| 摘要 |
A method of operating a separation membrane module having a spiral membrane element formed by winding a bag- like separation membrane, together with a raw water spacer, on the outer peripheral surface of a permeated water collecting tube, comprising the steps of changing the flow direction of raw water in the separation membrane module in the opposite direction regularly or irregularly and performing flushing when the flow direction of the raw water is changed, wherein every first flushing is performed in the reverse direction of the flow direction of the raw water in which the raw water was flowing immediately before the flushing.
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