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Studies on Fe(II)/S2O82-- S2O32- degrading diuron in aqueous system

Zhongguo Huanjing Kexue/China Environmental Science 2008年第7期28卷 620-623页

作者： Zhang, Jin-Feng Yang, Xi Zheng, Wei Chen, Lei State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

In the aqueous system of initial pH value of 7.0 through orthogonal test and individual factor test, the optimal operation condition of Fe(II)/S2O82-- S2O32- degrading diuron was determined to be Na2S2O8 concentration 2.0 mmol/L, Fe(II) concentration 1.0 mmol/L, Na2S2O3 concentration 0.5 mmol/L under the condition of reaction time 120 min, 0.1 mmol/L diuron degradation rate reached 91.3%. The sulfate free racial and hydroxyl free radical produced in system were determined by molecular probes (ethanol and tert-butanol) methods, and the reaction mechanism of Fe(II)/S2O82-- S2O32- system produced sulfate free radical was discussed.

关键词： Diuron Fe(II) Hydroxyl free radical Persulfate Sulfate free radical Thiosulfate

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QSAR Study on the Non-Monotonic Dose-Response Curve of PCBs in Chicken Embryo Hepatocyte Bioassay

QSAR Study on the Non-Monotonic Dose-Response Curve of PCBs ...

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第五届全国环境化学大会会议

作者： Yunsong Mu Aiqian Zhang Changan Gao PENG SuFen WANG LianSheng State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing Univers State Key Laboratory of Pollution Control and Resource Reuse School of Environment NanjingUniversi

Endocrine disrupting chemicals（EDCs）in the natural environment exhibit aunique non-monotonic dose-response curve and it is impossible to select one simpleindex to characterize the biological activity of these ***-activity relationship（QSAR）study on non-monotonic dose-response curvehas become a real challenge *** order to explore the possible mechanism forthe non-monotonic dose-response curve of polychlorinated biphenyls congeners（PCBs）in chicken embryo hepatocyte bioassay,AM1 method of ChemOffice wasadopted to calculate necessary structure descriptors for PCBs,while the interactionsbetween PCBs and simulated AhR ligand binding domain（LBD）were analyzed byusing FlexX in *** binding modes for PCBs have been distinguishednot only from aligned conformation but also from free binding energy.

关键词：多氯联苯非单调剂量内分泌干扰物生物活性

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Experimental study of bean stalks as bio-toilet conditioner for treating human feces

Experimental study of bean stalks as bio-toilet conditioner ...

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

作者： Liu, Yu-Ling Gao, Liang-Min Qian, Xin Lu, Gen-Fa School of Earth and Environment Science Anhui University of Science and Technology Huainan China State Key Laboratory of Pollution Control and Resource Reuse Environmental School Nanjing University Nanjing China

ISBN: (纸本)9781424417483

Employing S-15 - bio-toilet as the testing device and pulverized bean stalk particles as the conditioner, an experimental study is made on the aerobic reduction and changes of nutrient content of human feces. The index changes of PH value, organic matter, total nitrogen (TN), total phosphorus (TP) and total potassium (TK) etc. are measured. The results show that using bean stalks as the bio-toilet conditioner has a good treatment effect. The average decomposition rate of the dry weight of the mixture per week is 37.49% ,and the cumulative decomposition rate reaches 95.23%. In the resulting products, the PH value is 7.2, the total amount of organic matter is 71.02% and the content of TN, TP and TK is 3.72%, 1.53% and 4.71%, respectively. The resulting products can be recycled as an efficient organic fertilizer.

关键词： Biological materials

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A new approach for nitrite determination based on a HRP/catalase biosensor

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Materials Science and Engineering C 2008年第5-6期28卷 726-730页

作者： Chen, Hao Mousty, Christine Chen, Ling Cosnier, Serge Département de Chimie Moléculaire UMR-5250 ICMG FR-2607 BP-53 38041 Grenoble Cedex 9 France State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai China

In this paper, a new concept of enzyme inhibition-based biosensor involving a two enzyme system was developed. The latter displays a signal increase instead of a decrease in the presence of an inhibitor. HRP and catalase were thus separately entrapped into Layered Double Hydroxides (LDH), an anionic clay, as a host matrix. The inner layer was constituted of HRP electrically wired by [Zn2CrABTS] LDH and the outer layer contained catalase immobilized in [Zn3AlCl] LDH. Both enzymes catalyzed the decomposition of H2O2, HRP its reduction and catalase its breakdown into oxygen and water. Nitrite was selected as a specific inhibitor of catalase. In the presence of H2O2, the nitrite addition blocked the H2O2 consumption by catalase, inducing thus an increase in the amperometric signal of the H2O2 reduction at 0 V by the wired HRP. The optimum configuration of the bi-enzyme biosensor displayed in aerated aqueous solutions, a nitrite sensitivity of 102 μA M- 1· cm- 2 with a fast response time, the detective limit being 4 μM. © 2007 Elsevier B.V. All rights reserved.

关键词： Nitrogen compounds

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Removal of dissolved organics from Yangtze River raw water using ozone and biological activated carbon

Removal of dissolved organics from Yangtze River raw water u...

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American Water Works Association Association Annual Conference and Exposition, ACE 2008

作者： Gao, Nai-Yun Deng, Yang Su, Ding-Jiang Cai, Yun-Long State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shangha 200092 China Department of Civil Engineering and Surveying University of Puerto Rico at Mayaguez Mayaguez 00681 Puerto Rico

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Use of gamma-irradiation pretreatment for enhancement of anaerobic digestibility of sewage sludge

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Frontiers of Environmental Science & Engineering 2008年第2期2卷 247-250页

作者： Shoujun YUAN Zheng ZHENG Yanyan MU Xin YU Yongfu ZHAO School of Civil Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093China Zhongan Zhihuan Technology Assessment Center Beijing 100022China

The effects of γ-irradiation pretreatment on anaerobic digestibility of sewage sludge was investigated in this *** like solid components,soluble components,and biogas production of anaerobic digestion experiment for sewage sludge were *** values of these parameters were compared before and after γ-irradiation *** solid(TS),volatile solid(VS),suspended solid(SS),volatile suspended solid(VSS),and average floc size of samples decreased after cirradiation ***,floc size distribution of sewage sludge shifted from 80–100 mm to 0–40 mm after γ-irradiation treatment at the doses from 0 to 30 kGy,which indicated the disintegration of sewage ***,microbe cells of sewage sludge were ruptured by γ-irradiation treatment,which resulted in the release of cytoplasm and increase of soluble chemical oxygen demand(SCOD).Both sludge disintegration and microbe cells rupture enhanced the subsequent anaerobic digestion process,which was demonstrated by the increase of accumulated biogas *** with digesters fed with none irradiated sludge,the accumulated biogas production increased 44,98,and 178 mL for digesters fed sludge irradiated at 2.48,6.51,and 11.24 kGy,*** results indicated that γ-irradiation pretreatment could effectively enhance anaerobic digestibility of sewage sludge,and correspondingly,could accelerate hydrolysis process,shorten sludge retention time of sludge anaerobic digestion process.

关键词： γ-irradiation solid components soluble components anaerobic digestibility

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Comparison of Nitrogen Removal in an AN/AO and an AO Submerged Membrane Bioreactor in Treating Bathing Wastewater

Comparison of Nitrogen Removal in an AN/AO and an AO Submerg...

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The 2nd International Conference on Bioinformatics and Biomedical Engineering(iCBBE 2008)(第二届生物信息与生物医学工程国际会议)

作者： Jifeng Guo Rongchang Wang Siqing XIA State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai China

Simultaneous nitrification and denitrification (SND) and traditional nitrification and denitrification (TND) were studied in lab-scale and the full-scale submerged membrane bioreactor (MBR) tests for the bathing wastewater treatment under the same condition. As a result, the removal of the nitrogen was not only the contribution of the anoxic (AN) tank, but also the aeration (AO) tank because of its SND effect. From the two tests, it can be drawn that there would be two methods to remove the nitrogen. One was nitrification and denitrification in the AO tank and AN tank, which contributed mainly in nitrogen removal. The other was simultaneous nitrification and denitrification occurred in the AO tank, although its effect was not very significant. The contribution ratios of the two kind's nitrogen removal ways in treating the bathing wastewater were about 70％ and 30％, respectively. At the same time, the main pollutions in bathing wastewater such as COD and LAS were also studied systemically in the two scale tests. As a result, there had a good removal (over 95％) to the pollutions, in which the microorganisms played a greater role than membrane.

关键词： membrane Bioreactor (MBR) hollow fiber membrane simultaneous nitrification and denitrification (SND) traditional nitrification and denitrification (TND) bathing wastewater treatment

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Degradation of herbicide (ametryn) in water by UV-H2O2 combinated process

Degradation of herbicide (ametryn) in water by UV-H2O2 combi...

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The 2nd International Conference on Bioinformatics and Biomedical Engineering(iCBBE 2008)(第二届生物信息与生物医学工程国际会议)

作者： Naiyun GAO Wenhai CHU Dandan Zhao Bin Xu Jianfu Zhao State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai China

The removal performances of ametryn in drinking water using UV-H2O2 combinated process was investigated in this paper. The results showed that ametryn cannot be effectively removed by UV radiation and H2O2 oxidation alone, while UV-H202 combination process could achieve quite good removal efficiency. As the initial concentration of ametryn about 0.901mg/L, its remova1 efficiency reached 97.68％ under the condition that the intensity of UV radiation, the dosage of H2O2, reaction time, pH and residual concentration were 85.7μW/cm2, 5mg/L, 40minutes, 7.0 and 0.021mg/L, respectively. The kinetic effects of H2O2 dosage, pH values and ametryn initial concentration on the conversion of ametryn were examined respectively. Analysis of factors showed that UV radiation intensity, H2O2 dosage, pH values and ametryn initial concentrations have important effect on the degradation of ametryn.

关键词： advanced ozidation process ametryn drinking water UV radiation kinetics

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Biohydrogen Production from Tofu Wastewater with Glutamine Auxotrophic Mutant of Rhodobacter sphaeroides

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AIP Conference Proceedings 2008年第1期987卷 143-148页

作者： G. H. Zheng Z. H. Kang Y. F. Qian L. Wang Q. Zhou H. G. Zhu School of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

Hydrogen production from organic wastewater by photo‐bacteria has been attracted more attention, not only because hydrogen is a clean energy, but also because it can be a process for organic wastewater pre‐treatment. However NH4+, which normally is the integrant in organic wastewater, is the inhibitor to hydrogen production with photo‐bacteria. In this study, the NH4+ effect on biohydrogen generation and nitrogenase activity of anoxygenic phototrophic bacteria‐Rhodobacter sphaeroides was studied. Biohydrogen generation with wild‐type R. sphaeroides was found to be more sensitive to NH4+ due to the obvious inhibition of NH4+ to its nitrogenase. For avoiding inhibition of NH4+ to biohydrogen generation of R. sphaeroides, a glutamine auxotrophic mutant R. sphaeroides AR‐3 was obtained by EMS treatment. The mutant could generate biohydrogen efficiently in the medium with higher NH4+ concentration. Under suitable conditions, AR‐3 produced biohydrogen from tofu wastewater with an average generation rate of 14.2 ml L−1h−1, it was increased by more than 100% compared with that from wild‐type R. sphaeroides.

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Tozicity assessment of heavy metals based on Bacillus subtilis CellSense biosensor

Tozicity assessment of heavy metals based on Bacillus subtil...

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2008年中国水环境污染控制与生态修复技术学术研讨会

作者： Hong Ning ZHAO Xue Jiang WANG Si Qing XIA Tongji University State Key Laboratory of Pollution Control and Resource Reuse Shanghai200092

avy metals are widely distributed in the environment and have caused serious pollution problems in nowadays. Particular anthropogenic sources can frequently lead to increase concentrations of toxic metals，which present a serious health hazard for human and animals. Generally the toxicity of heavy metals results from the formation of bonds to thiol groups in proteins，which can directly cause deleterious effects on microbial growth and indirectly reduce microbial activity and functioning by modifying processes such as plant *** the assessment of the toxicity of heavy metal is important，At the moment，most toxicity bioassays are conducted on invertebrates，fish，plant and algae，however，these conventional analytical techniques are often expensive，require large sample volumes ，time-consuming and not suitable for on-site measurements[3]. For all of above disadvantages，the indicator systems，which are rapid，simple，sensitive and，at the same time，applicable to monitoring on-line are required to offer specific analytical information and evaluation of effects. Consequently，a range of acute toxicity bioassays have been developed to establish the toxicity levels of compounds for aquatic organisms. Biosensors have been considered as competitive tools for the detection of toxic compounds that can be used as early warning systems because of their specificity，fast response and low cost.

关键词： Tozicity assessment heavy metals Bacillus subtilis biosensor

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