METHOD AND APPARATUS FOR CLEANING MEMBRANE MODULE

摘要

A cleaning chemical liquid is circulated, and, at the same time, a difference in amount of liquid between the chemical liquid, which flows into a membrane element and the chemical liquid which flows out from the membrane element is increased or decreased for regulation. According to the above constitution, the utilization efficiency and the cleaning efficiency of the chemical liquid can be improved. Further, a fouling material deposited onto the surface of a filtration membrane is crushed and separated from the filtration membrane.