IMMERSED MEMBRANE FILTRATION METHOD AND IMMERSED MEMBRANE FILTRATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an immersed membrane filtration method and an immersed membrane filtration apparatus by which hypochlorous acid can be added with more efficiency to raw water supplied to a membrane filtration tank in order to wash a membrane module or the like when the raw water supplied to the membrane filtration tank is filtered by the membrane module and is discharged as membrane filtered water.;SOLUTION: When the raw water W supplied to the membrane filtration tank 1 by a raw water supply means B is filtered by the membrane module 2 of a filtration means A immersed in the membrane filtration tank 1 and is discharged as the membrane filtered water T, hypochlorous acid is added by a hypochlorous acid addition means C to the raw water W supplied to the membrane filtration tank 1 and further hypochlorous acid concentration of the membrane filtered water T is measured by a hypochlorous acid concentration measuring means D and based on the measuring result, addition amount of the hypochlorous acid to the raw water W is controlled.;COPYRIGHT: (C)2007,JPO&INPIT