检索结果-南通市图书馆

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第6期24卷 969-978页

作者： Dongbin Wei Zhuowei Tan Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The reclamation and reuse of wastewater is one of the possible ways to relieve the serious fresh water resource crisis in China. Efficient reclamation treatment technologies ensure the safe reuse of reclaimed water. In order to screen out and evaluate technologies appropriate for reclamation treatment, a great deal of efforts have been brought to bear. In the present study, a toxicity-based method including a Photobacterium phosphoreum test for acute toxicity and SOS/umu test for genotoxicity, accompanied by the traditional physicochemical parameters DOC （dissolved organic carbon） and UV254 （absorbance at 254 nm）, was used to measure the treatment performance of different reclamation processes, including the anaerobic-anoxic-oxic biological process （A^2O） and subsequent physical/chemical reclamation processes （ultrafiltration, ozonation, chlorination）. It was found that for the secondary effluent after the Aao process, both the toxicity and physicochemical indices had greatly decreased compared with those of the influent. However, chemical reclamation processes such as ozonation and chlorination could possibly raise toxicity levels again. Fortunately, the toxicity elevation could be avoided by optimizing the ozone dosage and using activated carbon after ozonation. It was noted that by increasing the ozone dosage to 10 mg/L and employing activated carbon with more than 10 min hydraulic retention time, toxicity elevation was controlled. Furthermore, it was shown that pre-ozonation before activated carbon and chlorination played an important role in removing organic compounds and reducing the toxicity formation potential. The toxicity test could serve as a valuable tool to evaluate the performance of reclamation processes.

关键词： wastewater reclamation acute toxicity genotoxicity toxicity assessment

Sequential use of ultraviolet light and chlorine for reclaimed water disinfection

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第10期23卷 1605-1610页

作者： Xiujuan Wang Xuexiang Hu Chun Hu Dongbin Wei State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Several disinfection processes of ultraviolet （UV）, chlorine or UV followed by chlorine were investigated in municipal wastewater according to the inactivation of Escherichia coli, Shigella dysenteriae and toxicity formation. The UV inactivation of the tested pathogenic bacteria was not affected by the quality of water. It was found that the inactivated bacteria were obviously reactivated after one day in dark. Fluorescent light irradiation increased the bacteria repair. The increase of UV dosage could cause more damage to bacteria to inhibit bacteria self-repair. No photoreactivation was detected when the UV dose was up to 80 mJ/cm2 for E. coli DH5ct, and 23 mJ/cm2 for S. dysenteriae. Nevertheless, sequential use of 8 mJ/cm2 of UV and low concentration of chlorine （1.5 mg/L） could effectively inhibit the photoreactivation and inactivate E. coli below the detection limits within seven days. Compared to chlorination alone, the sequential disinfection decreased the genotoxicity of treated wastewater, especially for the sample with high NH3-N concentration.

关键词： chlorine disinfection sequential disinfection UV disinfection photoreactivation genotoxicity wastewater reclamation

Formation potentials of typical disinfection byproducts and changes of genotoxicity for chlorinated tertiary effluent pretreated by ozone

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第4期21卷 409-413页

作者： CAO Nan MIAO Tingting LI Kuixiao ZHANG Yu YANG Min State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Material Science and Technology Institute Beijing Forestry University Beijing 100083 China

The effects of ozonation on the formation potential of typical disinfection byproducts （DBPs） and the changes of genotoxicity during post chlorination of tertiary effluent from a sewage treatment plant were investigated. Ozonation enhanced the yields of all detected chlorine DBPs except CHCI3. At a chlorine dose of 5 mg/L, the three brominated THMs and five HAAs increased, while chloroform decreased with the increase of ozone dose from 0 to 10 mg/L （ozone dose in consumption base）. At a chlorine dose of 10 mg/L, the two mixed bromochloro species THMs and two dominant HAAs （DCAA and TCAA） increased firstly and then decreased with the increase of ozone dose, with the turning point approximately occurring at an ozone dose of 5 mg/L. The genotoxicity detected using umu test, on the other hand, was removed from 7 Ixg 4-NQO/L to a negligible level by ozonation under an ozone dose of 5 mg/L. Chlorination could further remove the genotoxicity to some extent. It was found that SUVA （UV absorbance divided by DOC concentration） might be used as an indicative parameter for monitoring the removal of genotoxicity during the oxidation.

关键词： wastewater reclamation ozonation chlorination disinfection byproducts genotoxicity

Controlling various contaminants in wastewater effluent through membranes and engineered wetland

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2009年第1期3卷 98-105页

作者： Sarper SARP Sungyun LEE Noeon PARK Nguyen Thi HANH Jaeweon CHO Department of Environmental Science and Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 500-712Korea

For effective wastewater reclamation and water recovery,the treatment of natural and effluent organic matters(NOM and EfOM),toxic anions,and micropollutants was considered in this *** different NOM(humic acid of the Suwannee River,and NOM of US and Youngsan River,Korea),and one EfOM from the Damyang wastewater treatment plant,Korea,were selected for investigating the removal efficiencies of tight nanofiltration(NF)and ultrafiltration(UF)membranes with different ***,bromate,and perchlorate were selected as target toxic anions due to their well known high ***-(2-chloroethyl)-phosphate(TCEP),oxybenzone,and caffeine,due to their different K_(ow) and pK_(a) values,were selected as target *** expected,the NF membranes provided high removal efficiencies in terms of all the tested contaminants,and the UF membrane provided fairly high removal efficiencies for anions(except for nitrate)and the relatively hydrophobic micropollutant,*** the wetlands,nitrate was successfully ***,a fair process of combining membranes with an engineered wetland could be proposed for sustainable wastewater reclamation and optimum control of contaminats.

关键词： wastewater reclamation natural organic matter(NOM) effluent organic matter(EfOM) membranes wetlands

Development and application of some renovated technologies for municipal wastewater treatment in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2007年第1期1卷 1-12页

作者： QIAN Yi WEN Xianghua HUANG Xia Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China

China has been experiencing fast economic development in recent decades at the cost of serious environ-mental *** discharge,especially municipal wastewater discharge,and non-point pollution sources are becoming the major water pollution source and research *** efforts have been made on water pollu-tion control and a number of renovated technologies and pro-cesses for municipal wastewater treatment and reclamation as well as non-point pollution control have been developed and applied in *** paper discusses the development and application of the appropriate technologies,including natural treatment systems,anaerobic biological treatment,biofilm reactors and wastewater reclamation technologies,for water pollution control in the country.

关键词： China water pollution natural treatment technology anaerobic biological treatment biofilm reactor wastewater reclamation

Advanced reclamation of Hairwork Dyeing Effluent Using a Novel Tight Nanofiltration Membrane with Improved Performance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advanced Reclamation of Hairwork Dyeing Effluent Using a Nov...

Growth and Repair Potential of Three Species of Bacteria in Reclaimed wastewater after UV Disinfection

河南省化学会2020年学术年会

作者： Xueshuang Bai Yuefei Song Yueke Sun Qihua Hu Yongxin Wang School of Environment Henan Key Laboratory for Environmental Pollution Control Key Laboratory of Yellow River and Huai River Water Environmental and Pollution Control Ministry of Education Henan Normal University

Considering the need for a sustained and steady increase in hairwork dyeing effluent (HDE)reuse rate,in this study,a novel tight,negatively charged thin-film nanocomposite (TFN)membrane with custom-tailoring removal property from real HDE after preoptimized dual-stage pretreatment was *** was prepared by interfacial polymerization (IP) method on top of the PES substrate with m-phenylenediamine aqueous solution incorporating M-tolidine-H (MTH)and carbon quantum dots (CQDs) and trimesoyl chloride organic phase in n-hexane (see Fig.1).Here,0.15 wt.%and 150 mg/L were considered to be the optimum loading content of MTH and GQDs for fabricating TFN membranes on the basis of the perm-selectivity data of those resultant membranes containing both dopant contents from 0 to 0.66 wt.%and 300 mg/L,*** with bare thin-film composite membrane,the permeate flux and salt rejection of TFN improved by 35%and concurrently maintained at 90%or *** flocculation (tree-shaped cellulose-based CLF-10)-ultrafiltration hybrid pretreatment,the ideal removal efficiency of this resultant TFN membrane module was determined with permeate recovery ratio up to 95%under the circumstance of lower operating pressure and significantly mitigated membrane *** this point,and the final cleaner reuse water only contained 227 mg·Lof total dissolved solids,35.1 mg CaCO·Lof total hardness and 1.69 mg·Lof ***,we verified the satisfying long-term operation stability and anti-fouling performance of TFN membrane,realizing the advanced reclamation of real HDE.

关键词： Nanofiltration Hairwork dyeing effluent Carbon quantum dots wastewater reclamation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2011年第4期24卷 400-407页

作者： GUO MeiTing HUANG JingJing HU HongYing LIU WenJun Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing 100084China Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055China

Objective The growth and repair potential of three typical microorganisms in reclaimed water after UV disinfection was investigated to assess the effects of photo-reactivation and dark repair of microorganisms,and the microbial safety of reclaimed water following this *** The growth and repair potential of Escherichia coli,a fecal coliform strain and Bacillus subtilis in the effluent of a biological wastewater treatment plant disinfected by a low-pressure UV lamp were *** Any increase in bacterial numbers in the effluent after UV disinfection was due to damage *** to photo-reactivating light for 8-10 h after UV irradiation with a dose of 5 mJ/cm 2,the highest percentage of photo-reactivation observed for *** and the fecal coliform strain was 29% and 15% *** showed little photo-reactivation under these *** percentage of photo-reactivation was related to the UV dose and the photo-reactivating time,and a function was developed to forecast the final concentrations of *** and the fecal coliform strain after UV disinfection with possible *** Different species of bacteria displayed different responses to UV light and different repair *** repair of indigenous bacteria in wastewater needs to be investigated in future work.

关键词： wastewater reclamation UV disinfection Growth Repair Photo-reactivation Dark repair