Performance,microbial community and inhibition kinetics of long-term Cu2+ stress on an air-lift nitritation reactor with self-recirculation  

作　　者：Fan Feng Cheng-Shan Duan Xi Tang Xi Chen Xuan Lu Xi-Lin Chai Qaisar Mahmood Chong-Jian Tang Li-Yuan Chai 

机构地区：[1]Department of Environmental Engineering,School of Metallurgy and Environment,Central South University,Changsha,410083,China [2]National Engineering Research Centre for Control and Treatment of Heary Metal Pollution,Changsha,410083,China [3]The Jiangxi Provincial Collaborative Research Institute for Environmental Protection Industry,Wannian,335500,China [4]Jiangxi Gaia Environmental Science&Technology Co.,Ltd.,Shangrao,334000,China [5]Department of Environmental Sciences,COMSATS University,Abbottabad,Pakistan

出　　处：《Journal of Environmental Sciences》2020年第5期117-127,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51878662,51674305);the Key Project of Science and Technology Program of Hunan Province(No.2017SK2420);the Fundamental Research Funds for the CentralUniversities of Central South University(No.2017zzts599);supported by the 2017 Huxiang Provincial Scholar Program and the 2018 Distinguished Youth Program of the Natural Science Foundation of Hunan Province(No.2019JJ20033)

摘　　要：Biological nitrogen removal process could be affected due to the presence of heavy metals owing to their toxicity and accumulation in the sludge.In this study,the impact of Cu2+shock on a long-term nitritation operation was investigated in an air-lift reactor with selfrecirculation.Both the dynamics of microbial community and inhibition kinetics under Cu2+stress were ascertained.The results showed that Cu2+exerted severe inhibition on nitritation performance of an air-lift reactor(ALR)at 25 mg/L.The corresponding NH4+-N removal efficiency decreased to below 50%,which was mainly due to the variation of microbial community structure,especially the inhibition of nitrifiers like Nitrosomonas(the relative abundance decreased from 30%to 1%after Cu2+inhibition).Kinetic parameters were obtained and compared after fitting the Haldane model.The long-term Cu2+stress on the ALR aggravated the ammonium affinity and the resistance to substrate self-inhibition of the nitritation sludge,but reduced the resistance to Cu2+inhibition.Furthermore,Cu2+acted as uncompetitive inhibitor on nitritation process.Our results provide new insights into the nitritation characteristics under long-term Cu2+stress.

关 键 词：NITRITATION Cu2+inhibition Microbial structure Haldane model Kinetics 

分 类 号：X703[环境科学与工程—环境工程] X172