MEMBRANE FILTRATION SYSTEM, AND OPERATION METHOD THEREFOR

摘要

The present invention addresses the problem of providing a membrane filtration system capable of effectively cleaning a membrane while improving the operation efficiency. In one mode, the membrane filtration system is provided with a raw water tank for temporarily storing raw water, a membrane module for filtering the raw water, a raw water pump for supplying the raw water in the raw water tank to the membrane module, a treated water tank for storing treated water filtered by the membrane module, and a backwash water pump for supplying the treated water to the membrane module as cleaning water. In the cleaning step of the membrane module, the differential pressure increasing rate and the membrane filtration permeation flow rate of the cleaning step are selected on the basis of the recovery rate set value of raw water and by using the characteristic curve of the recovery rate and the membrane filtration permeation flow rate per differential pressure increasing rate during the membrane filtration operation.