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Pollutant concentrations and pollution loads in stormwater runoff from different land uses in Chongqing

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Journal of Environmental Sciences 2013年第3期25卷 502-510页

作者： Shumin Wang Qiang He Hainan Ai Zhentao Wang Qianqian Zhang Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education Chongqing University Key Laboratory of water Environmental Restoration Chongqing University of Arts and Science Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

To investigate the distribution of pollutant concentrations and pollution loads in stormwater runoff in Chongqing,six typical land use types were selected and studied from August 2009 to September *** analysis on the distribution of pollutant concentrations in all water samples shows that pollutant concentrations fluctuate greatly in rainfall-runoff,and the concentrations of the same pollutant also vary greatly in different rainfall *** addition,it indicates that the event mean concentrations （EMCs） of total suspended solids （TSS） and chemical oxygen demand （COD） from urban traffic roads （UTR） are significantly higher than those from residential roads （RR）,commercial areas （CA）,concrete roofs （CR）,tile roofs （TRoof）,and campus catchment areas （CCA）;and the EMCs of total phosphorus （TP） and NH3-N from UTR and CA are 2.35-5 and 3 times of the class-III standard values specified in the Environmental Quality Standards for Surface water （GB 3838-2002）.The EMCs of Fe,Pb and Cd are also much higher than the class-III standard *** analysis of pollution load producing coefficients （PLPC） reveals that the main pollution source of TSS,COD and TP is *** analysis of correlations between rainfall factors and EMCs/PLPC indicates that rainfall duration is correlated with EMCs/PLPC of TSS for TRoof and TP for UTR,while rainfall intensity is correlated with EMCs/PLPC of TP for both CR and *** results of this study provide a reference for better management of non-point source pollution in urban regions.

关键词： urban land uses stormwater runoff pollution load pollutant concentration distribution

One-pot preparation of graphene oxide magnetic nanocomposites for the removal of tetrabromobisphenol A

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Frontiers of Environmental Science & Engineering 2013年第3期7卷 442-450页

作者： Liqin JI Xue BAI Lincheng ZHOU Hanchang SHI Wei CHEN Zulin HUA School of Environment Tsinghua University State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing 100084 China State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Institute of Biochemical Engineering & Environmental Technology Lanzhou University Lanzhou 730000 China College of Environmental Science and Engineering Hohai University Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake (Ministry of Education) Nanjing 210098 China

A simple solvothermal method was used to prepare monodisperse magnetite （Fe304） nanoparticles attached onto graphene oxide （GO） sheets as adsorbents to remove tetrabromobisphenol A （TBBPA） from an aqueous solution. These Fe304/GO （MGO） nanocomposites were characterized by transmission electron microscopy. The adsorption capacity at different initial pH, contact duration, and temperature were evaluated. The kinetics of adsorption was found to fit the pseudo-second-order model perfectly. The adsorption isotherm well fitted the Langmuir model, and the theoretical maximum of adsorption capacity calculated by the Langmuir model was 27.26 mg ·g^-1 The adsorption thermodynamics of TBBPA on the MGO nanocomposites was determined at 303K, 313K, and 323 K, respectively. The results indicated that the adsorp- tion was spontaneous and endothermic. The MGO nanocomposites were conveniently separated from the media by an extemal magnetic field within several seconds, and then regenerated in 0.2 M NaOH solution. Thus, the MGO nanocomposites are a promising candidate for TBBPA removal from wastewater.

关键词： Magnetic graphene oxide (GO) adsorption,tetrabromobisphenol A (TBBPA)

Magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering(MPEOD) of activated sludge： Role and behavior of moisture and organics

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Journal of Environmental Sciences 2018年第12期30卷 147-158页

作者： Xinxin Guo Xu Qian Yili Wang Huaili Zheng College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing 100083 China water Resource Development Research Center of Taihu Basin Authority Shanghai 200434 China Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment State Ministry of Education Chongqing University Chongqing 400045 China

In this study, a magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering（MPEOD） process with magnetic micro-particle conditioning–drainage under gravity–mechanical compression–electrical compression（MMPC–DG–MC–EC） stages was established to study the distribution and migration of water, extracellular polymeric substances（EPS）, and other organic matter in the activated sludge（AS） matrix at each *** showed that the MPEOD process could attain 53.52% water content（WC） in dewatered AS with bound water（BW） and free water（FW） reduction rates of 82.97% and 99.67%,respectively. The coagulation and time-delayed magnetic field effects of magnetic microparticles（MMPs） along the MMPC–DG–MC stages initiated the transformation of partial BW to FW in AS. EC had a coupling driving effect of electro-osmosis and pressure on BW, and the changes in pH and temperature at EC stage induced the aggregation of AS flocs and the release of partial BW. Additionally, MMPs dosing further improved the dewatering performance of AS by acting as skeleton builders to provide water passages. Meanwhile, MMPs could disintegrate sludge cells and EPS fractions, thereby reducing tryptophan-like protein and byproduct-like material concentrations in LB-EPS as well as protein/polysaccharide ratio in AS matrix, which could improve AS filterability. At EC stage, the former four Ex/Em regions of fluorescence regional integration analysis for EPS were obviously reduced, especially the protein-like substances in LB-and TB-EPS, which contributed to improvement of AS dewaterability.

关键词： Activated sludge Magnetic micro-particle Pressurized vertical electro-osmotic dewatering water distribution Extracellular polymeric substance Fluorescence regional integration analysis

Treatment of simulated wastewater containing Reactive Red 195 by zero-valent iron/activated carbon combined with microwave discharge electrodeless lamp/sodium hypochlorite

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Journal of Environmental Sciences 2010年第4期22卷 512-518页

作者： Jie Fu Zhen Xu Qing-Shan Li Song Chen Shu-Qing An Qing-Fu Zeng Hai-Liang Zhu State Key Laboratory of Pharmaceutical Biotechnology School of Life Sciences Nanjing University Nanjing 210093 China. Engineering Research Center for Clean Production of Textile Dyeing and Printing of Ministry of Education Wuhan University of Scienee & Engineering Wuhan 430073 China Pharmacy Department Shanghai Hospital of Skin Diseases and Sexually Transmitted Diseases Shanghai 200443 China

A comparative study of treatment of simulated wastewater containing Reactive Red 195 using zero-valent iron/activated carbon （ZVI/AC）, microwave discharge electrodeless lamp/sodium hypochlorite （MDEL/NaCIO） and the combination of ZVI/AC- MDEL/NaCIO was conducted. The preliminary results showed the two steps method of ZVI/AC-MDEL/NaCIO had much higher degradation efficiency than both single steps. The final color removal percentage was nearly up to 100% and the chemical oxygen demand reduction percentage was up to approximately 82%. The effects of operational parameters, including initial pH value of simulated wastewater, ZVI/AC ratio and particle size of ZVI were also investigated. In addition, from the discussion of synergistic effect between ZVI/AC and MEDL/NaCIO, we found that in the ZVI/AC-MEDL/NaCIO process, ZVI/AC could break the azo bond firstly and then MEDLfNaCIO degraded the aromatic amine products effectively. Reversing the order would reduce the degradation efficiency.

关键词： activated carbon microwave discharge electrodeless lamp Reactive Red 195 sodium hypochlorite zero-valent iron.

Integration of USEPA WASP model in a GIS platform

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 1015-1024页

作者： Sen PENG George Yu-zhu FU Xin-hua ZHAO School of Environmental Science and Engineering Tianjin University Tianjin 300072 China Department of Construction Management and Civil Engineering Georgia Southern University Statesboro GA 30460 USA

The integration of water quality analysis simulation program (WASP) with a geographical information system (GIS) is *** integration was undertaken to enhance the data analysis and management ability of the widely used water quality *** types of data involved in WASP modeling were converted and integrated into GIS using a database *** spatial data modeling and analysis capability of GIS were used in the operation of the *** WASP water quality model was coupled with the environmental fluid dynamics code (EFDC) hydrodynamic model.A case study of the Lower Charles River Basin (Massachusetts,USA) water quality model system was conducted to demonstrate the integration *** results showed that high efficiency of the data process and powerful function of data analysis could be achieved in the integrated model,which would significantly improve the application of WASP model in water quality management.

关键词： water quality analysis simulation program (WASP) Geographical information system (GIS) Integration Environmental fluid dynamics code (EFDC) water quality model

Perfluorocarboxylic acids(PFCAs)and perfluoroalkyl sulfonates(PFASs)in surface and tap water around Lake Taihu in China

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Frontiers of Environmental Science & Engineering 2010年第3期4卷 301-310页

作者： Yong QIU He JING Hanchang SHI State Key Joint Laboratory of Environmental Simulation and pollution control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

Perfluorinated compounds(PFCs)are ubiquitously distributed in the environment mainly as perfluorocarboxylic acids(PFCAs)and perfluoroalkyl sulfonates(PFASs).In this paper,six PFCAs and two PFASs were quantified in surface and tap water samples from 12 sites around Lake Taihu near Shanghai City in East *** PFCs were perfluorooctanoic acid(PFOA)and perfluorooctane sulfonate(PFOS),of which the concentration ranges were 6.8–206 and 1.2–45 ng·L^(–1),the geometric means were 35.3 and 9.4 ng·L^(–1),and the median(quartile range)values were 31.4(34.4)and 10.4(10.7)ng·L^(–1),*** PFCs were also detected but in much lower concentrations than *** sources of the PFCs were expected to be direct industrial discharges in the Lake Taihu area,and this area was also a possible source of PFCs contaminations in Shanghai district in the *** distributions were found different in the upstream,downstream and north part of Lake *** of PFCs in the tap water in Lake Taihu area indicated their exposure to the local people.A brief estimation of the environmental risks by PFCs implied no acute or immediate risks from PFCs to local human health,but chronic risks from PFOA in the tap water should be considered in the downstream regions.

关键词： surface and tap water perfluorocarboxylic acids(PFCAs) perfluoroalkyl sulfonates(PFASs) Lake Taihu area ultra performance liquid chromatography with tandem mass spectrometry(UPLC-MS)

Antimony(V) removal from water by iron-zirconium bimetal oxide: Performance and mechanism

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Journal of Environmental Sciences 2012年第7期24卷 1197-1203页

作者： Xuehua Li Xiaomin Dout Junqing Li Beijing Forestry University Beijing 100083China Beijing Key Laboratory for Source control Technology of water pollution Beijing Forestry UniversityBeijing 100083China

A Fe-Zr binary oxide adsorbent has been successfully synthesized using a co-precipitation method. It showed a better performance for antimonate （Sb（V）） removal than zirconium oxide or amorphous ferric oxide. The experimental results showed that the Fe-Zr adsorbent has a capacity of 51 mg/g at an initial Sb（V） concentration of 10 mg/L at pH 7.0. Sb（V） adsorption on the Fe-Zr bimetal oxide is normally an endothermic reaction. Most of the Sb（V） adsorption took place within 3 hr and followed a pseudo second-order rate law. Co-existing anions such as SO42-, NO3 and C1- had no considerable effects on the Sb（V） removal; PO3- had an inhibitory effect to some extent at high concentration; while CO2- and SiO4- showed significant inhibitory effects when they existed in high concentrations. The mechanism of Sb（V） adsorption on the adsorbent was investigated using a combination of zeta potential measurements, XPS, Raman, FT-IR observations and SO42- release determination. The ionic strength dependence and zeta potential measurements indicated that inner-sphere surface complexes were formed after Sb（V） adsorption. Raman and XPS observations demonstrated that both Fe-OH and Zr-OH sites at the surface of the Fe-Zr adsorbent play important roles in the Sb（V） adsorption. FT-IR characterization and SO42- release determination further demonstrated that the exchange of SO2- with Sb（V） also could promote the adsorption process. In conclusion, this adsorbent showed high potential for future application in Sb（V） removal from contaminated water.

关键词： antimony adsorption iron-zirconium oxide performance, mechanism

Novel photocatalytic reactor for degradation of DDT in water and its optimization model

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 732-738页

作者： Wei-hai PANG Nai-yun GAO Yang DENG Yu-lin TANG State Key Laboratory of pollution control and Resources Reuse Tongji University Shanghai 200092 China Department of Civil Engineering and Surveying University of Puerto Rico at Mayaguez Mayaguez PR 00681 USA

一张新奇相片催化反应堆被开发搬迁(从水的 1,1 二度(4-chlorophenyl )-2,2,2-trichloroethane)(DDT ) 。在反应堆， cenosphere 被用来支持借助于大音阶的第五音胶化做的 TiO 2 电影。因为 cenospheres 与 TiO 2, 是涂的，他们的比重... 详细信息

一张新奇相片催化反应堆被开发搬迁(从水的 1,1 二度(4-chlorophenyl )-2,2,2-trichloroethane)(DDT ) 。在反应堆， cenosphere 被用来支持借助于大音阶的第五音胶化做的 TiO 2 电影。因为 cenospheres 与 TiO 2, 是涂的，他们的比重稍微从原版被增加 0.6 ∼0.8 到 0.8 ∼0.9，以便他们能在水里被推迟。与 bubbler 的混合操作，在反应堆的水处于一个使流体化得好的状态。反应堆的底部是一张沙过滤器床，它能被用来阻止光催化剂被失去。反应堆的一个数学模型在二个主要有影响的因素被开发了：紫外(紫外) 轻紧张和光催化剂集中。与如此的一个模型一起，反应堆能更相当被设计。

关键词：光催化反应器优化模型水口 DDT 降解 TiO2薄膜空心微珠反应堆

Degradation of bisphenol A by microorganisms immobilized on polyvinyl alcohol microspheres

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Frontiers of Environmental Science & Engineering 2013年第6期7卷 844-850页

作者： Xue BAI Hanchang SHI Zhengfang YE Qiujin SUN Qing WANG Zhongyou WANG State Key Joint Laboratory of Environmental Simulation and pollution control School of Environment Tsinghua Unimrsity Beijing 100084 China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake (Ministry of Education) College of Environmental Science and Engineering Hohai University Nanjing 210098 China The Key Laboratory of water nd Sediment Sciences (Ministry of Education) Department of Environmental Engineering Peking University Beijing 100871 China

In this study, microorganisms （named B111） were immobilized on polyvinyl alcohol microspheres prepared by the inverse suspension crosslinked method. The biodegradation of bisphenol A （BPA） and 4-hydro- xybenzaldehyde, a degradation product of BPA, by free and immobilized B lll was investigated. The BPA degradation studies were carried out at initial BPA concentrations ranging from 25 to 150 mg·L^-1. The affinity constant Ks and maximum degradation rate Rmax were 98.3 mg·L^-1 and 19.7mg·mg^-1VSS·d^-1 for free B111, as well as 87.2mg·L^-1 and 21.1mg·mg^-1VSS·d^-1 for immobilized B 111, respectively. 16S rDNA gene sequence analyses confirmed that the dominant genera were Pseudomonas and Brevundimonas for BPA biodegradation in microorganisms B 111.

关键词： bisphenol A polyvinyl alcohol immobilizedmicroorganisms 4-hydroxybenzaldehyde