The nitritation performance of biofilm reactor for treating domestic wastewater under high dissolved oxygen

查看全文 作　　者：Zhaoming [1]Zheng;Zebing [2]Li;Jing [1]Ma;Jia [1]Du;Guanghui [1]Chen;Wei [1]Bian;Jun [1]Li;Baihang [1]Zhao

机构地区：[1]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology;[2]School of Water Resources and Environmental Engineering,East China Institute of Technology

出　　处：《Journal of Environmental Sciences》索引2016年第28卷第4期,共8页

基　　金：funded by the National Water Pollution Control and Management Technology Major Projects(No.2014ZX 07201-011);the Beijing Natural Science Foundation(No.8122005)of China;the Beijing Municipal EducationCommission General Program(No.KM2012-10005028) 摘　　要：The objective of this study was to investigate the nitritation performance in a biofilm reactor for treating domestic wastewater.The reactor was operated in continuous feed mode from phases 1 to 3.The dissolved oxygen(DO)was controlled at 3.5–7 mg/L throughout the experiment.The biofilm reactor showed excellent nitritation performance after the inoculation of nitrifying sludge,with the hydraulic retention time being reduced from 24 to 7 hr.Above 90%nitrite accumulation ratio(NAR)was maintained in phase 1.Afterwards,nitratation occurred with the low NH_4^+–N concentration in the reactor.The improvement of NH_4^+–N concentration to 20–35 mg/L had a limited effect on the recovery of nitritation.However,nitritation recovered rapidly when sequencing batch feed mode was adopted in phase 4,with the effluent NH_4^+-N concentration above 7 mg/L.The improvement of ammonia oxidizing bacteria(AOB)activity and the combined inhibition effect of free ammonia(FA)and free nitrous acid(FNA)on the nitrite oxidizing bacteria(NOB)were two key factors for the rapid recovery of nitritation.Sludge activity was obtained in batch tests.The results of batch tests had a good relationship with the long term operation performance of the biofilm reactor. 关键词：生物膜反应器硝化性能生活污水溶解氧水力停留时间亚硝酸盐联合抑制作用进料方式

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The nitritation performance of biofilm reactor for treating domestic wastewater under high dissolved oxygen

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