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INFLUENCE OF SEEPAGE FACE OBLIQUITY ON DISCHARGE OF GROUNDWATER AND ITS POLLUTANT INTO LAKE FROM A TYPICAL UNCONFINED AQUIFER

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Journal of Hydrodynamics 2007年第6期19卷 756-761页

作者： LI Yong WANG Chao YANG Lin-zhang LI Yi-ping state key laboratory of Hydrology-Water resources and Hydraulic Engineering Hohai University Nanjing 210098 China College of environmental Science and Engineering Hohai University Nanjing 210098 China Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China

Lab experiment and mathematical simulation Modular three dimensional finite difference groundwater （MODFLOW） were performed in a soil tank to simulate the hydrogeochemical interaction between lake and typical unconfined aquifer. Results show that the velocity decreases exponentially with the transect distance on seepage face. The maximal velocity occurs at the top point of seepage face. The obliquity of seepage face has a great influence on the maximum and distribution of seepage velocity. With the increase of the obliquity of seepage face, the maximal velocity decreases quickly and the velocity distribution becomes much more even. Most of groundwater flow and pollutant flux discharges through a narrow portion near the top of seepage face. The flow and mass concentrated in the narrow portion increase with the decrease of the obliquity of seepage face. These will benefit to design a reasonable and economical scenario to manage lakeshore and to control the pollution of lake water near lakeshore.

关键词： shallow lake unconfined aquifer groundwater discharge velocity distribution chloride MODFLOW

Bioaccumulation,Depuration and Biotransformation of 4,4'-dibromodiphenyl ether(BDE 15) in freshwater fish Crucian carp(Carassius auratus)

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Bioaccumulation,Depuration and Biotransformation of 4,4'-dib...

中国毒理学会环境与生态毒理学专业委员会第二届学术研讨会暨中国环境科学学会环境标准与基准专业委员会2011年学术研讨会

作者： Jie Cheng,Zhigang Zhao,Mengnan Shen,Shixiang Gao~* state key laboratory of pollution control and Resource reuse,school of the environment,nanjing university,nanjing 210046,PR china

Polybrominated diphenyl ethers(PBDEs) are a class of flame retardants that known to have bioaccumulation and potential toxicity to *** PBDEs in animals have been studied in many previous researches,little is known about the single low brominated diphenylethers of their fate in the aquatic *** the present study,we investigated the tissue distribution,excretion, depuration,and potential biotransformed products of 4,4’-dibromodiphenyl ether(BDE 15) after water exposure using freshwater fish Crucian carp(Carassius auratus).Fish were exposed to BDE 15 at different concentrations for 50 days,followed by a 14-day depuration period,to examine the levels of BDE 15 in the muscle,gill,liver and gut content *** analyses,bioaccumulation parameters, such as rate constants of uptake(k) and depuration(k),and corresponding half-life(t) were also *** showed that obviously rapid uptake and elimination of BDE 15 by carps was observed in both treated groups,and BDE 15 was most concentrated in the gill and liver to reach the peak concentrations on day *** corresponding estimated bioconcentration factor(BCF) values obtained for liver and gill in the low-dose treatment(1.28×10 and 1.69×10 dry weight,respectively) were higher than for ***,five unknown compounds were detected as BDE 15 metabolites in the exposed fish,a novel finding which indicated that debromination of BDEs was not the only metabolic pathway observed in *** 4-bromodiphenyl ether and diphenyl ether, another three products were proposed tentatively as mono-OH-BDE 15,diOH-BDE 15 and bromophenol using GC/EI-MS/*** the best of our knowledge,it is the first indications for the oxidation metabolism products of PBDEs in vivo exposed freshwater *** results will be useful for determination of the origin of OH-PBDEs present in wild aquatic organisms.

关键词： BDE 15 bioaccumulation parameters metabolism OH-PBDEs Crucian carp

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基于Agent的区域排污权交易仿真与分析

系统仿真学报 2008年第20期20卷 5651-5654,5660页

作者：张炳毕军袁增伟于洋王仕污染控制与资源化研究国家重点实验室南京大学环境学院

基于复杂适应系统理论的主体建模方法是分析制度有效性的一种新方法。在分析排污权交易系统中企业主体的属性和行为规则的基础上,构建了排污权交易系统模型的结构。并以江苏省常州市武进区的63家企业化学需氧量(COD)排污权交易为例,开... 详细信息

基于复杂适应系统理论的主体建模方法是分析制度有效性的一种新方法。在分析排污权交易系统中企业主体的属性和行为规则的基础上,构建了排污权交易系统模型的结构。并以江苏省常州市武进区的63家企业化学需氧量(COD)排污权交易为例,开发了基于Netlogo的排污权交易仿真模型,分析了交易时间(模型运行次数)和交易成本对区域排污权交易系统的影响。

关键词：主体仿真排污权交易 Netlogo

Hydroxyl radicals induced by quartz particles in lung alveolar macrophages: the role of surface iron

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Progress in Natural Science:Materials International 2006年第10期16卷 1038-1044页

作者： LI Yi, ZHU Tong, GUO Xinbiao and SHANG Yu ( state key Joint laboratory for environmental Simulation & pollution control, Peking university, Beijing 100871, china Occupational & environmental Health Sciences, school of Public Health, Peking university Health Science Center, Beijing 100083, china) [a]state key Joint laboratory for environmental Simulation & pollution control Peking University Beijing China [b]Occupational & environmental Health Sciences School of Public Health Peking University Health Science Center Beijing China

Previous studies have shown that hydroxyl radical generation is a key step in the mechanism of pathogenic process caused by airborne particles to the lung. However, there is no direct evidence for dose-response relationship between airborne particles and hydroxyl radical generation. In this study, hydroxyl radicals generated in lung alveolar macrophages exposed to quartz particles were measured using a highly sensitive capillary electrophoresis-fluorescence detection method. The results demonstrated that quartz particles induced the generation of hydroxyl radical in a dose-dependent manner, and the amount of the hydroxyl radicals was 10-10 mol/10 cells. The viability of alveolar macrophages exposed to quartz particles decreased with the increase of quartz concentration, showing a clear dose-response relationship. Hydroxyl radical scavenger mannitol could increase the viability of quartz-treated cells, suggesting that hydroxyl radical contributed directly to cell death. In this study this contribution accounted for about 5%-20% of cell death. The hydroxyl radical generating potential was found to be related to surface iron content of the quartz particles.

关键词： inhalable quartz hydroxyl radical capillary electrophoresis dose-response relationship iron.

Degradation of 4-chlorophenol in aqueous solution by γ-radiation and ozone oxidation

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Science china Chemistry 2006年第2期49卷 186-192页

作者： HU Jun1, WANG Jianlong1,2 & CHEN Rong1 1. laboratory of environmental Technology, Institute of Nuclear Energy Technology, Tsinghua university, Beijing 100084, china 2. state key Joint laboratory of environmental Simulation and pollution control, Tsinghua university, Beijing 100084, china Correspondence should be addressed to Wang Jianlong 1. laboratory of environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China 2. state key Joint laboratory of environmental Simulation and pollution control Tsinghua University Beijing 100084 China

The degradation of 4-chlorophenol (4-CP) by using gamma rays generated by a 60Co source in the presence of O3 was investigated. The radiolysis of 4-CP and the kinetics of 4-CP min-eralization were analyzed based on the determination of total organic carbon (TOC). The influence of initial 4-CP concentration and the free radicals scavengers (such as NaHCO3 and t-butanol) on the 4-CP degradation was also studied. The results showed that when the radiation rate was 336 Gy·min?1, 4-chlorophenol at concentration of 10 mg·L?1 could be completely degraded at the radiation dose of 2 kGy. The degradation of 4-chlorophenol could be described by a first-order reaction model, the rate constant of 4-CP degradation by combined ozonation and radiation was 0.1016 min?1, which was 2.4 times higher than the sum of radiation (0.0294 min?1) and ozonation (0.0137 min?1). It re-vealed that the combination of radiation and ozonation resulted in synergistic effect, which can re-markably increase the degradation efficiency of 4-CP.

关键词： radiolysis, 4-chlorophenol, priority pollutant, degradation, O3, synergistic effect, kinetics.

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改性滤料过滤除铁的动力学方程

同济大学学报（自然科学版） 2002年第8期30卷 969-972页

作者：邓慧萍同济大学污染控制与资源化研究国家重点实验室上海200092

对改性滤料过滤除铁的动力学过程进行了分析 ,得出了改性滤料过滤除铁的动力学微分方程。

关键词：动力学方程改性滤料过滤除铁动力学模型地下水资源水质吸附容量

RECOVERY OF p-AMINOPHENOL (PAP) FROM AQUEOUS SOLUTION BY HYPER-CROSS-LINKED RESIN AND ITS USE FOR WASTEWATER TREATMENT

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Chinese Journal of Reactive Polymers 2008年第Z1期 18-28页

作者： ZHANG Haiyun1,2 LI Aimin1,3 1. school of the environment, and state key laboratory of pollution control and Resource reuse, nanjing university, nanjing 2.0093, china 2. Department of the environmental Engineering, nanjing Institute of Technology, nanjing 211167, china 3. Engineering Technology Research Center of Organic Pollutants control and Resource reuse of Jiangsu Province, nanjing 210038, china

p-Aminophenol （PAP）, a typical amphoteric compound, has been widely used as raw chemical material and important intermediate in various fields. To study on the recovery of PAP, an experimental comparison of the adsorption and desorption properties of PAP onto three types of hyper-cross-linked resins in aqueous solutions was performed. This paper focuses on the static equilibrium adsorption and desorption behaviors, the adsorption thermodynamics, the column dynamic adsorption and desorption, and other influencing factors of adsorption, such as temperature and pH values. All the isothermal data fit well to the Freundlich model. The capacity of equilibrium adsorption for PAP on NG-10 is the highest within the temperature range 288K318K,which may greatly contribute to the advantage in specific surface area, especially the micropore area, of the adsorbent. While in the desorption experiments, NG-9 achieved relative well regeneration efficiency whether by ethanol or by 4% hydrochloric acid. Furthermore, the results of column tests and field applications were also proved that NG-9 was an effective sorbent for the reclamation PAP from wastewater.

关键词： Adsorption p-Aminophenol Hyper-cross-linked resin Recovery.

STUDY ON SIDE REACTION IN THE SYNTHESIS OF HYPERCROSSLINKED POLYMERS

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Chinese Journal of Reactive Polymers 2008年第Z1期 12-17页

作者： ZHANG Bo1 LI Aimin1 TAO Weihua1 YANG Weiben2 1. state key laboratory of pollution control and Resource reuse, school of environment, nanjing university, nanjing 2.0093, china 2. College of Chemistry and environmental Science, nanjing Normal university, nanjing 210046, china

The systematical study about side reactions have revealed the formation mechanism of oxygen-containing groups of hypercrosslinked polymers. Surface chemistry and functionality of the polymers are characterized by Fourier-transform infrared spectroscopy (FT-IR), solid state nuclear magnetic resonance (NMR) and contact angle. The results showed that the ether groups were from chloromethylated reaction, and the alcohol groups arose from partial hydrolysis of chloromethyl groups during the post-crosslinking reaction, and the carbonyl functionality was formed by further oxidation of the alcohol groups. Catalyst and solvent used in the postcrosslinking reaction would greatly influence the surface chemistry of the polymer.

关键词： Hypercrosslinked polymer Surface chemistry Oxygen-containing groups Hydrophilicity.

Adsorption of Pb2+ from water by new chelating fiber

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Adsorption of Pb2+ from water by new chelating fiber