AO-MBR工艺中溶解氧对除碳脱氮效果的影响

The Impact of DO on Nitrogen and Carbon Removal in AO-MBR Process

采用A/O-MBR工艺对经过混凝沉淀＋UASB处理后的垃圾渗滤液进行后续除碳脱氮处理,并通过改变好氧段曝气量,研究了不同浓度DO条件下工艺的出水水质。结果表明：当DO维持在3.5~4.2mg/L条件下,对CODcr和NH3-N有较好的去除效果,分别达到82.3%、91.5%。另外,此条件下硝化反应进行完全,好氧池中NO3-N积累,TN的去除率也达到最好值58.3%;DO浓度提高至5.2mg/L,处理效率提高不明显,继续提高DO除碳脱氮效果降低。

Integrated A/O-MBR was used to treat the landfill leachate which had treated by coagulation sedimentation and UASB.Record water quality when the dissolved oxygen（DO） was controlled at different concentrations.The results showed that： when the DO maintained at 3.5~4.2mg/L conditions,the CODcr and NH3-N removal with good results,82.3% and 91.5% respectively.Besides,under these conditions nitration reaction proceed completely,the NO3-N start to accumulate,TN removal rate also reached the best 53.6%.When DO concentration increased to 5.2mg/L,treatment efficiency increase unobvious,and become descend if keep improve DO.