Performance, microbial community and inhibition kinetics of long-term Cu2+ stress on an air-lift nitritation reactor with self-recirculation |
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Authors: | Fan Feng Cheng-Shan Duan Xi Tang Xi Chen Xuan Lu Xi-Lin Chai Qaisar Mahmoo Chong-Jian Tang Li-Yuan Chai |
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Institution: | Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China;National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China;The Jiangxi Provincial Collaborative Research Institute for Environmental Protection Industry, Wannian, 335500, China;Jiangxi Gaia Environmental Science & Technology Co., Ltd., Shangrao, 334000, China;Department of Environmental Sciences, COMSATS University, Abbottabad, Pakistan |
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Abstract: | 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 Cu~(2+)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 Cu~(2+) stress were ascertained.The results showed that Cu~(2+) exerted severe inhibition on nitritation performance of an air-lift reactor(ALR) at 25 mg/L.The corresponding NH_4~+-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 Cu~(2+)inhibition).Kinetic parameters were obtained and compared after fitting the Haldane model.The long-term Cu~(2+) stress on the ALR aggravated the ammonium affinity and the resistance to substrate self-inhibition of the nitritation sludge,but reduced the resistance to Cu~(2+) inhibition.Furthermore,Cu~(2+)acted as uncompetitive inhibitor on nitritation process.Our results provide new insights into the nitritation characteristics under long-term Cu~(2+) stress. |
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Keywords: | Nitritation Microbial structure Haldane model Kinetics |
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