| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cleaning a separation membrane module by a liquid chemical, the method by which a great cleaning effect can be exhibited and the amount of the liquid chemical to be discharged can be cut down remarkably. SOLUTION: The separation membrane module is cleaned by repeating twice or more the steps of: supplying the liquid chemical to the separation membrane module; bringing the liquid chemical into contact with the separation membrane module by a technique for circulating the liquid chemical or settling/immersing the separation membrane module in the liquid chemical for a predetermined time; withdrawing a part or the whole of used liquid chemical; supplying the liquid chemical again to the separation membrane module; bringing the liquid chemical into contact with the liquid chemical; then withdrawing a part or the whole of used liquid chemical. COPYRIGHT: (C)2006,JPO&NCIPI
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