Method for enhanced phosphorus removal of membrane bioreactor

The invention discloses a method for enhanced phosphorus removal of a membrane bioreactor. The method comprises the following steps: introducing sewage into an anaerobic pond for anaerobic treatment;introducing anaerobic purified water into an anoxic pond for anoxic treatment; introducing anoxic purified water into an aerobiotic pond for aerobiotic treatment; introducing aerobiotic purified waterinto a membrane pond and adding chemical phosphorus removal drugs for chemical phosphorus removal treatment; performing first-level reflux treatment on a part of phosphorus-removed purified water andreturning to the aerobiotic pond; performing second-level reflux treatment on a part of aerobiotic purified water and returning into the anoxic pond; performing third-level reflux treatment on a partof anoxic purified water and returning into the anaerobic pond. Total phosphorus concentration of phosphorus-removed purified water can be reduced by adjusting second-level reflux ratio, third-levelreflux ratio and/or dosage of