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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
    Abstract456)   HTML15)    PDF(pc) (3017KB)(57)      

    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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    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
    Abstract390)   HTML42)    PDF(pc) (6639KB)(70)      

    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
    Abstract359)   HTML14)    PDF(pc) (2661KB)(72)      

    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
    Abstract326)   HTML10)    PDF(pc) (14299KB)(38)      

    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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    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
    Abstract295)   HTML28)    PDF(pc) (998KB)(195)      

    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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    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
    Abstract260)   HTML19)    PDF(pc) (751KB)(55)      

    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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    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
    Abstract257)   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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    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
    Abstract250)   HTML4)    PDF(pc) (1723KB)(96)      

    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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    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)(132)      

    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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    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
    Abstract246)   HTML49)    PDF(pc) (941KB)(88)      

    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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    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
    Abstract244)   HTML18)    PDF(pc) (1122KB)(127)      

    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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    Ecological protection and restoration system of mountain-river-forest-farmland-lake-grassland: practicing the theory of lucid waters and lush mountains are invaluable assets
    JIANG Xia,WANG Kun,ZHENG Shuofang,HU Xiaozhen,CHU Zhaosheng
    Journal of Environmental Engineering Technology    2019, 9 (5): 475-481.   doi: 10.12153/j.issn.1674-991X.2019.09.020
    Abstract243)   HTML41)    PDF(pc) (1082KB)(184)      

    China is vast in area, but because the population base is huge, the spatial distribution of available land resources is uneven. With the remarkable improvement of the country's economic power and people's living standard, how to realize the sustainable development of the economy and promote the coordinated development of socio-economy and environmental protection under the limited land and resources has become an urgent problem to be solved. The important concept of “mountains, rivers, forests, farmlands and lakes are a community of life” proposed by President Xi Jinping and the idea of systematic governance have pointed out the direction for solving this development problem. The strategic background of ecological protection and restoration of mountain-river-forest-farmland-lake-grassland (MRFFLG) was analyzed and the guiding ideology, basic principles and systematic design ideas of ecological protection and restoration of MRFFLG explained. The key tasks of ecological protection and restoration of MRFFLG were put forward, including the preparation of restoration plan, the scientific determination of spatial distribution, the optimization and adjustment of the resulting structure and population distribution, carrying out ecological restoration according to local conditions, promoting ecological protection and restoration by multi-departments, and clarifying its technical requirements.

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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
    Abstract218)   HTML19)    PDF(pc) (1899KB)(76)      

    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
    Abstract216)   HTML14)    PDF(pc) (867KB)(107)      

    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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    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
    Abstract213)   HTML12)    PDF(pc) (3916KB)(64)      

    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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    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
    Abstract204)   HTML9)    PDF(pc) (943KB)(49)      

    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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    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
    Abstract198)   HTML19)    PDF(pc) (795KB)(75)      

    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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    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
    Abstract197)   HTML4)    PDF(pc) (2111KB)(26)      

    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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    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
    Abstract190)   HTML20)    PDF(pc) (2736KB)(70)      

    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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    Research progresses on remediation of organic contaminated soil by biochar
    WANG Daohan,SHAN Feng,TANG Jiaxi,HE Miaomiao,YING Bo,LIU Ya,LI Yang,WEI Zhongping
    Journal of Environmental Engineering Technology    2019, 9 (4): 460-466.   doi: 10.12153/j.issn.1674-991X.2018.03.090
    Abstract189)   HTML8)    PDF(pc) (900KB)(66)      

    Biochar as a soil amendment to improve soil environment and remediate contaminated soil has become one of the research hotspots in the field of agriculture and environmental protection. The types and characteristics of biochar, the effects of biochar application on soil physical properties (bulk density, porosity, water holding capacity, aggregate stability, etc.) and chemical properties (pH, nutrients, carbon cycle, etc.) were introduced. The adsorption mechanism of biochar for remediation of organic contaminated soil was expounded. The biochar remediation efficiency was analyzed from three aspects, including biochar physical and chemical properties, organic biological properties and adsorption environment. The effects of biochar on the environmental behavior of organic pollutants in soil were discussed, and the existing problems and future research directions were prospected.

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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)(68)      

    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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    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
    Abstract184)   HTML55)    PDF(pc) (7293KB)(59)      

    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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    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
    Abstract183)   HTML6)    PDF(pc) (1685KB)(52)      

    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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    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
    Abstract180)   HTML9)    PDF(pc) (1850KB)(69)      

    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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    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)(115)      

    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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    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
    Abstract178)   HTML26)    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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    Establishment and application of drinking water insurance technology system from water source to tap
    LIN Mingli,QIN Jianming,ZHANG Quanbin
    Journal of Environmental Engineering Technology    2019, 9 (4): 362-367.   doi: 10.12153/j.issn.1674-991X.2019.01.190
    Abstract175)   HTML15)    PDF(pc) (3929KB)(24)      

    In response to problems of water source contamination, water quality security risk, and the difficult removal of poisonous and pernicious substances such as algae, odor, ammonia nitrogen and arsenic, the National Major Science and Technology Program for Water Pollution Control and Treatment in the 11 th and 12 th five-year plan periods developed significant technologies covering water regulation, water quality purification, water distribution system and its monitoring and evaluation, advance warning and emergency treatment, and drinking water security control. On this basis, the drinking water insurance multi-barrier process with ozone-GAC and membrane separation as core technologies has been established, and domestic-produced critical equipment and materials realized. Moreover, the drinking water insurance technology system from water source to tap has been established and applied in Taihu Lake Basin and South-to-North Water Diversion Project benefited regions in large scales, leading to an accumulative water supply scale of over 10 million m 3/d and a benefited population of over 80 million, and providing technical support for improvement of the qualified rate of urban water supply quality from 58.2% in 2009 to 96.0% presently. In the meanwhile, the achievements have provided systematic technical support for national urban-rural water supply planning, urban water supply quality supervision and the construction of water supply emergency rescue bases.

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    Research progress of long-term nitrogen removal in subsurface flow constructed wetlands
    YAN Bingfei,XIAO Shuhu,LIAO Chungang,DENG Qiyu,LI Dan,LIU Xueyu
    Journal of Environmental Engineering Technology    2019, 9 (3): 239-244.   doi: 10.12153/j.issn.1674-991X.2019.02.010
    Abstract171)   HTML19)    PDF(pc) (768KB)(100)      

    Subsurface flow constructed wetlands have the advantages of simple operation, low cost of construction and operation, and good environmental benefits. However, in the long-term operation, the phenomenon of low denitrification efficiency is also common. The mechanism of denitrification in subsurface flow constructed wetland was stated and the main reasons for the decrease of denitrification efficiency in long-term operation were reoxygenation capacity reduction and substrate clogging. Based on extensive literature review, the methods of improving denitrification efficiency by long-term operation of subsurface flow constructed wetlands were summarized. The measures and effects for improving denitrification efficiency were discussed from the aspects of improving reoxygenation capacity of wetland, selecting suitable filler size and gradation, and optimizing subsurface flow wetland process.

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    Study on the spatial-temporal change of vegetation coverage between the belts of Beijing's main urban area based on dynamic remote sensing data
    MA Moheng,XUE Fei,DANG Anrong,LI Xuecao,HU Tengyun
    Journal of Environmental Engineering Technology    2019, 9 (4): 404-413.   doi: 10.12153/j.issn.1674-991X.2019.05.141
    Abstract167)   HTML11)    PDF(pc) (7704KB)(17)      

    Beijing has been undergoing rapid urbanization since 1980s. A tremendous change in vegetation coverage can be observed in main city area (the 6th-Ring Road). Based on the Landsat remote sensing database collected during the periods of August or September in 1984, 1995, 2004 and 2014 respectively, a comprehensive study on radiometric calibration, atmospheric correction, and splicing combined with cutting in the 6th-Ring Road of Beijing was carried out. By using NDVI and other methods, the change of vegetation coverage over the three decades of each ring was obtained. The results indicated that the percentage of internal vegetation coverage decreased from 76.80% (1 742.44 km 2) to 48.73% (1 105.61 km 2) in three decades from 1984. The vegetation coverage in the 2nd-Ring road and to the 3rd-Ring road increased by 8.43 and 4.33 percentage point respectively in 2014 and 1984, however the vegetation coverage outside of the 3rd-Ring decreased growing, which was 12.23, 27.62, 32.97 percentage point respectively. Research conclusion include that it is necessary to propose differentiation ideas on urban ecosystem construction, e.g., vegetation coverage between different zones through spatial planning means. The inner 3rd-Ring Road demands urban fine governance aiming to encourage the development of green space rather than building areas. As the urban construction between the third to the 5th-Ring Road tends to stabilize, more opportunities appear for the expansion of the medium-sized urban ecological space. Moreover, the afforestation of million acres and the increase of urban farmland could be accomplished for 5th-Ring and 6th-Ring Road. Through these planning approaches, it is expected to build a variety of urban green spaces system, and furthermore, comprehensively enhance the urban ecosystem services of Beijing’s main urban area.

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    Study on performance and membrane fouling of MBBR-MBR combined process for treatment of domestic wastewater
    ZHANG Hengliang,DUAN Liang,YAO Meichen,WEI Jian
    Journal of Environmental Engineering Technology    2019, 9 (3): 245-251.   doi: 10.12153/j.issn.1674-991X.2019.01.240
    Abstract166)   HTML16)    PDF(pc) (1650KB)(107)      

    A moving bed biofilm reactor(MBBR)-membrane bioreactor(MBR) combined process was constructed to treat domestic wastewater, and the removal effect of pollutant and membrane fouling were investigated. The results showed that the removal rate of $NH_{4}^{+}$-N and COD could reach 97% by MBBR-MBR. The membrane suction pressure in MBR was characterized by a slow increase and then a rapid increase with the extension of the running time. Extracellular polymeric substances (EPS) and soluble microbial products (SMP) were important factors influencing membrane fouling. Ordinary chemical cleaning did not restore the MBR membrane module to the level of the new, showing irreversibility. The apparent molecular weight distribution of EPS was more extensive, while the apparent molecular weight of SMP exhibited a single peak characteristic. SMP was mainly composed of small molecular weight substances.

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    Catalytic ozonation of penicillin G in aqueous phase using modified natural zeolite supported cerium
    REN Yuezhong,ZHANG Jiawen,WEI Jian,DUAN Liang,XU Dongyao,WANG Jian
    Journal of Environmental Engineering Technology    2019, 9 (1): 28-35.   doi: 10.3969/j.issn.1674-991X.2019.01.005
    Abstract160)   HTML7)    PDF(pc) (7864KB)(22)      

    Cerium-loaded treated nature zeolite (Ce-NZ) was prepared by equal volume impregnation method and was used as a catalyst for the ozonation of Penicillin G (PCN) in aqueous solution.The catalyst was characterized by particle surface area analysis (BET), scanning electron microscopy combined with energy dispersive spectrum (SEM-EDS), transmission electron (TEM) and X-ray diffraction (XRD). Characterizations results suggested that the prepared samples retained the surface structure of natural zeolite and the CeO2 particle was evenly loaded on the surface of zeolite supports. Ce-NZ catalytic ozonation of PCN in water showed that the catalyst had good catalytic activity. Under the conditions of PCN concentration 50 mg/L, ozone dosage 6 mg/min and reaction time 2 h, the mineralization efficiency of 4% Ce-NZ catalyst for PCN catalytic ozonation reached 31%, 22% higher than ozonation reaction alone. The catalytic activity of the samples slowly increased with metal loading amount and the 4% Ce loading amount was chosen as the optimum condition. The initial pH of the solution also had significant effect on the reaction, and the catalytic oxidation removal rate increased with the increasing of pH. The prepared Ce-NZ catalyst had high stability, and no marked difference of catalytic activity was seen after 10 times repeated use.

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    The effects of filamentous sludge bulking on performance and bacterial community structure of pilot-scale denitrification reactor
    XU Zicong,LI Haisong,HU Peiji
    Journal of Environmental Engineering Technology    2019, 9 (2): 139-144.   doi: 10.12153/j.issn.1674-991X.2018.10.300
    Abstract159)   HTML11)    PDF(pc) (2049KB)(72)      

    The effect of filamentous sludge bulking on the performance of a pilot-scale denitrification reactor with effective volume of 10 m 3 and flow rate of 300 m 3/d was investigated. The changes of bacterial community structure were analyzed by high throughput sequencing.When the reactor operated normally for 66 days, sludge bulking phenomenon was observed and sludge sedimentation performance deteriorated significantly; the SV30 rose from 30% to 85%, and the biomass in the reactor decreased, with the mixed liquid suspended solids (MLSS) decreasing from 3 300 mg/L to 1 400 mg/L. The microscopic examination found that a large number of filamentous micro-organisms extended out of the flocs, and the close bacterial micelles were destroyed, which indicated that the sludge bulking was mainly caused by filamentous bacteria. Furthermore, high-throughput sequencing confirmed the filamentous bacteria such as Thiothrix, Leptothrix and Haliscomenobacter were enriched after sludge bulking, and were changed by filamentous bacteria types and environmental factors, indicating that higher sulfide and lower DO may provided better conditions for sludge bulking. It was noted that the denitrification performance of the reactor was not affected by sludge bulking and sludge loss, which may attribute to the increase in abundance of denitrifiers such as Methyloversatilis, Hydrogenophaga and Thiothrix (29.74%, 1.69% and 3.45%, respectively). Besides, the shift of bacterial community structure might cause changes in the abundance of functional genes.

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    Journal of Environmental Engineering Technology    2019, 9 (1): 19-20.  
    Abstract158)   HTML25)    PDF(pc) (9958KB)(55)      
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    Technical framework and application of site-inspection and enforcement for air pollutants from stationary sources
    SUN Caiping , SUN Qihong , WANG Wei , LIU Xiaofu , WANG Ying , LUO Lei , LIU Baiyin , QIU Wenting
    Journal of Environmental Engineering Technology    2019, 9 (6): 741-747.   doi: 10.12153/j.issn.1674-991X.2019.06.170
    Abstract158)   HTML9)    PDF(pc) (2516KB)(30)      

    Waste gas emission has many characteristics such as many outlets, high concentration, miscellaneous species and unstable emissions, and is the main source of air pollution. However, grassroots law enforcement teams generally have problems such as fewer personnel, single inspection methods, and lack of supervision equipment, resulting in low efficiency of stationary source supervision. On the basis of analyzing the supervision effect of traditional law enforcement methods, a new supervision thought which pays more attention to regional supervision and on-site inspection, and implements intensive supervision to promote precise enforcement was put forward. An air-ground integrated, multi-dimensional supervision technical framework system for stationary source air pollutants emission was constructed, and a combination of high-resolution, high-flexibility technologies for different scenes was selected. A demonstration study on the applications of the technologies in the steel industry in Tianjin was carried out. The demonstration results showed that the regulatory technical framework system had good applicability, able to provide multi-scale and comprehensive pollutant emission data sets, and constitute a corporate compliance evaluation matrix, which could provide a strong guarantee for the implementation of accurate enforcement supervision. Limited to the current inconsistency of regulatory regulations and standards, the applications of new technologies need to be promoted by institutions at all levels.

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    Characteristic and evaluation of soil heavy metals pollution in the molybdenum mine area in Shaanxi
    WANG Tao,SI Wantong,OUYANG Yan,LI Haidong,SHEN Weishou
    Journal of Environmental Engineering Technology    2019, 9 (4): 440-446.   doi: 10.12153/j.issn.1674-991X.2019.01.080
    Abstract147)   HTML4)    PDF(pc) (1743KB)(39)      

    Soil samples were collected from different sites in a molybdenum ore area in Shaanxi Province. Method of single factor pollution index, Nemerow index and potential ecological risk index were used for soil pollution evaluation and analysis. The results showed that the concentration of Zn was the highest among all heavy metals around the molybdenum ore district. The variation coefficients of Cu and Zn were 151.75% and 137.85% respectively, which belonged to higher variation. Pollution of Cu was the most serious in the soil, as the serious pollution rate reached 30.00%. Comprehensive potential ecological risk index of soil in the downstream river of mine (Q2) and the open-air ore area (Q4) were 323.84 and 382.24 respectively, which belonged to strong ecological risk, while the ecological risk degree in the surrounding farmland was slight. There existed difference among the potential ecological risk of soil heavy metals in the study area. Among all heavy metals, Cd and Hg had potential ecological risk with extremely high strength. Q2, Q3 and Q4 zones should be a key control area for soil heavy metal pollution prevention and control, and the harmful effects of Cu, Zn, Cd and As should be taken seriously. Therefore, it is necessary to strengthen the ecological environment control of mineral mining and production activities in the future to avoid and reduce the transfer of heavy metal pollution. Meantime, the potential ecological risk of soil heavy metal was controllable in the molybdenum ore area and the surrounding area, and the environmental risk monitoring in key areas should be further strengthened.

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    Ideas and practice of ecological protection and restoration of mountain-river-forest-farmland-lake-grassland system in Lake Fuxian Basin
    NIU Yuan,HU Xiaozhen,WANG Linjie,ZHANG Youlin,YU Hui,CAO Xunyu,HE Yongjun,YIN Jiao,JIANG Xia
    Journal of Environmental Engineering Technology    2019, 9 (5): 482-490.   doi: 10.12153/j.issn.1674-991X.2019.08.010
    Abstract142)   HTML8)    PDF(pc) (2774KB)(60)      

    Lake Fuxian Basin is an important ecological barrier in southwest China and the Pearl River Basin, and an important part of China's “two screens and three belts” ecological security strategic pattern. Its ecological security is of strategic significance to guarantee the ecological security of the Pearl River Basin and the ecological functional services of the Yunnan-Guizhou plateau and even the national soil and water resources security. Based on the concept of “mountains, rivers, forests, farmlands, lakes and grasslands are a community of life”, and aiming at the eco-environmental problems in Lake Fuxian Basin, such as the need of spatial pattern optimization for the lake basin, the serious land degradation, the overloaded pollutants discharge, and the continuously increasing ecological risk, a set of lake basin ecological protection and restoration schemes were proposed. Putting Class Ⅰof Environmental Quality Standards for Surface Water (GB 3838-2002) for high quality water resources as the goal, and basin space pattern optimization and management and control as the premise, the overall comprehensive protection ideas of “repairing mountains and expanding forests, regulating farmlands and saving water, habitat restoration, pollution control and river management, and lake protection management” were proposed. Five kinds of lake basin ecological protection and restoration schemes covering 47 projects were designed, which included water conservation and mine restoration, farmland regulation and water saving, ecological protection and restoration, pollution source control and clean water restoration, and lake conservation and comprehensive management regulation. After more than one year's implementation, the programme had achieved initial success in expanding the area of forest vegetation, improving the quality and efficiency of farmland, reducing the in-lake pollutant loads, enhancing the ecological stability of the basin and improving eco-environment of lakeside region. The next step is to comprehensively strengthen the spatial control of the river basin and comprehensively promote the pilot projects of ecological protection and restoration, so as to restore the healthy ecological function of the lake basin in an all-round way, guarantee the cleanliness of the water body and the ecological security of the basin, and promote the healthy development of the lake basin.

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    DOM distribution characteristics and source analysis of Baitabu River
    YAN Bingfei,PENG Jianfeng,DENG Qiyu,LI Dan,LIU Xueyu,LI Jie
    Journal of Environmental Engineering Technology    2019, 9 (3): 225-232.   doi: 10.12153/j.issn.1674-991X.2019.02.190
    Abstract141)   HTML12)    PDF(pc) (2780KB)(64)      

    The methods of three-dimensional fluorescence spectroscopy and Pearson correlation analysis were applied to determine the pollution characteristics and origins of DOM in a typical urbanized river, Baitabu River in northeastern China. The results indicated that fluorescence peak types of the river included UV fulvic-like peak (A peak), visible fulvic-like peak (C peak), protein-like peak (B peak) and protein-like peak (T peak). The major components order of DOM was protein-like>soluble microbial byproduct-like>fulvic-like>humic-like. The relative content of spatial distribution of DOM showed middle and lower reaches>upper reaches. The source of DOM in Baitabu River showed double characteristics of land-sourced materials and microbial degradation, and the internal pollution caused by microbial degradation could not be ignored. According to Pearson correlation analysis, the DOM concentration was correlation with NH3-N and TP concentration which showed a significant positive relationship, but was significantly negative correlation with dissolved oxygen concentration.

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    Structure characteristics and performance analysis of a novel cyclone-jet bubbling tower
    XIAO Yujun,LI Caiting,LI Shanhong,ZOU Yihui
    Journal of Environmental Engineering Technology    2019, 9 (2): 126-132.   doi: 10.12153/j.issn.1674-991X.2018.12.200
    Abstract140)   HTML6)    PDF(pc) (4189KB)(22)      

    Based on the principles and advantages of jet bubbling reactor and cyclone separator, a novel type of bubbling tower, cyclone-jet bubbling tower, was designed aiming at the disadvantages of traditional bubbling tower which could not be applied to the flue gas contained large dust content. The distribution of gas phase, the separation property of gas-solid and the efficiency of demisting were analyzed by computational fluid dynamics (CFD) technology. The design integral equation of demisting ring was obtained according to the principle of force balance. The results showed that the uniform distribution of flue gas in the entrance cabin area and the separation of gas-solid at the external tower were achieved by the structure of volute cut-in entrance. The removal efficiency of 5-100 μm and 1-10 μm size dust were 99.43% and 53.70%, respectively. The demisting efficiency was improved from 98.39% to 99.08% by the structure of demisting ring. And the critical particle size of droplet was decreased from 0.047 mm to 0.021 mm. Under the condition of the critical droplet diameter, the demisting efficiency of the swirl plate demister with the demisting ring was 96.20%.

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    Journal of Environmental Engineering Technology    2019, 9 (4): 347-348.  
    Abstract137)   HTML8)    PDF(pc) (1283KB)(28)      
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    Influence of substrate concentration on the nitrogen removal and relative genes of denitrifying MBBR for the treatment of reverse osmosis concentrate
    LI Li,YAN Guokai,WANG Haiyan,LING Yu,ZHAO Yuanzhe,WANG Huan
    Journal of Environmental Engineering Technology    2019, 9 (4): 375-383.   doi: 10.12153/j.issn.1674-991X.2019.04.260
    Abstract135)   HTML6)    PDF(pc) (4591KB)(42)      

    Denitrifying MBBR was used for the treatment of reverse osmosis concentrate with high TN and N O x - -N (N O 3 - -N and N O 2 - -N) concentrations, which was generated from Dalton Filtration Reverse Osmosis (DFRO) unit in the high-quality water reclamation process of wastewater treatment plant effluent. The variation of denitrifying MBBR efficiency and the copy number of nitrogen removal genes were studied extensively under four different substrate concentrations. The results show that when the influent N O 3 - -N and TN increased within the range of (8.70±6.34)-(24.23±8.69) and (28.43±5.69)-(44.10±7.37) mg/L, respectively, the N O 3 - -N and TN removal ratios remained stable with the increase of removal rates, but the N O 3 - -N and TN removal rates increased, while the N O 2 - -N removal ratios and rates decreased. The N O 3 - -N and TN removal ratios and rates decreased when the influent N O 2 - -N concentration increased within the range of (10.94±8.51)-(20.94±5.78) mg/L, while the N O 2 - -N removal ratios and rates increased. The biofilm on denitrifying MBBR carriers mainly consisted of cocci, bacillus and filamentous bacteria. The copy numbers of nitrogen removal genes in carrier biofilm and suspended sludge increased with the increase of influent N O 3 - -N and TN concentration, and the copy numbers of nirK, nirS and Anammox genes also increased with the increase of influent N O 2 - -N concentration.

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