WATER TREATMENT METHOD AND WATER TREATMENT DEVICE USING REVERSE OSMOSIS MEMBRANE

Title:

WATER TREATMENT METHOD AND WATER TREATMENT DEVICE USING REVERSE OSMOSIS MEMBRANE

Document Type and Number:

WIPO Patent Application WO/2020/179789

Kind Code:

A1

Abstract:

Provided is a water treatment method that, in water treatment using a polyamide-based reverse osmosis membrane, can stably perform the treatment by performing sterilization while inhibiting a decrease in the amount of passed water, when a stabilized hypobromous acid composition is used. This water treatment method using a reverse osmosis membrane includes an intermittent addition step for intermittently adding a stabilization composition containing a bromine-based oxidizing agent and a sulfamic acid compound to water to be treated by a reverse osmosis membrane treatment device using a polyamide reverse osmosis membrane, wherein the intermittent addition step involves repeating of an addition period during which a reverse osmosis membrane treatment is performed while the stabilization composition is added to the water being treated, and a non-addition period during which a reverse osmosis membrane treatment is performed without addition of the stabilization composition to the water being treated, the addition period is in the range of 0.25-12 hours, the non-addition period is in the range of 3-320 hours, the addition period is 12 hours or less within any 24-hour period, and the total chlorine concentration of the water being treated during the addition period is in the range of 0.2-2.0 mg/L.

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Inventors:

SUZUKI YUDAI (JP)
YOSHIKAWA HIRO (JP)

Application Number:

PCT/JP2020/008929

Publication Date:

September 10, 2020

Filing Date:

March 03, 2020

Export Citation:

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Assignee:

ORGANO CORP (JP)

International Classes:

B01D61/10; B01D61/12; B01D65/02; B01D65/06; B01D71/56; C02F1/44; C02F1/50; C02F1/76

Domestic Patent References:

WO2018142904A1	2018-08-09
WO2005019117A1	2005-03-03

Foreign References:

JP2016120466A	2016-07-07
JP2018015679A	2018-02-01
JP2016538119A	2016-12-08

Attorney, Agent or Firm:

YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)

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