The Effect of Current on Denitrification Efficiency in Sequencing Batch Biofilm Reactor

In order to improve the efficiency of biodenitrification for municipal wastewater.Research to the municipal wastewater treatment in sequencing batch biofilm(SBBR)with soft packing.Pass into the different intensity of current,examine the efficiency of the system changes in nitrogen removal When the current intensity was 50 mA,HRT was 7 h,anaerobic was 0.5 h,aeration was 3.5 h,anaerobic /anoxic was 3h、the removal rate of TN and NH+4-N both reach the maximum;When the current is 80mA the removal efficiency of TN and NO-3-N were increased by 20 % and 12 % compared without current respectively。The results show that a certain intensity of current can improve the performance of SBBR system denitrification,but after a large current will result in inhibition;the improve of nitrogen removal efficiency was mainly due to current promoted denitrification links.