Integrated biofilm technology for treating rural domestic sewage in coastal areas
一体化生物膜技术处理滨海农村污水

We developed a new integrated biofilm technology based on tri-stage aerobic/anoxic biofilm,which showed better running parameters and efficiency when treating the rural sewage.This new equipment was installed a recirculation pump(returning ratio is 2∶ 1).This new equipment was installed a recirculation pump(returning ratio is 2∶ 1).The padding rate of the suspending padding increased from 15% to 30% compared with the original technology at the anaerobic stage.At tri-stage of aerobic/anoxic,YDT stereo elastic media increased from 50%,40%,25% to 70%,60%,40%,respectively.This equipment was run stably for twelve months.The water injecting amount and hydraulic retention time(HRT)were set at 18 m3/d and 3.7 d,respectively.It was showed that the removal efficiencies of COD,BOD,NH3-N,TN,TP and SS were 75.6%,85.9%,86.7%,63.9%,69.3% and 85.5%,respectively.The average concentrations of COD,BOD,NH3-N,TN,TP and SS in emitting water after treatment were 34.9,8.9,3.4,9.9,0.9 and 6.9 mg/L,respectively.In a conclusion,this equipment improved the removal capacity of BOD and TN greatly and all indicators except TP reached our design demands.