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Improvement of detection method of Cryptosporidium and Giardia in reclaimed water

Frontiers of environmental Science & Engineering 2008年第3期2卷 380-384页

作者： Tong ZHANG Xing XIE Hongying HU Yudong SONG Qianyuan WU Zusheng ZONG Environmental Simulation and Pollution Control State Key Joint Laboratory Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

Cryptosporidium and Giardia are two typical species of pathogenic protozoans that seriously endanger water *** works indicated that detection of Cryptosporidium and Giardia with modified United states environmental Protection Agency(USEPA)method-1623 using a membrane filtration-elution for sample concentration attained better recovery and lower cost compared to the USEPA *** improvements of membrane filtration-elution step as well as immunomagnetic separation(IMS)steps were investigated and an optimized method for detection of Cryptosporidium and Giardia in wastewater reclamation system was recommended in this *** experimental results show that an overnight soak of the membrane after scraping and vortex agitation before elution could enhance and stabilize the *** turbidity to 4 NTU by adding kaolin clay before filtration could effectively improve the recovery of low-turbidity *** the concentrate after centrifugation and twice acid dissociation both reduced the impact of water quality to protozoan *** in different water samples were determined by this optimized method,and the recovery of Cryptosporidium and Giardia were above 70% and 80%respectively,much higher than the acceptance of method-1623.

关键词： concentration Cryptosporidium Giardia immunomagnetic separation(IMS) wastewater reuse

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Application of the export coefficient model in estimating nutrient pollution of Dahuofang Reservoir Drainage Basin, Daliao River, China

Application of the export coefficient model in estimating nu...

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2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Liu, Rui-Min He, Meng-Chang Wang, Xiu-Juan State Key Lab. of Environ. Simulation and Pollution Control School of Environment Beijing Normal University Beijing China

ISBN: (纸本)9781424417483

In this paper, using export coefficient model and RS and GIS techniques, the NPS pollution load of Drainage Basin of Dahuofang Reservoir in the year 2000 was estimated, and its spatial distribution was simulated. Results indicates that the total nitrogen load is 3.90103 tons, and that of total phosphorus is 1.57102 tons, in which cropland, Qingyuan County and Xinbin County are important contributories. Analysis on the intensity load of NPS pollution shows that Xinbin County is the highest NPS pollution load areas, and these areas should be paid more attention in the future. © 2008 IEEE.

关键词： Remote sensing

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PREPARATION AND CHARACTERIZATION OF POLYMER-BASED SPHERICAL ACTIVATED CARBONS

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Chinese Journal of Polymer Science 2008年第5期26卷 645-651页

作者：李爱民 State Key Laboratory of Pollution Control and Resource Reuse Jiangsu Engineering and Technology Research Center for Organic Toxicant Control and Resource ReuseSchool of the EnvironmentNanjing UniversityNanjing 210093China

A series of spherical activated carbons(SACs)with different pore structures were prepared from chloromethylated polydivinylbenzene by ZnCl_2 *** effects of activation temperature and retention time on the yield and textural properties of the resulting SACs were *** the SACs are generated with high yield of above 65% and exhibit relatively high mesopore fraction(me%)of 35.7%-43.6% compared with conventional activated *** sample zlc28 prepared at 800℃for 2 h has the largest BET surf...

关键词： Spherical activated carbon Polymer Chemical activation Pore structure Adsorption.

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Back-propagation network improved by conjugate gradient based on genetic algorithm in QSAR study on endocrine disrupting chemicals

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Chinese Science Bulletin 2008年第1期53卷 33-39页

作者： JI Li WANG XiaoDong YANG XuShu LIU ShuShen WANG LianSheng State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing 210093 China Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Since the complexity and structural diversity of man-made compounds are considered, quantitative structure-activity relationships (QSARs)-based fast screening approaches are urgently needed for the assessment of the potential risk of endocrine disrupting chemicals (EDCs). The artificial neural net-works (ANN) are capable of recognizing highly nonlinear relationships, so it will have a bright applica-tion prospect in building high-quality QSAR models. As a popular supervised training algorithm in ANN, back-propagation (BP) converges slowly and immerses in vibration frequently. In this paper, a research strategy that BP neural network was improved by conjugate gradient (CG) algorithm with a variable selection method based on genetic algorithm was applied to investigate the QSAR of EDCs. This re-sulted in a robust and highly predictive ANN model with R2 of 0.845 for the training set, q2pred of 0.81 and root-mean-square error (RMSE) of 0.688 for the test set. The result shows that our method can provide a feasible and practical tool for the rapid screening of the estrogen activity of organic compounds.

关键词：化学药物内分泌人造神经网络遗传算法

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Kinetics of municipal sewage degradation in EGSB and UASB reactors at 10 ℃

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Journal of Pharmaceutical Analysis 2008年第1期20卷 66-70页

作者：张选军张亚雷周雪飞刘洪波赵建夫 Key Laboratory of Yangtze Water Environment of Ministry of Education Tongji University State Key Laboratory of Pollution Control and Resource Reuse Tongji University

Kinetics of municipal sewage degradation in Expanded Granular Sludge Bed(EGSB)and Up-flow Anaerobic Sludge Blanket(UASB)reactors at 10℃ were investigated via continuous experimental *** results indicated that the whole reaction process can be simulated by the first-order dynamic equation *** parameters such as k,Vmax and Ks of UASB in hydrolysis acidification stage were 1.08 d-1,2.8 d-1 and 372 mg/L comparing to those of 1.18 d-1,3.5 d-1 and 112 mg/L in the methanogenesis stage *** EGSB’s k,Vmax and Ks were 2.91 d-1,14.3 d-1 and 470 mg/L in the hydrolysis acidification stage comparing to those of 1.68 d-1,6.6 d-1 and 103 mg/L in the methanogenesis stage *** of k values of the two stages in UASB and EGSB indicates that hydrolysis acidification stage is the controlling step for the whole reaction process of UASB,while methanogenesis stage is the controlling step in *** with UASB,municipal sewage treatment by EGSB at 10 ℃ can reach the same effluent requirement with lower retention time due to its effluent recirculation.

关键词： Expand Granular Sludge Bed(EGSB) Up-flow Anaerobic Sludge Blanket(UASB) municipal sewage kinetics

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Combining docking and comparative molecular similarity indices analysis (COMSIA) to predict estrogen activity and probe molecular mechanisms of estrogen activity for estrogen compounds

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Chinese Science Bulletin 2008年第23期53卷 3626-3633页

作者： YANG XuShu WANG XiaoDong JI Li LI Rong SUN Cheng WANG LianSheng State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing 210093 China School of Pharmacy Nanjing Medical University Nanjing 210029 China

Estrogen compounds are suspected of disrupting endocrine functions by mimicking natural hormones, and such compounds may pose a serious threat to the health of humans and wildlife. Close attention has been paid to the prediction and molecular mechanisms of estrogen activity for estrogen compounds. In this article, estrogen receptor α subtype (ERα)–based comparative molecular similarity indices analysis (COMSIA) was performed on 44 estrogen compounds with structural diversity to find out the structural relationship with the activity and to predict the activity. The model with the significant correlation and the best predictive power (R2 = 0.965, Q2LOO = 0.599, R2pred = 0.825) was achieved. The COMSIA and docking results revealed the structural features for estrogen activity and key amino acid residues in binding pocket, and provided an insight into the interaction between the ligands and these amino acid residues.

关键词：雌性激素混合物受感器分子组成

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Description of adsorption equilibrium of PAHs on hypercrosslinked polymeric adsorbent using Polanyi potential theory

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Science China Chemistry 2008年第6期51卷 586-592页

作者： LONG Chao LI AiMin HU DaBo LIU FuQiang ZHANG QuanXing State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093China Engineering Technology Research Center of Organic Toxic Substance Control and Resource Reuse of Jiangsu Province Nanjing 210038China

In this research,static adsorption of three polycyclic aromatic hydrocarbons(PAHs),naphthalene,acenaphthene,and fluorene,from aqueous solutions onto hypercrosslinked polymeric adsorbent within the temperature range of 288-308 K is *** isotherm equations are correlated with the equilibrium data,and the experimental data is found to fit the Polanyi-Dubinin-Manes model best within the entire range of concentrations,providing evidence that pore-filling is the dominating sorption mechanism for *** study shows that the molecular size of adsorbates has distinct in-fluence on adsorption capacity of hypercrosslinked polymeric adsorbent for the PAHs;the larger the adsorbate molecular size,the lower the adsorption equilibrium *** on the Polanyi-Dubinin-Manes model,the molecular size of adsorbates was introduced to adjust the adsorbate molar *** of qv vs.(σε /Vs) are collapsed to a single correlation curve for different adsorbates on hypercrosslinked polymeric resin.

关键词： hypercrosslinked polymeric resin polycyclic aromatic hydrocarbons Polanyi potential theory

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Toxicity evaluation in a paper recycling mill effluent by coupling bioindicator of aging with the toxicity identification evaluation method in nematode Caenorhabditis elegans

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Journal of environmental Sciences 2008年第11期20卷 1373-1380页

作者： WANG, Xiaoyi SHEN, Lulu YU, Hongxia WANG, Dayong Department of Genetics and Developmental Biology Southeast University Nanjing 210009 China Key Laboratory of Developmental Genes Human Disease Ministry of Education Southeast University Nanjing 210009 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

Toxicity identification evaluation (TIE) can be used to determine the specific toxicant(s) in industrial *** the current study,the authors have attempted to combine the advantages of the model organism,Caenorhabditis elegans,with the virtues of the TIE technique,to evaluate and identify the toxicity on aging from a paper recycling mill *** results indicate that only the toxicities from mixed cellulose (MC) filtration and EDTA treatment are similar to the baseline aging toxicity,suggesting ...

关键词： metals aging toxicity identification evaluation （TIE） Caenorhabditis elegans

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Preparation and characterization of polymer-based spherical activated carbons

Preparation and characterization of polymer-based spherical ...

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作者： Zhu, Zhao-Lian Li, Ai-Min Xia, Ming-Fang Wan, Jin-Nan Zhang, Quan-Xing State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

A series of spherical activated carbons (SACs) with different pore structures were prepared from chloromethylated polydivinylbenzene by ZnCl 2 activation. The effects of activation temperature and retention time on the yield and textural properties of the resulting SACs were studied. All the SACs are generated with high yield of above 65% and exhibit relatively high mesopore fraction (me%) of 35.7%-43.6% compared with conventional activated carbons. The sample zlc28 prepared at 800C for 2 h has the largest BET surface area of 891 m2 g-1 and pore volume of 0.489 cm3 g-1. SEM and XRD analyses of zlc28 verify the presence of developed porous structure composed of disordered micrographite stacking with large amounts of interspaces in the order of nanometers. © 2008 World Scientific Publishing Company.

关键词： Chemical activation

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control concept and countermeasures for shallow lakes’eutrophication in China

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Frontiers of environmental Science & Engineering 2008年第3期2卷 257-266页

作者： Xiangcan JIN Shaoyong LU Xiaozhen HU Xia JIANG Fengchang WU State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake EnvironmentChinese Research Academy of Environmental SciencesBeijing 100012China

Research on lake eutrophication in China began in the early 1970s,and many lakes in China are now known to be in meso-eutrophic *** eutrophication has been showing a rapidly increasing trend since *** show that the main reasons for lake eutrophication include a fragile lake background environment,excessive nutrient loading into lakes,excessive human activities,ecological degeneration,weak environmental protection awareness,and lax lake *** mechanisms resulting from lake eutrophication include nutrient recycling imbalance,major changes in water chemistry(pH,oxygen,and carbon),lake ecosystem imbalance,and algal prevalence in *** concepts for controlling eutrophication should be persistently proposed,including lake catchment control,combination of pollutant source control with ecological restoration,protection of three important aspects(terrestrial ecology,lake coast zone,and submerged plant),and combination of lake management with *** to control lake eutrophication should include pollution source control(i.e.,optimize industrial structural adjustments in the lake catchment,reduce nitrogen and phosphorus emission amounts,and control endogenous pollution)and lake ecological restoration(*** a zone-lake buffer region and lakeside zone,protect regional vegetation,utilize hydrophytes in renovation technology);countermeasures for lake management should include implementing water quality management,identifying environmental and lake water goals,legislating and formulating laws and regulations to protect lakes,strengthening publicity and the education of people,increasing public awareness through participation in systems and mechanic innovations,establishing lake region management institutions,and ensuring implementation of governance and management measures.

关键词： China lake eutrophication control concept and countermeasures

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