公开(公告)号：US20180370825A1

公开(公告)日：2018-12-27

申请号：US16064860

申请日：2016-09-20

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Yasuhiro OOI ,  Keijirou TADA ,  Akihiro FUJII

IPC: C02F1/56 ,  B01D21/01 ,  B01D61/04 ,  B01D61/16 ,  B01D61/58 ,  C02F1/44

Abstract: Provided are a method and an apparatus for clarifying industrial water that enable industrial water to be clarified to a high degree with a small amount of coagulant instead of an inorganic coagulant, such as PAC, aluminum sulfate, or ferric chloride, which need to be used in a large amount for clarifying industrial water and are capable of producing treated water having qualities particularly suitable for an RO membrane treatment. The method for clarifying industrial water includes adding a melamine-formaldehyde resin acid colloidal solution to industrial water in order to coagulate the industrial water and subsequently filtering the coagulated water. The coagulated water may be directly filtered with a pressure or gravity filtration device, or with a microfiltration or ultrafiltration membrane module, without being subjected to solid-liquid separation using a sedimentation or floatation separation device prior to the filtration treatment.