PURE WATER PRODUCTION METHOD AND PURE WATER PRODUCTION APPARATUS

WIPO Patent Application WO/2022/259599

A1

The purpose of the present invention is to provide a pure water production method and a pure water production apparatus, which make it possible to prevent the increase in an ion load during a pure water production process, improve the efficiency of a biological treatment and reduce the generation amount of pulverized coal in a method for treating oxidation-treated water in which urea is oxidized and decomposed with a hypohalous acid with biological activated carbon. Provided is a pure water production method comprising: an oxidation treatment step for adding a hypohalous acid to urea-containing water of interest and performing an oxidation treatment of the urea in an oxidation treatment apparatus (10); and a biological treatment step for measuring the concentration of residual chlorine in the oxidation-treated water, then adding hydrogen peroxide to the oxidation-treated water depending on the measured concentration of the residual chlorine, and then performing a biological treatment of the hydrogen-peroxide-added water with biological activated carbon in a biological treatment apparatus (12).

WO/2008/010770	A METHOD AND DEVICE FOR PURIFYING WASTEWATER
JPH0629696	[Name of device] Sewage purification device
JPS5265967	PURIFYING TANK FOR SEWAGE TREATMENT

YUI HIRONORI (JP)
SUGA KENTA (JP)
YOSHIDA ISSEI (JP)
SUDO FUMIO (JP)

PCT/JP2022/002121

December 15, 2022

January 21, 2022

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ORGANO CORP (JP)

C02F3/06; C02F1/70; C02F1/76; C02F3/10

JP2012011356A	2012-01-19
JPH1147770A	1999-02-23
JP2010531724A	2010-09-30
JP2000288578A	2000-10-17
JP2011183275A	2011-09-22

YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)

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