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Effects of disinfection efficiency on microbial communities and corrosion processes in drinking water distribution systems simulated with actual running conditions

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Journal of Environmental Sciences 2020年第2期32卷 273-282页

作者： Ying Zhu Lu Chen Hong Xiao Fei Shen Shihuai Deng Shirong Zhang Jinsong He Chun Song Xie Wang Jianhua Zhang Li Gong Chun Hu Institute of Ecological and Environmental Sciences Sichuan Agricultural UniversityChengduSichuan 611130China Rural Environment Protection Engineering&Technology Center of Sichuan Province Sichuan Agricultural UniversityChengduSichuan 611130China College of Environmental Sciences Sichuan Agricultural UniversityChengduSichuan 611130China Soil and Fertilizer Research Institute Sichuan Academy of Agricultural SciencesChengduSichuan 610066China Key Laboratory of Agricultural Environment of Southwest China Ministry of Agriculture and Rural AffairsChengduSichuan 610066China College of Forestry Sichuan Agricultural UniversityChengduSichuan 611130China Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationInstitute of Environmental Research at Greater BayGuangzhou UniversityGuangzhouGuangdong 510006China

The effects of disinfection efficiency on microbial communities and the corrosion of cast iron pipes in drinking water distribution systems(DWDSs) were *** annular reactors(ARs) that simulated actual running conditions with UV/Cl2 disinfection and chlorination alone were *** chlorine consumption and corrosion rate were found in the AR with UV/*** to functional genes and pyrosequencing tests, a high percentage of iron recycling bacteria was detected within the biofilm of the AR with Cl2 at early running stage, whereas siderophore-producing bacteria were dominant in the biofilm of the AR with UV/*** the early running stage, the sequential use of UV light and an initial high chlorine dosage suppressed the biomass and iron-recycling bacteria in both bulk water and biofilms, thereby forming less protective scales against further corrosion, which enhanced chlorine ***-metric multidimensional scaling analysis showed that the bacterial communities in the ARs shaped from within rather than being imported by *** results indicate that the initial high disinfection efficiency within the distribution system had not contributed to the accumulation of iron-recycling bacteria at the early running *** study offer certain implications for controlling corrosion and water quality in DWDSs.

关键词： Disinfection efficiency Biofilm Iron-recycling bacteria Corrosion drinking water distribution systems

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Enhanced removal of organic matter and typical disinfection byproduct precursors in combined iron–carbon micro electrolysis-UBAF process for drinking water pre-treatment

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Journal of Environmental Sciences 2019年第4期31卷 315-327页

作者： Yinghan Chen Tao Lin Wei Chen Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Hohai University College of Environment Hohai University

The organic matter and two types of disinfection byproduct(DBP) precursors in micropolluted source water were removed using an iron–carbon micro-electrolysis(ICME)combined with up-flow biological aerated filter(UBAF) process. Two pilot-scale experiments(ICME-UBAF and UBAF alone) were used to investigate the effect of the ICME system on the removal of organic matter and DBP precursors. The results showed that ICME pretreatment removed 15.6% of dissolved organic matter(DOM)and significantly improved the removal rate in the subsequent UBAF process. The ICME system removed 31% of trichloromethane(TCM) precursors and 20% of dichloroacetonitrile(DCAN) precursors. The results of measurements of the molecular weight distribution and hydrophilic fractions of DOM and DBP precursors showed that ICME pretreatment played a key role in breaking large-molecular-weight organic matter into low-molecular-weight components, and the hydrophobic fraction into hydrophilic compounds, which was favorable for subsequent biodegradation by ***-dimensional fluorescence spectroscopy(3D-EEM) further indicated that the ICME system improved the removal of TCM and DCAN precursors. The biomass analysis indicated the presence of a larger and more diverse microbial community in the ICME-UBAF system than for the UBAF alone. The high-throughput sequencing results revealed that domination of the genera Sphingomonas, Brevundimonas and Sphingorhabdus contributed to the better removal of organic matter and two types of DBP precursors. Also, Nitrosomonas and Pseudomonas were beneficial for ammonia removal.

关键词： drinking water pre-treatment Micro-electrolysis Up-flow biological aerated filter Organic matter Disinfection by-product precursors

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Presence, dissemination and removal of antibiotic resistant bacteria and antibiotic resistance genes in urban drinking water system: A review

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Frontiers of Environmental Science & Engineering 2019年第3期13卷 13-27页

作者： Qiaowen Tan Weiying Li Junpeng Zhang Wei Zhou Jiping Chen Yue Li Jie Ma State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Antibiotic resistance in aquatic environment has become an important pollution problem worldwide. In recent years, much attention was paid to antibiotic resistance in urban drinking water systems due to its close relationship with the biosafety of drinking water. This review was focused on the mechanisms of antibiotic resistance, as well as the presence, dissemination and removal of antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in the urban drinking water system. First, the presence of ARB and ARGs in the drinking water source was discussed. The variation of concentration of ARGs and ARB during coagulation, sedimentation and filtration process were provided subsequently, in which filtration was proved to be a promising technology to remove ARGs. However, biological activated carbon (BAC) process and drinking water distribution systems (DWDSs) could be incubators which promote the antibiotic resistance, due to the enrichment of ARGs and ARB in the biofilms attached to the active carbon and pipe wall. Besides, as for disinfection process, mechanisms of the inactivation of ARB and the promotion of conjugative transfer of ARGs under chlorine, ozone and UV disinfection were described in detail. Here we provide some theoretical support for future researches which aim at antibiotic resistance controlling in drinking water.

关键词： Antibiotic resistant bacteria Antibiotic resistance genes Water source drinking water treatment plant drinking water distribution system Urban drinking water system

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Simultaneous quantification of fifty-one odor-causing compounds in drinking water using gas chromatography-triple quadrupole tandem mass spectrometry

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Journal of Environmental Sciences 2019年第5期31卷 100-110页

作者： Chunmiao Wang Jianwei Yu Qingyuan Guo Yu Zhao Nan Cao Zhiyong Yu Min Yang Key Laboratory of drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences College of Environmental Science & Engineering Yancheng Institute of Technology Beijing Waterworks Group

A wide range of compounds with various structural features can cause taste and odor(T&O)problems in drinking water. It would be desirable to determine all of these compounds using a simple analytical method. In this paper, a sensitive method combining liquid–liquid extraction(LLE) with gas chromatography-triple quadrupole tandem mass spectrometry(GC–MS/MS)was established to simultaneously analyze 51 odor-causing compounds in drinking water,including organic sulfides, aldehydes, benzenes, phenols, ethers, esters, ketones, nitrogenous heterocyclic compounds, 2-methylisoborneol and geosmin. Three deuterated analogs of target analytes, dimethyl disulfide-d6, benzaldehyde-d6 and o-cresol-3,4,5,6-d4,were used to correct the variations in recovery, and five isotope-labeled internal standards(4-chlorotoluene-d4, 1, 4-dichlorobenzene-d4, naphthalene-d8, acenaphthene-d10, phenanthrene-d10 respectively) were used prior to analysis to correct the variations arising from instrument fluctuations and injection errors. The calibration curves of the target compounds showed good linearity(R2> 0.99, level = 7),and method detection limits(MDLs) below 1/10 of the odor threshold concentrations were achieved for most of the odorants(0.10–20.55 ng/L). The average recoveries of most of the analytes in tap water samples were between 70% and 120%, and the method was reproducible(RSD drinking water treatment plants(DWTPs) were analyzed by this *** to the results, dimethyl trisulfide, dimethyl disulfide and indole were considered to be the key odorants responsible for the swampy/septic odor. 2-Methylisoborneol and geosmin were detected as the main odor-causing compounds for musty/earthy odor in DWTP B.

关键词： Odor-causing compounds drinking water GC–MS/MS High-throughput detection

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Biofiltration and disinfection codetermine the bacterial antibiotic resistome in drinking water:A review and meta-analysis

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 23-34页

作者： Kun Wan Wenfang Lin Shuai Zhu Shenghua Zhang Xin Yu Key Laboratory of Urban Environment and Health.Institute of Urban Environment Chinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Beijing Guohuan Tsinghua Environmental Engineering Design&Research Institute Co. Ltd.Beijing 100084China

The bacterial antibiotic resistome(BAR)is one of the most serious contemporary medical *** BAR problem in drinking water is receiving growing *** this study,we focused on the distribution,changes,and health risks of the BAR throughout the drinking water treatment *** extracted the antibiotic resistance gene(ARG)data from recent publications and analyzed ARG profiles based on diversity,absolute abundance,and relative *** absolute abundance of ARG was found to decrease with water treatment processes and was positively correlated with the abundance of 16S rRNA(r=0.963,/?drinking water,membrane filtration technology and water boiling are recommended at the point of use.

关键词： drinking water treatment Antibiotic resistance gene Biofiltration Chlorination

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Households’ Willingness to Pay for Disaster Resilient Safe drinking Water Sources in Southwestern Coastal Bangladesh

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International Journal of Disaster Risk Science 2019年第4期10卷 544-556页

作者： Md.Sariful Islam Sonia Afrin Md.Nasif Ahsan Mohammed Ziaul Haider Tasnim Murad Mamun Debasish Kumar Das Economics Discipline Khulna UniversityKhulna 9208Bangladesh

Nonfunctionality of engineered water sources after two catastrophic cyclones—Sidr in November 2007 and Aila in May 2009—created acute scarcity of safe drinking water in coastal *** objective of this study was to estimate households’willingness to pay(WTP)for disaster resilient water sources in Dacope upazila of Khulna District in southwestern coastal *** applying the double bounded dichotomous contingent valuation method to a dataset of 250 randomly selected households,we found that the mean WTP is BDT 263 and that inaccessibility to functional safe drinking water sources is the most significant determining factor of households’*** mean WTP for a disaster resilient water source project in the study area,we measured a present value of aggregate WTP over project’s life span worth about BDT 624(USD 7.37)million,which is about14.30 times the present value of project’s aggregate establishment and maintenance ***,charging the local inhabitants a water tariff at mean WTP would lead to the exclusion of around 50%of the people from getting access to the improved water services or create a free riding *** simulation exercises this study determined that the socially optimal water tariff is BDT 50 per *** tariff would not only generate revenue of more than five times the project cost but would also create access to disaster resilient improved drinking water sources for almost 99%of the people.

关键词： Bangladesh Disaster resilient safe drinking water Double bounded contingent valuation Household willingness to pay

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Mechanism and kinetics of 2-chlorophenol degradation in drinking water by photo-electrochemical synergic effect

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Science China Chemistry 2003年第3期46卷 259-270页

作者： SONG Qiang (宋强) QU Jiuhui (曲久辉) State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Science Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Science Chinese Academy of Sciences Beijing 100085 China

The synergic effect mechanism of photo-electrochemical oxidation is investigated in detail through reaction products and kinetics analysis in a photo-electric integral reactor with 2-chlorophenol (2-CP) as the model pollutant. A kinetics model is constructed for the combinatorial photo-electrochemical (CPE) degradation. A remarkable synergetic effect, which can significantly enhance the mineralization rate of the CPE process, is verified by the comparison of apparent kinetic constants. In the CPE process, complemental effects with multi-level and multi-pathway for pollutants degradation under our experimental conditions are speculated. It is proved that the degradation pathways are not only the simple summation of that of photolysis and electrolysis, but the formation of synergic effect through combination of several new acting approaches. The degradation efficiency is enhanced considerably by three factors, control of electrode poisoning by the UV irradiation, control of excitation and reaction trend of pollutants molecules by the UV irradiation, and control of activation effect and transfer trend by the oriented direct current (DC) electric field. An advanced oxidation system is set up through manifold of free radicals chain reactions in the CPE reactions, so that the aqueous organics can be mineralized fast and completely. It is proven by the kinetics analysis that the mineralization of organic pollutants is mainly attributed to the generation of very active hydroxyl radicals (OH@) in bulk solution from the CPE synergetic effect.

关键词： 2-chlorophenol, photo-electrochemical synergic effect, kinetics model, drinking water, microelectrolysis, UV.

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Temperature and silicate are significant driving factors for the seasonal shift of dominant diatoms in a drinking water reservoir

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Journal of Oceanology and Limnology 2019年第2期37卷 568-579页

作者： ZHANG Yun PENG Chengrong WANG Jun HUANG Shun HU Yao ZHANG Jinli LI Dunhai Key Laboratory of Algal Biology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China University of Chinese Academy of Sciences Beijing 100049 China

The individual or combined eff ect of water temperature and silicate on seasonal shift of dominant diatom species in a drinking water reservoir in China was studied in this paper. These eff ects were analyzed based on the field investigation of temporal dynamics in species composition and abundance of phytoplankton and environmental factors from September 2015 to August 2016. We firstly found that six dominant diatom species ( Fragilaria nanana , Achnanthidium catenatum , Aulacoseira ambigua , Ulnaria ulna , Cyclotella meneghiniana and Asterionella formosa (Class Bacillariophyceae)), which accounted for 98.7% of the total abundance of diatoms and 46.8% of the total abundance of phytoplankton, showed an obvious seasonal succession. Then significant driving factors for seasonal shift of the dominant diatom species were selected by Redundancy Analysis. The result showed that water temperature and silicate were the main environmental factors aff ecting the growth of diatoms on temporal scales. Next, the regressions of water temperature and silicate and dominant diatom abundance were fitted in Generalized Additive Model separately, and the smoothers of water temperature and diatom species suggested that the dominant diatom species adapted to diff erent optimum temperature ranges, which corresponded with the growth of seasonal changes. A positive linear correlation between silicate and diatom abundance was generated by Generalized Additive Model. Finally, the ordinal controls of water temperature and silicate on the growth of diatoms were analyzed on temporal scales specifically. We suggested that water temperature and silicate controlling the growth of diatoms in order. Diatoms grow well only when the two controlling factors simultaneously satisfy the growth conditions;as limiting factors, the two factors played their respective limiting roles in turn on temporal scales.

关键词： diatom drinking water reservoir seasonal succession silicate water temperature

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Hydrogeochemical characteristics of groundwater and quality assessment for the purposes of drinking and irrigation in Bougaa area,Northeastern Algeria

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Acta Geochimica 2020年第5期39卷 642-654页

作者： Riad Kouadra Abdeslam Demdoum Department of Geological Sciences University of Freres Mentouri Constantine 1ConstantineAlgeria Department of Earth Sciences Ferhat Abbas University Setif1SetifAlgeria

In the northern part of Algeria,the intensive exploitation of groundwater resources and pollution has considerably affected the aquifer water quality,especially in rural areas where groundwater is the main source of water supply for most *** study was performed to evaluate the groundwater quality and its suitability for drinking and irrigation purposes through the hydrogeochemical study on the groundwater in Bougaa region(Northeastern Algeria).Fourteen groundwater samples were collected and analyzed for p H,T,EC,TDS,and major *** samples are suitable for drinking based on the permissible limits of the Bureau of Indian standards(Indian standard specification for drinking water(IS 10500:2012),but only 35%of the samples are good enough for drinking purposes based on the water quality index of the *** of groundwater samples from various parameters and methods such as"Electrical conductivity,Sodium adsorption ratio,Soluble sodium percentage,Magnesium adsorption ratio,Residual sodium carbonate,Permeability index,Kelly’s ratio,Wilcox’s diagram,and US salinity laboratory classification"showed that groundwater in the area is chemically suitable for irrigation *** Piper trilinear diagram suggests that the groundwater mainly belongs to the hydrochemical facies Ca–Mg–Cl and Na–*** combination of ionic ratios,Gibbs plots,and saturation indices show that water–rock interaction,particularly the dissolution of carbonate,evaporation minerals,and ion exchange processes affects hydrogeochemistry of the *** processes such as evaporation and anthropogenic pollution from various sources can also have major impacts on groundwater salinity.

关键词： Groundwater Irrigation drinking WQI Sodium adsorption ratio Wilcox’s diagram

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Re-Imagining drinking water safety based on 21st century science: Microbial pathogens, emerging contaminants, byproducts, and health risks:Preface

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Journal of Environmental Sciences 2022年第7期34卷 1-2页

作者： Carsten Prasse Xin Yang Chao Chen Bin Xu Xing-Fang Li Department of Environmental Health and Engineering Johns Hopkins UniversityUSA School of Environmental Science and Engineering Sun Yat-sen UniversityChina School of Environment Tsinghua UniversityChina School of Environmental Science and Engineering Tongji UniversityChina Department of Laboratory Medicine and Pathology University of AlbertaCanada

Regulatory and technological solutions to ensure safe drinking water are not keeping up with the scope and severity of drinking water quality problems. drinking water resources are degrading as a result of agricultura... 详细信息

关键词： wastewater runoff drinking

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