0 yields decreased significantly. In addition, SRB activity was inhibited significantly while activity of SOB was not significantly different. In contrast, the activity of nitrifier was enhanced by increasing oxygen to peak removal of ammonium. However, N 2 gas production was increased slightly because nitrate reduction to N 2 was inhibited at high DO concentrations.Index Terms-Simultaneous removal, sulfate, ammonium nitrogen, specific microbial activity, metabolic product.
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