Quick recovery method for membrane bioreactor

The invention discloses a quick recovery method for a membrane bioreactor. The method comprises four steps as follows: (1), calcium bentonite is heated to 350-450 DEG C at the heating rate of 50 DEG C/min, roasted, cooled and ground; (2), the aeration rate is adjusted, and the value of dissolved oxygen in a reactor is controlled to be 4-5 mg/L; (3), activated calcium bentonite is added once into the membrane bioreactor; (4), the mass concentration ratio of the added calcium bentonite to MLSS (mixed liquor suspended solids) is calculated, and the mass of calcium bentonite is supplemented every day. The roasted and activated calcium bentonite is added to promote quick recovery of the membrane bioreactor after high-salinity shock. After processing with the method, the removal rate of the membrane bioreactor after shock for organic matters, ammonia nitrogen and total phosphorus is increased, the membrane pollution rate is reduced, the recovery time of the reactor after shock is shortened substantially, and the quick recovery method has the advantages of simple operation, low cost, reliable running, secondary pollution avoidance and the like.