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公开(公告)号：US20190388840A1
公开(公告)日：2019-12-26
申请号：US16490161
申请日：2017-09-15
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Hidekuni KAMEDA , Kazuki ISHII , Yaozhen CHEN
Abstract: A method for treating water, the method including adding, as coagulants, a polymer compound having a phenolic hydroxyl group and an iron-based coagulant to water to be treated, filtering the coagulated water with a clarification filter, and subjecting the filtered water to a reverse osmosis membrane treatment, wherein the addition of the coagulants is controlled such that a ratio between an addition concentration of the polymer compound having a phenolic hydroxyl group and an addition concentration of the iron-based coagulant is constant.
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