MEMBRANE WASHING METHOD AND MEMBRANE WASHING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a membrane washing method and a membrane washing apparatus capable of stably maintaining a membrane filtration operation without reducing the permeation performance of a membrane. SOLUTION: The membrane washing method for processing a treating water by membrane filtration comprises: a membrane filtration process of filtering the treating water with a membrane; a reverse flow washing process of reversely washing the membrane by reversely flowing a filtrated water in a direction opposite to that of the filtration after the membrane filtration process; and a chemical-added reverse flow washing process of reversely washing the membrane by adding chemicals to the membrane-filtrated water after repeating the membrane filtration process and the reverse flow washing process a predetermined number of times or responding to the clogging of the membrane, wherein the washing of the membrane is performed in the chemical-added reverse flow washing process by an acid-added reverse flow washing process using an acid for a chemical to be added in combination with a reducing agent-added reverse flow washing process using a reducing agent for a chemical to be added. COPYRIGHT: (C)2009,JPO&INPIT