(WO 2008/123106) METHOD OF MEMBRANE TREATMENT FOR BALLAST WATER

[PROBLEMS] To provide a method of membrane treatment for ballast water, in which fouling substances derived from mineral components and gelatinous substances adhering to membrane can be securely removed by detachment or decomposition to thereby attain prolonged maintenance of membrane flux. [MEANS FOR SOLVING PROBLEMS] The method of membrane treatment for ballast water is one using membrane treatment unit (1) capable of separating microorganisms of given size or larger, installed in or on the hull of a ship, characterized in that any fouling substances adhering to the membrane surface are dissolved away, decomposed or otherwise removed with the use of a cleaning liquid containing at least one peroxide selected from among hydrogen peroxide, ...