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Study on the recovery of a failed nitrifying MBR system
Author(s): LI Hongyan1, YANG Min1, *, ZHANG Yu1, GAO Feng2 1.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085 2.China Architecture Design & Research Group, Mechanical Electrical Plumbing Design & Research Institute Plumbing Design Department, Beijing 100044
Pages: 276-
281
Year: 2012
Issue:
2
Journal: Acta Scientiae Circumstantiae
Keyword: 膜生物反应器; 硝化性能; 系统恢复; 水力停留时间; 种群结构;
Abstract: 对高水力负荷条件下丧失硝化功能的膜生物反应器进行恢复实验,将水力停留时间(HRT)从原来的5h延长到正常条件下可以实现完全硝化的10h后,在进水NH4+-N浓度为500mg.L-1的条件下反应器可去除99%的NH4+-N,但NO2--N出现严重积累,在60d的实验过程中NO2--N平均出水浓度为425mg.L-1.荧光原位杂交分析结果表明,氨氧化菌(AOBs)在总菌中的比例与恢复实验前没有变化,分别为12.9%(恢复实验期)和9.75%(恢复实验前),但氨氧化杆菌(Nitrosomonas)在AOBs中的比例从80%降低到40%;亚硝酸盐氧化细菌(NOBs)在总菌中的比例下降一半(从5.64%下降至2.84%),并以慢生型的Nitrospira为主.高NO2-含量和高胞外物浓度(497.1mg.L-1)可能是导致亚硝酸盐氧化功能难以恢复的主要原因.
Citations
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