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《Research of Environmental Sciences》 2006-01
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Correlation between Treatment Performance and Microorganism Community Structure in Inside-Circle A/O/IAT-IAT Process

CHAI Yan-li,ZHOU Yue-xi,WANG Hai-yan,JIANG Jin-yuan(Water Pollution Control Technology Laboratory,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)  
The correlation between the treatment performance and the microorganism community structure in inside-circle A/O/IAT-IAT process was investigated.The reactor was operated in two different modes.In the mode 1(HRT was 20 h,SRT was 3.5 d),the effluent COD_(Cr),NH_4~+-N,(PO_4~(3-)-P) were 9.2~30.6,3.2~7.6,0.2~0.5 mg/L,respectively;in mode 2(HRT was 15 h,SRT was 5.0 d),the effluent COD_(Cr),(NH_4~+-N,) PO_4~(3-)P were 1.2~23.0,0.1~2.1,0.3~1.3 mg/L,respectively. The results revealed that compared to the mode 1,the removal rates of(NH_4~+-N,) SS raised 12% and 59.4% respectively,but PO_4~(3-)-P reduced(7.9%) in the mode 2.The activated sludge characteristic and the microorganism community structure all changed in the two modes.The activated sludge SV declined from 75%~80% to 37%~54%.The dominant bacteria of the activated sludge were Proteobacteria in the two modes,but the dominant microzoa were fixed protozoan in the mode 1,and Arcella vulgaris in the mode 2.The density of fixed metazoan in the mode 2 was ten times of that in the model 1.
【Fund】: 国家高技术研究发展计划项目(2002AA601320B)
【CateGory Index】: X703
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