Water treatment apparatus with circulating flow path and water treatment method using the same

摘要

A water treatment apparatus and a water treatment method using the same are provided. The water treatment apparatus includes: a cohesive agent input device (130) configured to input a cohesive agent to raw water; a membrane filtering device (150) including an inlet (152) allowing raw water including the cohesive agent therein to be introduced therethrough, a treated-water discharge opening (156) configured to discharge treated water, and a raw water discharge opening (154) allowing a partial amount of unfiltered raw water to be discharged therethrough; a raw water pump (120) configured to transfer raw water including the cohesive agent to the membrane filtering device (150); a water supply flow path (122) connecting a discharge side of the raw water pump (120) and the inlet (152) of the membrane filtering device (150); a circulation flow path (124) connecting the raw water discharge opening (154) of the membrane filtering device and the water supply flow path (122); and a circulation pump (160) provided in the circulation flow path (124) to transfer discharged raw water to the inlet (152).