Treatment of Power Plant Sewage Based on Simultaneous Nitrification and Denitrification in SBR

A SBR was used to treat power plant sewage based on SND when pH, DO(dissolved oxygen),MLSS, were 7.0-8.0, 0.5-1mg/L, 3000±200mg/L, respectively. Results indicated average removal efficiency of COD and NH 4 + -N were 89% ,96.34%.Because of low COD/ NH 4 + -N, average removal efficiency of TN(total nitrogen)was only 71.15%, effect of SND was not apparent. After improving COD/ NH 4 + -N by adding carbon source intermittently, removal effects of COD and NH 4 + -N were not reduced, and effluent NO 3 - -N and NO 2 - -N was not accumulated, average removal efficiency of TN was 95%, and efficiency of SND was enhanced obviously. The effluent of system was recycled effectively. It indicates that SBR based on SND is feasible in theory and technology which is applied to treat power plant sewage.