【摘 要】
：
Many problems in drinking water distribution systems (DWDSs) are caused by microbe,such as biofilm formation,biocorrosion and opportunistic pathogens growth.More iron release from corrosion scales may induce red water.Biofilm played great roles on the cor
【机 构】
：
Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Scienc
论文部分内容阅读
Many problems in drinking water distribution systems (DWDSs) are caused by microbe,such as biofilm formation,biocorrosion and opportunistic pathogens growth.More iron release from corrosion scales may induce red water.Biofilm played great roles on the corrosion.The iron-oxidizing bacteria (IOB) promoted corrosion.However,when iron-reducing bacte-ria (IRB) and nitrate-reducing bacteria (NRB) became the main bacteria in biofilm,they could induce iron redox cycling in corrosion process.This process enhanced the precipitation of iron oxides and formation of more Fe3O4 in corrosion scales,which inhibited corrosion ef-fectively.Therefore,the IRB and NRB in the biofilm can reduce iron release and red water occurrence.Moreover,there are many opportunistic pathogens in biofilm of DWDSs.The opportunistic pathogens growth in DWDSs related to the bacterial community changes due to the effects of micropollutants.Micropollutants increased the number of bacteria with an-tibiotic resistance genes (ARGs).Furthermore,extracellular polymeric substances (EPS) pro-duction was increased by the antibiotic resistant bacteria,leading to greater bacterial aggre-gation and adsorption,increasing the chlorine-resistance capability,which was responsible for the enhancement of the particle-associated opportunistic pathogens in DWDSs.More-over,O3-biological activated carbon filtration-UV-Cl2 treatment could be used to control the iron release,red water occurrence and opportunistic pathogens growth in DWDSs.
其他文献
Antibiotics are widely used in humans and animals,but their transformation from surface water to groundwater and the impact of land uses on them remain unclear.In this study,14 antibiotics were systematically surveyed in a complex agricultural area in Cen
Effective cultivation of stable aerobic granular sludge(AGS)is a crucial step in the successful application of this technology,and the formation of AGS could be facilitated by some envi-ronmental stress conditions.Four identical sequencing batch reactors(
Carbon dioxide(CO2)emissions from aquatic ecosystems are important components of the global carbon cycle,yet the CO2 emissions from coastal reservoirs,especially in developing countries where urbanization and rapid land use change occur,are still poorly u
Decabrominated diphenyl ether(BDE-209)is generally utilized in multiple polymer materi-als as common brominated flame retardant.BDE-209 has been listed as persistent organic pollutants(POPs),which was considered to be reproductive toxin in the environment
Certain poly-and perfluoroalkyl substances(PFASs)exhibit significant bioaccumula-tion/biomagnification behaviors in ecosystems.PFASs,such as perfluorooctane sulfonate(PFOS),perfluorooctanoic acid(PFOA),perfluorohexanesulfonic acid(PFHxS)and related precur
The membrane fouling caused by extracellular organic matter (EOM) and algal cells and or-ganic matter removal of two typical cyanobacteria (M.aeruginosa and Pseudoanabaena sp.)during ultrafiltration (UF) process were studied in this work.The results showe
Coagulation and precipitation is a widely applied method to remove F-from wastewater.In this work,the effect of coagulation on the removal of F-and organic matter from coking wastewater was studied using AlCl3 and FeCl3 as compound coagulants.The removal
The bioaccumulation of PAHs and metal elements in the indigenous lichens Xanthoria pari-etina was monitored during two years at a quarterly frequency,in 3 sites of contrasted an-thropic influence.The impact of the meteorological factors(temperature,relati
The redox state of arsenic controls its toxicity and mobility in the subsurface environment.Understanding the redox reactions of arsenic is particularly important for addressing its en-vironmental behavior.Clay minerals are commonly found in soils and sed
Jiaxing created a precedent using bypass riparian marshes to purify micro-polluted wa-ter sources in China.Pond-wetland complex with constructed root channel technology be-comes a paradigm which can be analogized as “human-body wetland model” based on bio