Cleaning fluid, detergent, and cleaning method for water-contact member

Abstract

A cleaning fluid and a detergent for water-contact members which both contain free chlorine and a combined-chlorine compound are disclosed, wherein the molar ratio of the total chlorine (Cl2) to the nitrogen atoms N derived from the combined-chlorine compound, Cl2 / N, is 1 or higher, the cleaning fluid having a pH of 9 or higher and the detergent having a pH of 12 or higher. The cleaning fluid can be prepared by diluting the detergent with water. Also provided is a cleaning method for water-contact members, the method comprising using the cleaning fluid to clean a water-contact member.

Description

technical field [0001] The present invention relates to a washing solution, detergent and washing method for washing water-contact members such as UF membrane (ultrafiltration membrane), MF membrane (microfiltration membrane), filter, piping, pressure gauge, and flowmeter. Background technique [0002] In the membrane separation device (turbidity removal membrane device) using UF membrane and MF membrane, the separation membrane will adhere to dirt, so the cleaning fluid (water and / or gas) is generally supplied intermittently every 30 seconds to 60 minutes for physical cleaning of the membrane. washing. [0003] Since the dirt that cannot be removed even with this physical washing is deposited on the membrane, the filtration capacity of the membrane gradually decreases. [0004] Therefore, in the turbidity removal membrane device, it is necessary to use medicines regularly or irregularly for medicine washing. [0005] In Patent Document 1, it is described that a membrane t...

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Problems solved by technology

Patent Document 2 does not describe the use of detergents that selectively permeate membranes

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