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Abstract

There is disclosed a filtration process using at least one hollow fiber membrane module including a large number of porous hollow fibers bundled therein. In the process, the filtration step of passing raw water containing fine particles through the pores of the hollow fibers from the outsides thereof to the insides thereof to thereby trap the fine particles on the outer surfaces of the hollow fibers is followed by the cooling step of lowering the temperature of water inside the hollow fiber membrane module to cool the hollow fibers before the scrubbing step of charging bubbles into water around the outer surfaces of the hollow fibers to vibrate the hollow fibers to thereby exfoliate the fine particles trapped on the outer surfaces of the hollow fibers. The scrubbing step is followed by the drain step of draining the resulting waste water out of the system.

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First Claim