%0 Journal Article
%T Study on the recovery of a failed nitrifying MBR system<br>失稳硝化膜生物反应器的性能恢复研究
%A LI Hongyan
%A YANG Min
%A ZHANG Yu
%A GAO Feng
%A <br>李红岩
%A 杨敏
%A 张昱
%A 高峰
%J 环境科学学报
%D 2012
%I 
%X In this study, we investigated the recovery process of a nitrifying membrane bio-reactor (MBR) system, which failed to achieve complete nitrification under the stress of high hydraulic loading (HRT) (5 h).When the HRT was increased from 5 h to 10 h (the condition permitting complete nitrification previously) at an influent NH4+-N concentration of 500 mg·L-1, an NH4+-N removal of 99% was achieved.However, serious NO2--N accumulation occurred, and the average NO2--N concentration in the effluent was 425 mg·L-1 during the experimental period (60 days).Fluorescence in situ hybridization (FISH) analysis showed that while the percentage of ammonia-oxidizing bacteria (AOBs) in total bacteria did not change (12.9% in this study compared to 9.75% at the HRT of 5 h in previous study), the percentage of fast-growing Nitrosomonas sp.in AOBs decreased from 80% to 40%.The percentage of nitrite-oxidizing bacteria (NOBs) was only half of that at 5 h HRT (from 5.64% to 2.84%), and the slow-growing Nitrospira sp.remained as the dominant nitrite oxidizing population.It is possibly the high NO2- and extracellular (497·1 mg·L-1) concentrations in the reactor that made the nitrate oxidizing function difficult to recover.
%K MBR
%K nitrification
%K performance recovery
%K HRT
%K microbial community structure<br>膜生物反应器
%K 硝化性能
%K 系统恢复
%K 水力停留时间
%K 种群结构
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=C65FC071C781EE3A927F1BB8D8B38C1E&yid=99E9153A83D4CB11&vid=9971A5E270697F23&iid=0B39A22176CE99FB&sid=44A4891E33BFF455&eid=C1B34927D429E92F&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=0&reference_num=38