| 摘要 |
PROBLEM TO BE SOLVED: To provide a cleaning method of high cleaning efficiency capable of selectively and efficiently removing fouling causative substances from a filter membrane as a method for recovering a specific permeable capability of the clogged filter membrane. SOLUTION: The method for cleaning a filter membrane used for a membrane filtration treatment with a high hardness raw water to which ferric chloride is added as a treated water includes an organic acid solution immersion step that immerses the filter membrane in an organic acid solution, an inorganic acid solution immersion step that immerses the filter membrane in an inorganic acid solution, and an oxidizing agent solution immersion step that immerses the filter membrane in an oxidizing agent solution. COPYRIGHT: (C)2011,JPO&INPIT
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