To provide a solid-liquid separator for reducing a load on a separation membrane and efficiently removing solids in raw water by restraining sticking of the solids to the membrane surface.
This device is provided with a flocculating and separating part 13 for adding a flocculant to raw water to form flocks, settle and separate them, a fine particle substance mixing part for adding and mixing fine particle substances to treated water at the flocculating and separating part 13, a membrane separation part 15 for separating solids from fine particle substance- mixed water, and a path 16 for returning the fine particle substances separated from the water permeated through the membrane at the membrane separation part 15 to the flocculating and separating part 13.
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OZAWA GENZO
SUZUKI TATSUHIKO
MAEZAWA KOGYO
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