Total Nitrogen Removal of Effluent from a Municipal Sewage Treatment Plant via a Composite Biofilter

A pilot-scale Composite Biofilter was applied to treat the effluent of secondary sediment tank from a Sewage Treatment Plant, which Total Nitrogen (TN) was mainly composed of nitrate, sodium acetate was added into it as external carbon source, and the results indicated that, the optimal conditions for Composite Biofilter was about at, HRT of 2 h and sodium acetate of 100 mg/L, the concentrations of ammonia, TN and TP of treated effluent was averagely about at 0.95 mg/L, 9.2 mg/L and 0.05 mg/L respectively, which was measured up to strict local standards, in addition, the Composite Biofilter had the advantage on phosphorous removal either, and a good performance of denitrification was achieved on low temperature (5-15 degrees C).