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1. (WO2018138957) METHOD FOR CONTROLLING PH BY ELECTRICAL CONDUCTIVITY

Pub. No.:    WO/2018/138957    International Application No.:    PCT/JP2017/033543
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Sat Sep 16 01:59:59 CEST 2017
IPC: C02F 1/66
B01D 19/00
B01D 61/02
B01D 61/04
B01D 61/12
Applicants: KURITA WATER INDUSTRIES LTD.
栗田工業株式会社
Inventors: IWASAKI, Mamoru
岩▲崎▼ 守
IKUNO, Nozomu
育野 望
Title: METHOD FOR CONTROLLING PH BY ELECTRICAL CONDUCTIVITY
Abstract:
Provided is a method for controlling pH to a neutral region (pH 6-8) by adding an alkali or acid to decarbonated water, wherein the addition amount of the alkali or acid is controlled by using an electrical conductivity meter. The decarbonated water is obtained by decarbonating industrial water or underground water to have a carbonate concentration of 10 ppm or less. The method may further comprise a step for RO-treating the decarbonated water, which has been adjusted to pH 6-8 by the pH control, to produce pure water.