| 摘要 |
PROBLEM TO BE SOLVED: To make apparatuses such as a filtrate tank and a backwashing pump for backwashing a membrane module unnecessary and to reduce expenses for apparatuses, power, and maintenance which are necessary for backwashing. SOLUTION: In a membrane filter device having a plurality of membrane modules 1-6, a liquid passage change-over mechanism for changing over liquid passages is installed to pass filtrate obtained from the other membrane modules 2-6 directly through the membrane module 1 for backwashing.
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