The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resi...The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resistance genes(ARGs)increased sharply in the old DWDSs.Under the same residual chlorine concentration conditions,the adenosine triphos-phate concentration in the effluent of old DWDSs(Eff-old)was significantly higher than that in the effluent of newDWDSs.Moreover,stronger bioflocculation ability andweaker hy-drophobicity coexisted in the extracellular polymeric substances of Eff-old,meanwhile,iron particles could be well inserted into the structure of the biofilms to enhance the mechanical strength and stability of the biofilms,hence enhancing the formation of THMs.Old DWDSs significantly influenced the microbial community of bulk water and triggered stronger mi-crobial antioxidant systems response,resulting in higher ARGs abundance.Corroded cast iron pipes induced a unique interaction system of biofilms,chlorine,and corrosion prod-ucts.Therefore,as the age of cast iron pipes increases,the fluctuation of water quality and microbial ecology should be paid more attention to maintain the safety of tap water.展开更多
结合微生物学传统培养和分子生物学现代技术,分析了无规聚丙烯(Po lypropy lene R andom,PPR)管、镀锌钢管和铜管3种室内给水管附生生物膜微生物群落。结果表明,在以上3种管道上发育1年的附生生物膜中,分别有6种、5种和3种优势异养菌被...结合微生物学传统培养和分子生物学现代技术,分析了无规聚丙烯(Po lypropy lene R andom,PPR)管、镀锌钢管和铜管3种室内给水管附生生物膜微生物群落。结果表明,在以上3种管道上发育1年的附生生物膜中,分别有6种、5种和3种优势异养菌被分离出来;α变形杆菌纲优势异养菌所占比例在PPR管、镀锌钢管和铜管附生生物膜中依次增加,而β变形杆菌纲和放线菌纲优势异养菌所占比例则依次减小;镀锌钢管和PPR管附生生物膜中均存在作为优势异养菌的机会病原体,而铜管附生生物膜中则未分离出作为优势异养菌的机会病原体。展开更多
基金supported by the National Natural Science Foundation of China(Nos.52000043,and 51838005)the intro-duced innovative R&D team project under the“The Pearl River Talent Recruitment Program”of Guangdong Province(No.2019ZT08L387)+2 种基金the Guangdong Natural Science Foundation(No.2023A1515011509)the Science and Technology Research Project of Guangzhou(Nos.202201020177,202102020986 and 202102021044)the special fund from Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences(No.20K01KLDWST).
文摘The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resistance genes(ARGs)increased sharply in the old DWDSs.Under the same residual chlorine concentration conditions,the adenosine triphos-phate concentration in the effluent of old DWDSs(Eff-old)was significantly higher than that in the effluent of newDWDSs.Moreover,stronger bioflocculation ability andweaker hy-drophobicity coexisted in the extracellular polymeric substances of Eff-old,meanwhile,iron particles could be well inserted into the structure of the biofilms to enhance the mechanical strength and stability of the biofilms,hence enhancing the formation of THMs.Old DWDSs significantly influenced the microbial community of bulk water and triggered stronger mi-crobial antioxidant systems response,resulting in higher ARGs abundance.Corroded cast iron pipes induced a unique interaction system of biofilms,chlorine,and corrosion prod-ucts.Therefore,as the age of cast iron pipes increases,the fluctuation of water quality and microbial ecology should be paid more attention to maintain the safety of tap water.
文摘结合微生物学传统培养和分子生物学现代技术,分析了无规聚丙烯(Po lypropy lene R andom,PPR)管、镀锌钢管和铜管3种室内给水管附生生物膜微生物群落。结果表明,在以上3种管道上发育1年的附生生物膜中,分别有6种、5种和3种优势异养菌被分离出来;α变形杆菌纲优势异养菌所占比例在PPR管、镀锌钢管和铜管附生生物膜中依次增加,而β变形杆菌纲和放线菌纲优势异养菌所占比例则依次减小;镀锌钢管和PPR管附生生物膜中均存在作为优势异养菌的机会病原体,而铜管附生生物膜中则未分离出作为优势异养菌的机会病原体。
