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Biodegradation of polycyclic aromatic hydrocarbons in sediments from the Daliao River watershed, China

Journal of environmental Sciences 2009年第7期21卷 865-871页

作者： QUAN Xiangchun, TANG Qian, HE Mengchang, YANG Zhifeng, LIN Chunye, GUO Wei state key Joint laboratory of environmental simulation and pollution control, School of Environment, Beijing Normal University, Beijing 100875, China. [a]State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

The Daliao River, as an important water system in Northeast China, was reported to be heavily polluted by polycyclic aromatic hydrocarbons （PAHs）. Aerobic biodegradations of four selected PAHs （naphthalene, phenanthrene, fluorene and anthracene） alone or in their mixture in river sediments from the Daliao River water systems were studied in microcosm systems. Effects of additional carbon source, inorganic nitrogen and phosphorus, temperature variation on PAHs degradation were also investigated. Results showed that the degradation of phenanthrene in water alone system was faster than that in water-sediment combined system. Degradation of phenanthrene in sediment was enhanced by adding yeast extract and ammonium, but retarded by adding sodium acetate and not significantly influenced by adding phosphate. Although PAHs could also be biodegraded in sediment under low temperature （5~C）, much lower degradation rate was observed. Sediments from the three main streams of the Daliao River water system （the Hun River, the Taizi River and the Daliao River） demonstrated different degradation capacities and patterns to four PAHs. Average removal rates （15 or 19 d） of naphthalene, phenanthrene, fluorene and anthracene by sediment were in the range of 0.062-0.087, 0.005-0.066, 0.008- 0.016 and 0-0.059 mg/（L.d）, respectively. As a result, naphthalene was most easily degraded compound, anthracene was the hardest one. In multiple PAHs systems, the interactions between PAHs influenced each PAH biodegradation.

关键词： biodegradation the Daliao River microcosm polycyclic aromatic hydrocarbon sediment

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The impact of PM2.5 on airway resistance in healthy young adults

The impact of PM2.5 on airway resistance in healthy young ad...

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中华医学会第十一次全国呼吸病学术会议

作者： Jiping Liao Hong Cheng Shou-En Lu Pamela Ohman-Stdkland David Rich Howard Kipen Yuedan Wang Ping Zhu Junfeng Zhang Guangfa Wang Wei Huang Tong Zhu Min Hu Shuo Xin Chengli Que Jian Cheng Liwen Zhang Department of Respiratory Medicine Peking University First Hospital State Key Laboratory of Environmental Simulation and Pollution ControlCollege of Environmental Sciences and EngineeringPeking University University of Medicine and Dentistry of New JerseyNew JerseyAmerica 100034 Peking University Health CenterBeijing Dept of HematologyPeking University First Hospital

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Modified landfill gas generation rate model of first-order kinetics and two-stage reaction

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Frontiers of environmental Science & Engineering 2009年第3期3卷 313-319页

作者： Jiajun CHEN Hao WANG Na ZHANG State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China

This investigation was carried out to establish a new domestic landfill gas(LFG)generation rate model that takes into account the impact of leachate *** first-order kinetics and two-stage reaction(FKTSR)model of the LFG generation rate includes mechanisms of the nutrient balance for biochemical reaction in two main *** this study,the FKTSR model was modified by the introduction of the outflow function and the organic acid conversion coefficient in order to represent the in-situ condition of nutrient loss through *** experiments were carried out to simulate the impact of leachate recirculation and verify the modified FKTSR *** model calibration was then calculated by using the experimental *** results suggested that the new model was in line with the experimental *** main parameters of the modified FKTSR model,including the LFG production potential(L0),the reaction rate constant in the first stage(K1),and the reaction rate constant in the second stage(K2)of 64.746 L,0.202 d^(–1),and 0.338 d^(–1),respectively,were comparable to the old ones of 42.069 L,0.231 d^(–1),and 0.231 d^(–1).The new model is better able to explain the mechanisms involved in LFG generation.

关键词： landfill gas(LFG) generation rate model first-order kinetics two-stage reaction outflow function

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A novel knotted cotton-thread carrier:Its potential use in achieving the biomass renewal of Phanerochaete chrysosporium in an immobilized growth system

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Science China Chemistry 2009年第5期52卷 670-675页

作者： ZHOU Cheng WEN XiangHua The State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environment Science and EngineeringTsinghua UniversityBeijing 100084China

In order to achieve an innovative strategy to renew the biomass of Phanerochaete chrysosporium in an immobilized growth system which can maintain white-rot fungi biomass, a novel knotted cotton-thread carrier was designed and made. By using a high-speed stirring apparatus under the conditions of 1400 r/min stirring speed for 6 min, mycelia immobilized on the knotted cotton-thread carriers were exfoliated completely and homogenized to a proper size. Furthermore, the homogenized mycelia from the immobilized mycelia can resume their growth on the knotted cotton-thread carriers in agitated flask cultures. The average regrowth biomass on the new carriers and the reused carriers was 0.0171 g/carrier and 0.0314 g/carrier, respectively. It proves that the knotted cotton-thread carrier performs perfectly in homogening the immobilized mycelia to achieve the biomass renewal of P. chrysosporium in an immobilized growth system.

关键词： knotted cotton-thread carrier biomass renewal immobilization homogenizing Phanerochaete chrysosporium

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A mini-microbial fuel cell for voltage testing of exoelectrogenic bacteria

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Frontiers of environmental Science & Engineering 2009年第3期3卷 307-312页

作者： Xiaoxin CAO Xia HUANG Xiaoyuan ZHANG Peng LIANG Mingzhi FAN State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

Current methods for testing the electricity generation capacity of isolates are time-and *** paper presents a rapid voltage testing system of exoelectrogenic bacteria called Quickscreen,which is based on a microliter microbial fuel cell(MFC).Geobacter sulfurreducens and Shewanella baltica were used as the model exoelectrogenic bacteria;Escherichia coli that cannot generate electricity was used as a negative *** was found that the electricity generation capacity of the isolates could be determined within about five hours by using Quickscreen,and that its time was relatively rapid compared with the time needed by using larger MFCs.A parallel,stable,and low background voltage was achieved using titanium as a current collector in the blank *** external resistance had little impact on the blank run during the initial *** cathode with a five-hole configuration,used to hydrate the carbon cathode,gave higher cathode potential than that with a one-hole *** discharge and current interrupt methods showed that the anode mostly contributed to the large internal resistance of the Quickscreen ***,the addition of graphite felt decreased the resistance from 18 to 5 kΩ.This device was proved to be useful to rapidly evaluate the electricity generation capacity of different bacteria.

关键词： microbial fuel cell exoelectrogenic bacteria rapid screening

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Distribution and elimination of polycyclic musks in three sewage treatment plants of Beijing, China

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Journal of environmental Sciences 2009年第5期21卷 561-567页

作者： ZHOU Haidong HUANG Xia GAO Mijun WANG Xiaolin WEN Xianghua State Key laboratory of Environmental Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China School of Civil and Environmental Engineering University of Science and Technology Beijing 100083 China

The two representative polycyclic musks, 1-（5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthenyl）-ethanone （AHTN） and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyrane （HHCB）, were measured in aqueous samples and sludge samples of three sewage treatment plants （STPs） in Beijing, China using a gas chromatograph-mass spectrometry. The HHCB and AHTN concentration ranges in the influents were 1251.4-3003.8 ng/L and 111.9-286.3 ng/L, respectively. Meanwhile, the ranges of 492.8-1285.3 ng/L for HHCB and 47.3-89.3 ng/L for AHTN were present in the effluents. The musks in the sludges were three to four orders of magnitude higher than those in aqueous sewages. The removal *** the two musks varied in the ranges of 41.7%- 70.1% for HHCB, and 25.5%-68.8% for AHTN. Adsorption onto suspended particulate matter played an important role in removing musks from the sewages. The HHCB/AHTN ratio along the treatment processes showed that the two musks had high similarity of removal from sewage by each reactor in STP. The musks in the effluent sewages may pose a low potential risk to aquatic environment in terms of the predicted-non-effect concentration. Nevertheless, considering the possible additive and synergistic effects with other compounds emitted via STPs, their bioconcentration and bioaccumulation in aquatic organisms and so on, it is essential to monitor these compounds in various compartments and to study their environmental fate.

关键词： polycyclic musks sewage sludge removal efficiency galaxolide tonalide

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Selective sorption of perfluorooctane sulfonate on molecularly imprinted polymer adsorbents

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Frontiers of environmental Science & Engineering 2009年第2期3卷 171-177页

作者： Shubo DENG Danmeng SHUAI Qiang YU Jun HUANG Gang YU Department of Environmental Science and Engineering POPs Research Centerand State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China

Perfluorooctane sulfonate(PFOS),as a potential persistent organic pollutant,has been widely detected in water environments,and has become a great concern in recent *** is very stable and difficult to decompose using conventional *** may be an attractive method to remove it from *** this study,the molecularly imprinted polymer(MIP)adsorbents were prepared through the polymerization of 4-vinylpyridine under different preparation conditions in order to remove perfluorooctane sulfonate(PFOS)from *** MIP adsorbents using perfluorooctanoic acid(PFOA)as the template had good imprinting effects and could selectively remove PFOS from aqueous *** sorption behaviors including sorption kinetics,isotherms,and effect of pH,salt,and competitive anions were *** results showed that the sorption of PFOS on the MIP adsorbents was very fast,pHdependent,and highly *** achieved fast sorption equilibrium within 1 h was attributed to the surface sorption on the fine *** sorption isotherms showed that the sorption selectivity of PFOS on the MIP adsorbents decreased at high PFOS concentrations,which may be due to the double-layer sorption and the formation of PFOS micelles on the sorbent *** sorption of PFOS on the MIP adsorbents was mainly dominated by the electrostatic interaction between the protonated vinylpyridine on the adsorbent surface and the anionic *** prepared MIP adsorbents can potentially be applied in water and wastewater treatment for selective removal of PFOS.

关键词： perfluorooctane sulfonate(PFOS) molecularly imprinted polymer(MIP)adsorbents selective sorption electrostatic interaction

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Erratum to “Effect of bromide on the formation of disinfection by-products during wastewater chlorination” [Water Research 43 (2009) 9]

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Water Research 2010年第3期44卷 1024-1024页

作者： Ying-Xue Sun Qian-Yuan Wu Hong-Ying Hu Jie Tian Environmental Simulation and Pollution Control State Key Joint Laboratory Department of Environmental Science and Engineering Tsinghua University Beijing 100084 PR China

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Development and deployment of an instrument for measurement of atmospheric peroxy radical by chemical amplification

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Science China Earth Sciences 2009年第3期52卷 333-340页

作者： LI XiaoQian QI Bin ZENG LiMin TANG XiaoYan State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China School of Chemistry and Material Sciences Shaanxi Normal UniversityXi’an 710062China

An instrument for measurement of peroxy radical by chemical amplification (PERCA) has been devel- oped at Peking University (PKU) and deployed in several field campaigns. PKU PERCA measures per- oxy radical via amplification of NO2 by peroxy radical in the presence of NO and CO through a chain reaction. The amount of amplified NO2 is detected by a NO2-luminal chemiluminescence detector. The chain length (CL) of 75±20 (1σ ) was determined routinely during field campaigns using a HO2 source from photolysis of water vapor at 185 nm in air. The detection limit for peroxy radical measurement was (1-5)×10?12 (volume ratio) with integration time of 1 min, mainly relying on the variation of the ambient O3 and NO2. The systematic uncertainty in the measurement of peroxy radical was estimated to be ±60%. The effect of water vapor on PKU PERCA was observed and determined in the laboratory. The meas- urements of peroxy radical during the Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2006 (PRIDE-PRD2006) campaign are presented to show the performance of the PERCA instrument and the behavior of the observed peroxy radical is discussed briefly.

关键词： peroxy radical PERCA measurement atmosphere

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Research on water ecological services value and eco-compensation

Research on water ecological services value and eco-compensa...

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3rd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2009

作者： Linyu, Xu Zhaoxue, Li Yang, Li State Key Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing China

ISBN: (纸本)9781424429028

Eco-compensation is an efficient method of environmental economic management on maintaining the function of ecosystem services. The eco-compensation standards are always determined according to the values of the ecosystem services. In this paper, the service function of different kind of water ecosystem has been analyzed. And the accounting methods of eco-compensation standards are suggested after analyzing and discussing some issues of service function account. ©2009 IEEE.

关键词： Ecosystems

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