CLEANING METHOD OF SEPARATION MEMBRANE OF MEMBRANE SEPARATION APPARATUS, AND CLEANING SYSTEM

PROBLEM TO BE SOLVED: To provide a cleaning method of a separation membrane of a membrane separation apparatus which can clean a separation membrane sufficiently.SOLUTION: A cleaning method of a separation membrane 9 of a membrane separation apparatus 6 includes: a first cleaning process of supplying acid 31 as a first chemical from a secondary side of the separation membrane 9, cleaning the separation membrane 9, and discharging and collecting a waste liquid 31a of the first chemical after the separation membrane is cleaned from the membrane separation apparatus 6; and a second cleaning process of mixing the waste liquid 31a of the first chemical collected in the first cleaning process with a sodium hypochlorite solution 33 to make a second chemical 57, supplying the second chemical 57 from the secondary side of the separation membrane 9, and cleaning the separation membrane 9.SELECTED DRAWING: Figure 1 【課題】分離膜を十分に洗浄することができる膜分離装置の分離膜の洗浄方法を提供する。【解決手段】膜分離装置６の分離膜９の洗浄方法は、分離膜９の二次側から第一薬液としての酸３１を供給して分離膜９を洗浄し、分離膜を洗浄した後の第一薬液の廃液３１ａを膜分離装置６から排出して回収する第一洗浄工程と、第一洗浄工程で回収された第一薬液の廃液３１ａを次亜塩素酸ナトリウム溶液３３と混合して第二薬液５７とし、第二薬液５７を分離膜９の二次側から供給して分離膜９を洗浄する第二洗浄工程と、を備える。【選択図】図１