一体化生物膜技术处理滨海农村污水

对厌氧-3级好氧/缺氧生物膜工艺进行技术改进,并对改进后的"一体化生物膜技术"处理低碳氮比农村生活污水进行了实际应用。新工艺增设了回流泵(回流比2∶1),且厌氧段悬浮填料装填率由原来的15%提高到30%,3级好氧/缺氧段YDT型弹性立体填料装填率依次由原来的50%、40%、25%提高到70%、60%和40%。装置连续稳定运行12个月,平均进水量为18 m3/d,HRT为3.7 d,监测结果表明:对COD、BOD、NH3-N、TN、TP和SS平均去除率分别为75.6%、85.9%、86.7%、63.9%、69.3%和85.5%;出水COD、BOD、NH3-N、TN、TP和SS的平均浓度分别在34.9、8.9、3.4、9.9、0.9和6.9 mg/L以下。改进后出水BOD和TN的去除能力有较大提高,除TP外其他各项指标均达到了设计要求。

Integrated biofilm technology for treating rural domestic sewage in coastal areas

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.