A/O和A2/O工艺对膜生物反应器处理焦化废水影响的研究

为提高膜生物反应器对焦化废水的处理效果，采用A/O和A²/O两种工艺的膜生物反应器处理焦化废水，通过对比处理效果、分析膜污染情况，寻求膜生物反应处理焦化废水的最优工艺。实验结果表明：A²/O工艺系统对酚、NH₃-N、COD的去除率分别为99%、90%和95%；A/O工艺系统对酚、NH₃-N和COD的去除率分别为97%、75%和93%。A²/O膜生物反应器系统对焦化废水中NH₃-N的去除效果明显优于A/O膜生物反应器系统，其反硝化率为50%～70%。对膜污染分析表明不同工艺对膜污染的影响不显著，A²/O工艺膜通量衰减59%，A/O工艺膜通量衰减56%。研究表明在膜生物反应器中，A²/O工艺对焦化废水的去除效果要优于A/O工艺。

Influence of A/O and A2/O process on coking wastewater treatment in membrane bioreactor

In order to investigate optimum process,anoxic-anaerobic-oxic (A~2/O) and anoxic-oxic (A/O)process were applied to treat coking wastewater in membrane bioreactor (MBR),pollutant removal rate was ana-lyzed,and membrane fouling was studied. The results showed that the removal rate of phenol,NH_3-N,COD was 99%,90% and 95% respectively using A~2/O process. By contrast,it was 97%,75%,93% respectively with A/O process. The NH_3-N removal rate of former was obviously superior to that of later,the denitrification rate of A~2/O was maintained in the range of 50% ~ 70%,which was better than that of A/O. Analysis of membrane fouling indicates that influence of operating mode on the membrane fouling was not obvious,the permeate flux decline with A~2/O reached 59%,while it was 56% under A/O. It could be seen that A~2/O process had an ad-vantage over A/O process.