| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a cleaning method capable of facilitating separation of coagulated floc in which adsorbent is bound to coagulant from a membrane surface, and discharging the floc to the outside of a separation membrane module system.SOLUTION: A separation membrane module washing method after filtering raw water to which powder adsorbent and coagulant are added and mixed, includes: filtering the raw water to which only the powder adsorbent is added and mixed at a time of starting filtration; subsequently filtering the raw water to which the powder adsorbent and the coagulant are added and mixed; discharging water on a membrane primary side in a separation membrane module to an outside of a system after ending the filtration steps; discharging back-pressure washing drain water in the separation membrane module while performing back-pressure washing; executing either a step (a) of performing air washing while filling the membrane primary side in the separation membrane module with water, or a step (b) of performing air washing while feeding water to the membrane primary side in the separation membrane module; and subsequently discharging the water on the membrane primary side in the separation membrane module to the outside of the system.</p> |
