Abstract
A pilot-scale modified SBR process was investigated to treat urban wastewater. The average NH4+-N efficiency removal was 98 %. The average TN removal efficiency was 52 %. The average effluent NH4+-N was 0.34 mg/L. The average effluent TN was 12 mg/L. The average effluent phosphorus was 0.75 mg/L. The average effluent COD was 35 mg/L. The result showed that the ratio of influent NH4+-N /TN was equal approximately to TN removal efficiency. The TN removal ratio was decided by the influent NH4+-N. The long anaerobic time was benefit to the nitrogen removal. The optimal anaerobic time should be set at 1 hour.
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