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In this study, effect of DO on simultaneous nitrification and denitrification in catching bed biofilm reactor were investigated, using three sets of parallel reactors controlled with different DO concentration. The average removal rate of COD was reached at 87% over the range of 03mg/L of DO. Comparely, NH4-N removal rate increased significantly with the increase of DO concentration. The optimize DO concentration was 23, the average removal rate of NH4-N and TN were 91.6% and 64.4% respectively. © 2011 IEEE.
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