized. The spatial relationship of city and industry was analyzed through the geographic information system, and at the same time, the sensitivity of human settlement risk with spatial information was assignment by characteristic index. The analysis found that the Beijing-Tianjin area, Beijing-Shijiazhuang line and Tangshan area were the most residential sensitive and most industrial intensive areas in Beijing-Tianjin-Hebei region. In addition to the obvious suburbanization trend of industrial plants in the Beijing-Tianjin region, the population distribution in Tangshan and middle and south area of Hebei Province was highly overlapped with urban boundaries and industrial plant distribution space, and the relationship between industry and city was complicated. Finally, based on the analysis of the relationship between human settlement security and city-industry relationship, some suggestions for urban spatial pattern optimization and human settlement security were put forward.

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    Study on membrane bioreactor-ultra low-pressure selective nanofiltration for municipal wastewater treatment
    ZHANG Hengliang,DUAN Liang,YAO Meicheng,WEI Jian,HUANG Yuhua
    Journal of Environmental Engineering Technology    2019, 9 (1): 21-27.   doi: 10.3969/j.issn.1674-991X.2019.01.004
    Abstract180)   HTML17)    PDF(pc) (2059KB)(114)      

    A pilot-scale experimental device of membrane bioreactor-ultra low-pressure selective nanofiltration (MBR-DF) was constructed to improve the quality of recycled water and the reduction of sludge. The MBR-DF hybrid system was used to treat the municipal sewage and operated in a zero-sludge manner, and a conventional activated sludge process (CAS) was established at the same time. The influent contents of COD, $NH^{+}_{4}$-N, TN and TP were 87.0-165.7, 14.0-31.0, 14.2-32.4, and 2.5-3.3 mg/L, respectively. The results showed that the concentrated water zero-emission MBR-DF system had a good removal effect on COD, $NH^{+}_{4}$-N and $PO_{4}^{3-}$, with the removal rates of 95.7%, 99.0% and 68.5%, respectively. The removal rates of TDS and $HCO^{-}_{3}$ were 13.5% and 31.1% accordingly, and the total hardness of the effluent could be reduced effectively. The DF membrane had a significant retention effect on $PO_{4}^{3-}$ and $SO_{4}^{2-}$, had a poor retention effect on $NO^{-}_{3}$ and had no retention effect on $HCO^{-}_{3}$. After the influent DOM was passed through MBR-DF system, only a small amount of tryptophan-like substances remained. The UV254 reduction rate of the influent DOM was 94.9% and the DOC removal rate was above 98.0% in the MBR-DF system. The degree of conversion of humus to non-humus was higher in the effluent DOM. The removal rates of 17-β estradiol (E2) by MBR-DF system and CAS system were 99.9% and 70.8%, respectively. Therefore, MBR-DF system could effectively reduce the health hazards and ecological threats of effluent in recycling.

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    Research on incineration technology of returning all leachate to incinerator in MSW incineration power plant
    BU Yinkun
    Journal of Environmental Engineering Technology    2019, 9 (3): 302-310.   doi: 10.12153/j.issn.1674-991X.2018.12.120
    Abstract177)   HTML6)    PDF(pc) (1685KB)(47)      

    Landfill leachate from MSW incineration power plant contains a variety of harmful organic compounds and heavy metals. Concentrations of CODCr and BOD5 are much higher than those of urban sewage, with high ammonia nitrogen content and strong stench, and thus thorough harmless treatment must be carried out. The current domestic landfill leachate treatment methods of most of the garbage power plants were biological treatment, physical and chemical treatment or their combined treatment methods. These methods were considered to be too complicated, expensive, and could not treat the contaminants thoroughly. The author traced back the source of landfill leachate. It was found that for a qualified waste incineration power generation boiler which was designed based on the data of combustion calculation and thermodynamic calculation by waste element analysis, the design parameters such as boiler power, efficiency, flue gas temperature could not be affected in theory, only when the leachate belonging to the waste into the furnace was fully misted and evenly sprayed into the furnace for complete incineration. Based on this point of view, the specific process of all leachate incineration was put forward in order to further improve the harmless incineration technology of refuse. The process included full misting of leachate, the number of spray entrances of atomized leachate and their corresponding positions and angles, and the way to automatically track and match the amount of leachate spray with the amount of incineration of reuse in the incineration.

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    PM2.5 prediction model based on weighted KNN-BP neural network
    ZHAO Wenyi,XIA Lisha,GAO Guangkuo,CHENG Li
    Journal of Environmental Engineering Technology    2019, 9 (1): 14-18.   doi: 10.3969/j.issn.1674-991X.2019.01.003
    Abstract176)   HTML25)    PDF(pc) (10180KB)(19)      

    Through the weighted KNN-BP neural network method determined by membership function , the dynamic real-time prediction model of PM2.5 concentration was established. The concentration of six pollutants, i.e. PM2.5, PM10, NO2, CO, O3 and SO2, six meteorological data including weather condition, temperature, pressure, humidity, wind speed and wind direction in the first hour, as well as the days of a week and the hours of the days for projection were regarded as the dimensions of the KNN instance. Three nearest neighbors were selected and, according to the Euclidean distance obtained, the membership weight of each neighbor point variable determined. Finally, the dimension of all nearest neighbor points were taken as the input layer of BP neural network, and the next hour PM2.5 concentration to be predicted as the output layer data. The method avoided the problem that the traditional BP neural network method failed to reflect the influence of the data in the historical window on the current predicting. The data of 2014-05-01 from 00:00 to 23:00 2014-09-10 in Dongcheng District monitoring station in Beijing was tested. The results showed that the prediction model with weighted KNN-BP neural network had the lowest deviation compared with other methods, and the stability showed the best. Therefore, this model is an effective method for the PM2.5 real time prediction.

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    Emission characteristics and impact factors of road fugitive dust in Yanqing District, Beijing City
    WANG Kai,FAN Shoubin,SUN Gaihong,QI Haoyun
    Journal of Environmental Engineering Technology    2019, 9 (1): 1-7.   doi: 10.3969/j.issn.1674-991X.2019.01.001
    Abstract176)   HTML53)    PDF(pc) (7293KB)(56)      

    56 fugitive dust samples from different levels of paved roads in Yanqing District of Beijing City were collected. Based on the collected activity data of vehicle flows, vehicle constitutes and road length, road fugitive dust emission factors and inventories of Yanqing District were developed following the AP-42 methodologies, and its impact factors were analyzed. The results showed that the average dust load were 0.54, 0.56, 0.71, 0.97, 1.35 and 2.55 g/m2 for highways, national roads, provincial roads, prefectural roads, rural and village roads, respectively. The average fugitive dust emission factors of total suspended particulate (TSP), PM10 and PM2.5 were 16.95, 3.25 and 0.78 g/km per vehicle, whose emission inventories were 48 507, 9 311 and 2 255 t/a, respectively. Road shoulders, stable roadsides and favorable road conditions could contribute to a reduction of road fugitive dust emission. Areas with high driving mileage were concentrated in urban areas and main roads, which was almost consistent with the distribution of road fugitive dust density.

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    Effect of A/O+ aluminum sludge filled constructed wetland combined process on rural domestic sewage
    ZHANG Ruibin,XI Daoguo,WANG Leyang,HUANG Jinxin,ZHANG Qiang
    Journal of Environmental Engineering Technology    2019, 9 (2): 145-150.   doi: 10.12153/j.issn.1674-991X.2018.11.270
    Abstract176)   HTML9)    PDF(pc) (1850KB)(68)      

    The aluminum sludge, a by-product of the water supply plant, was used as the filler of the constructed wetland, and A/O+ aluminum sludge filled artificial wetland combination process was adopted to treat the rural domestic sewage. The results showed that the total average removal rates of chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus were 82.33%, 81.58%, 76.22% and 86.50%, respectively, and the effluent quality could reach Level 1A standards of Pollutant Discharge Standard of Urban Sewage Treatment (GB 18918-2002). The removal rate of TP was 50.43% in aluminum sludge filled constructed wetland, significantly higher than that of traditional wetlands. The adsorption of aluminum sludge filler was the main way to remove phosphorus. The combination process of A/O + aluminum sludge filled constructed wetland could effectively improve the efficiency of nitrogen and phosphorus removal, realize the deep treatment of sewage, alleviate the blocking of wetlands, and extend the service life of constructed wetlands.

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