MBR membrane The biological reactor is basically a physical filter, so the problem caused by MBR is still related to filtration. In other words, the problem that is very easy to encounter during operation is usually the reduction of membrane flux, which leads to the inability to maintain good water production capacity, resulting in a sudden decrease in water output and water flow, the system software can not pass the sufficient water flow, resulting in a reduction in the system software's ability to solve problems, the reduction of production capacity of the sewage lifting device, leading to safety accidents such as the waste water staying in overflow mode outside the plant.

For this reason, during the regulation and operation period of WWTP MBR problems occur in the form of MBR blockage. However, the performance results show that MBR blockage is caused by many factors. The main factors that affect the operation of MBR include:

1. The main reasons for activated sludge: because the concentration of microorganisms in activated sludge is not enough, there are more carbonates or inorganic compounds; Microbial species found abnormal conditions (filamentous bacteria swelling and biological foam plastic, etc.), and MBR membrane clogging caused by excessive EPS on the surface of microorganisms. The extracellular chemical EPS in sexual sludge has high viscosity, and EPS will change at the same time when the water temperature and water body change. The problem of EPS blocking MBR is also highly concerned by more and more scholars, The MBR membrane flux decreases rapidly.

2. Water seepage dirt problem: some sewage treatment plants do not use or misoperate about 1mm fine grids to remove floating dirt in the inlet water. Some sewage treatment plants will use injection sludge to immediately add it into the biological tank in front of MBR in order to improve the concentration of activated sludge in the biological tank as soon as possible during the active sludge molding period, This part of sludge not filtered by the membrane grid will lead to membrane blockage, and even some sharp objects will lead to damage and rupture of the MBR membrane.

3. Difficulties of centrifugal fan: The unscientific selection of the design scheme and model of the membrane cleaning fan led to excessive pumping or insufficient inflation in the membrane cleaning process, which led to the sludge blockage on the MBR membrane surface due to the fan, and the excessive explosion of gas was also easy to cause excessive oxygen addition to the activated sludge. No matter whether the internal reflux or external reflux was selected, it would cause certain harm to phosphorus and nitrogen removal.

The above is It is expected that the detailed introduction of the reasons for the formation of MBR membrane clogging will enable people who want to know about MBR membrane to better understand the problem of MBR membrane clogging.