Advantages: according to what you said, to reduce COD from 2000mg/l to below 60, it is necessary to reach the first-class emission standard. MBR is mainly to help improve the effect of biological system. After the activated sludge process, the whole system can be adjusted, and it is easy to achieve the goal and control. The advantage is that the investment is slightly small, and there is no need to buy installation fillers. The disadvantage is that the control is more precise, there is sludge reflux, dissolved oxygen is controlled, and the common problems of activated sludge process are prevented.

2, the front is connected by contact oxidation method.

As long as it is properly controlled, it has no effect on the effluent quality. However, because the effluent quality of MBR is limited by the function of biological system, and because the front is contact oxidation method, the sludge of MBR membrane does not need to flow back to the front, and the activated sludge gathers in MBR pool, which has little auxiliary effect on biological system. The contact oxidation method has good resistance to water quality fluctuation, but the filler needs to be replaced in three to five years, which is difficult to construct.