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Microbial community and functional genes in the rhizosphere of alfalfa in crude oil-contaminated soil

Frontiers of environmental Science & Engineering 2012年第6期6卷 797-805页

作者： YiZHONG Jian WANG Yizhi SONG Yuting LIANG Guanghe LI School of Environment Tsinghua UniversityBeijing 100084China State Key Joint Laboratory of Environmental Simulation and Pollution Control Tsinghua UniversityBeijing 100084China

A rhizobox system constructed with crude oil- contaminated soil was vegetated with alfalfa （Medicago sativa L.） to evaluate the rhizosphere effects on the soil microbial population and functional structure, and to explore the potential mechanisms by which plants enhance the removal of crude oil in soil. During the 80-day experiment, 31.6% of oil was removed from the adjacent rhizosphere （AR）; this value was 27% and 53% higher than the percentage of oil removed from the far rhizosphere （FR） and from the non-rhizosphere （NR）, respectively. The populations of heterotrophic bacteria and hydrocarbon- degrading bacteria were higher in the AR and FR than in the NR. However, the removal rate of crude oil was positively correlated with the proportion of hydrocarbon- degrading bacteria in the rhizosphere. In total, 796, 731, and 379 functional genes were detected by microarray in the AR, FR, and NR, respectively. Higher proportions of functional genes related to carbon degradation and organic remediation, were found in rhizosphere soil compared with NR soil, suggesting that the rhizosphere selectively increased the abundance of these specific functional genes. The increase in water-holding capacity and decrease in pH as well as salinity of the soil all followed the order of AR 〉 FR 〉 NR. Canonical component analysis showed that salinity was the most important environmental factor influencing the microbial functional structure in the rhizosphere and that salinity was negatively correlated with the abundance of carbon and organic degradation genes.

关键词： crude oil-contaminated soil phytoremedia-tion rhizosphere effects rhizobox functional genes

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Frontispiece: Point Decoration of Silicon Nanowires: An Approach Toward Single-Molecule Electrical Detection

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Angewandte Chemie International Edition 2014年第20期53卷

作者： Jindong Wang Fangxia Shen Zhenxing Wang Gen He Jinwen Qin Nongyi Cheng Prof. Maosheng Yao Prof. Lidong Li Prof. Xuefeng Guo School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 (P. R. China) State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Science and Engineering Peking University Beijing 100871 (P.R. China) Center for Nanochemistry Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 (P.R. China) Maosheng Yao State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Science and Engineering Peking University Beijing 100871 (P.R. China)=== Lidong Li School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 (P. R. China)=== Xuefeng Guo Center for Nanochemistry Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 (P.R. China)===

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Degradation behavior of 17α-ethinylestradiol by ozonation in the synthetic secondary effluent

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Journal of environmental Sciences 2012年第2期24卷 228-233页

作者： Zheyun Zhang Hongtao Zhu Xianghua Wen Xiurong Si Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China School of Chemical ＆ Environmental Engineering China University of Mining and Technology Beijing 100083 China

Endocrine disrupting chemicals（EDCs） in the secondary effluent discharged from wastewater treatment plants（WWTPs） are of great concern in the process of water *** has been reported as a powerful oxidation technology to eliminate micropollutants in water *** to the complexity of the wastewater matrix,orthogonal experiments and single factor experiments were conducted to study the influence of operational parameters on the degradation of 17α-ethinylestradiol（EE2） in the synthetic secondary *** results of the orthogonal experiments indicated that the initial ozone and natural organic matter（NOM） concentration significantly affected EE2 degradation efficiency,which was further validated by the single factor confirmation ***2 was shown to be effectively degraded by ozonation in the conditions of low pH（6）,NOM（10 mg/L）,carbonate（50 mg/L）,but high suspended solid（20 mg/L） and initial ozone concentration（9 mg/L）.The study firstly revealed that the lower pH resulted in higher degradation of EE2 in the synthetic secondary effluent,which differed from EDCs ozonation behavior in pure ***2 degradation by ozone molecule instead of hydroxyl radical was proposed to play a key role in the degradation of EDCs by ozonation in the secondary *** ratio between O3 and TOC was identified as an appropriate index to assess the degradation of EE2 by ozonation in the synthetic secondary effluent.

关键词： ozonation EE2 pH natural organic matter secondary effluent

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Photocatalytic degradation of perfluorooctanoic acid with β-Ga_2O_3 in anoxic aqueous solution

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Journal of environmental Sciences 2012年第4期24卷 774-780页

作者： Baoxiu Zhao Mou Lv Li Zhou School of Environmental and Municipal Engineering Qingdao Technological UniversityQingdao 266033China State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

Perfluorooctanoic acid （PFOA） is a new-found hazardous persistent organic pollutant, and it is resistant to decomposition by hydroxyl radical （HO.） due to its stable chemical structure and the high electronegativity of fluorine. Photocatalytic reduction of PFOA with β-Ga2O3 in anoxic aqueous solution was investigated for the first time, and the results showed that the photoinduced electron （ecb） coming from the β-Ga2O3 conduction band was the major degradation substance for PFOA, and shorter-chain perfluorinated carboxylic acids （PFCAs, CnF2n＋1COOH, 1 ≤ n ≤ 6） were the dominant products. Furthermore, the concentration of F- was measured by the IC technique and defluorination efficiency was calculated. After 3 hr, the photocatalytic degradation efficiency was 98.8% and defluorination efficiency was 31.6% in the presence of thiosulfate and bubbling N2. The degradation reaction followed first-order kinetics （k = 0.0239 min-1, t1/2 = 0.48 hr）. PFCAs （CnF2n＋xCOOH, 1 ≤ n≤ 7） were detected and measured by LC-MS and LC-MS/MS methods. It was deduced that the probable photocatalytic degradation mechanism involves ec-b attacking the carboxyl of CnF2n＋1COOH, resulting in decarboxylation and the generation of CnFzn＋1. The produced CnF2n＋1 reacted with H2O, forming CnF2n＋1OH, then CnF2n＋1OH underwent HF loss and hydrolysis to form CnF2,＋1COOH.

关键词： perfluorooctanoic acid β-Ga2O3 photocatalytic degradation defluorination photoinduced electron

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Enhanced nitrogen removal reliability and efficiency in integrated constructed wetland microcosms using zeolite

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Frontiers of environmental Science & Engineering 2012年第1期6卷 140-147页

作者： Yue WEN Chao XU Gang LIU Yi CHEN Qi ZHOU State Key Lab of Pollution Control and Resources Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The purpose of this study is to reduce the seasonal fluctuation and enhance the efficiency of nitrogen removal in vertical flow-horizontal subsurface flow （VF- HSF） constructed wetlands. Two sets of VF-HSF con- structed wetlands were built, VF 1-HSF 1 and VF2-HSF2, and a zeolite section was placed in VF2. The results showed that VF2-HSF2 compared to VF 1-HSF 1 was not only a more reliable nitrogen removal method, but also enhanced the nitrogen removal efficiency by 50%. The average apparent rate of nitrogen removal in VF2-HSF2 reached to 2.52gN.m^-3·d^-1, which doubled the rate in VF1-HSF1. Plant uptake and organic nitrogen sediment accounted for 12% and 6% of the total nitrogen removal in VF1-HSF1, respectively, and 10% and 4% in VF2-HSF2, respectively. Biologic nitrogen removal was the dominant mechanism, which accounted for 79% and 87% of the total nitrogen removal in VF1-HSF1 and VF2-HSF2, respectively. Ammonia adsorbed by zeolite during the cold seasons was desorbed, and then nitrified in warm seasons, which resulted in a bioregeneration efficiency of 91%. Zeolite in VF was capable of transferring ammonia from cold seasons to warm seasons as well as enhancing nitrification, which was accompanied by high potential denitrification in HSF that reinforced the efficiency and relieved seasonal fluctuation of nitrogen removal in VF- HSF.

关键词： constructed wetland zeolite bioregeneration nitrogen removal

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Modelling a thermodynamic-based comparative framework for urban sustainability: Incorporating economic and ecological losses into emergy analysis

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Ecological Modelling 2012年 247卷 233-240页

作者： Liu, Gengyuan Yang, Zhifeng Chen, Bin Zhang, Lixiao State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

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The Application of Organica Ecological Technology in Residential Sewage Treatment

The Application of Organica Ecological Technology in Residen...

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International Conference on pollution and Treatment Technology(PTT 2013）

作者： Qin Yuje Wu Jiandong Ouyang Hai College of Environmental Science and Engineering South China University of Technology State Key Laboratory Subtropical Building Science The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education South China University of Technology

Water is the basis in ecological residential area. It is very important to recycle the water resource in the designing and planning of the ecological residential quarter due to the critical way to realize the wastewater resource utilization. In this paper, a new technology of wastewater treatment is introduced, which is ORGANICA ecotechnology. We integrate the traditional wastewater treatment technology and modern ecological engineering technology together and apply the integrated technology in the treatment of domestic sewage. The treated water can be reused for landscape and greening, which can beautify the residential area and recycle wastewater.

关键词： ORGANICA Technology Ecological Residence Water Recycle

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Direct Detection of Adenovirus in environmental Waste Waters by Portable Optical Fiber Sensor Platform

Direct Detection of Adenovirus in Environmental Waste Waters...

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IEEE Sensors

作者： Nimet Yildirim Dan Li Feng Long April Z. Gu Bioengineering PhD Program Northeastern University Boston US State Key Joint Laboratory of Environment Simulation and Pollution Control Environmental Science and Engineering Tsinghua University Beijing China Department of Environment Science and Engineering Tsinghua University Beijing China Department of Civil and Environmental Engineering Northeastern University Boston US

ISBN: (纸本)9781467346412

Reusable and portable evanescent wave biosensor for rapid, sensitive and highly selective direct detection of adenoviruses was developed. Here, specific antibody for the hexon protein of the virus was used as a recognition element. Linear detection range was determined from 100PFU/ml to 2000PFU/ml. This direct detection system can be regenerated successfully with over 5 times without significant deterioration of the sensor performance. The developed biosensor system has high specificity towards adenovirus, and it was applied to environmental waste water samples for the detection of adenovirus with 95 to 117% recovery and 1.1 to 8.1% cv values (n=2).

关键词： ADENOVIRUS DETECTION DIRECT

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Unveiling formation mechanism of carcinogenic N-nitrosodimethylamine in ozonation of dimethylamine: a density functional theoretical investigation

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Journal of hazardous materials 2014年 279卷 330-5页

作者： Siyu Zhang Gang Yu Jingwen Chen Bin Wang Jun Huang Shubo Deng State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment POPs Research Center Tsinghua University Beijing 100084 China Veolia Environment Joint Research Center for Advanced Technology Tsinghua University Beijing 100084 China. Veolia Environment Joint Research Center for Advanced Technology Tsinghua University Beijing 100084 China. Electronic address: yg-den@***. Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China.

Recent studies found that ozonation of organic pollutants with dimethylamino groups produces N-nitrosodimethylamine (NDMA) that is highly carcinogenic to humans. However, the formation mechanism of NDMA remains inexplicit, and previously proposed mechanisms are inconsistent with experimental observations. In this study, the formation mechanism of NDMA in ozonation was explored by density functional theory (DFT) calculations, with dimethylamine (DMA) as a model compound. By calculating Gibbs energies and energy barriers, formation of NDMA in ozonation of DMA was observed to proceed through a hydroxylamine mechanism. The calculation results show that hydroxylamine is generated through DMA reacting with hydroxyl radicals (HO•) formed from hydrolysis of ozone. DMA reacting with hydroxylamine can produce unsymmetrical dimethylhydrazine (UDMH), a well-known NDMA precursor. Transformation of UDMH to NDMA is mainly induced by ozone or HO• rather than dissolved oxygen proposed previously. The reaction of DMA and hydroxylamine is pH dependent, with energy barriers increasing from neutral pH to the second pKa of hydroxylamine and then decreasing. This is in accordance with the experimentally observed pH dependence of NDMA yield in ozonation, indicating that the hydroxylamine mechanism is responsible for the NDMA formation in ozonation.

关键词： Density functional theory Dimethylamine Hydroxylamine N-nitrosodimethylamine Ozonation

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Determination of dioxin-like polychlorinated biphenyls in soil and moss from Fildes Peninsula,Antarctica

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Chinese Science Bulletin 2012年第9期57卷 992-996页

作者： WANG Qiang SHI YeHong HU JianXin YAO ZiWei FANG XueKun DONG YiAn State Key Joint Laboratory for Environmental Simulation ＆ Pollution Control College of Environmental Science and Engineering Peking University Beijing 100871 China National Marine Environmental Monitoring Centre Dalian 116023 China

Dioxin-like polychlorinated biphenyls(PCBs) are a class of toxic and persistent chemicals that are often found in the *** determination of dioxin-like PCBs in Fildes Peninsula,Antarctica,is reported in this ***-like PCBs were widely distributed in Antarctic soil and moss with concentration of 2.23-27.2 pg/g in soil and 10.4-812 pg/g in *** highest concentrations were found in the Ardley Island area and the lowest concentrations on the west *** contribution of PCB-118 to the ∑12PCBs ranged from 36.0% to 69.6% in soil,and 17.2% to 43.4% in *** congener specific patterns in soil and moss were ***-range atmospheric transport is thought to be the main source of PCBs detected on King George *** ∑12PCBs toxic equivalent(TEQ) in soil was 0.400×10?3 to 516×10?3 pg(TEQ)/g with a mean value of 147×10?3 pg(TEQ)/***-126 had the largest contribution(81.1%) to the ∑12PCBs TEQ in *** ∑12PCBs TEQ in moss ranged from 2.90×10?3 to 1.19 pg/g with a mean value of 0.482 pg/***-126 was also the largest contributor(91.4%) to the ∑12PCBs TEQ in *** mean TEQ in moss was about 40 times that in soil.

关键词：南极菲尔德斯半岛二恶英类多氯联苯土壤苔藓测定方法毒性当量最低浓度

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