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Title:
WATER TREATMENT METHOD AND WATER TREATMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2019/188138
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a water generating method for obtaining a low-concentration permeate by means of a reverse osmosis membrane module by using raw water such as sea water, as well as river water, groundwater, lake water, treated waste water, and so forth that contain salt, and to provide, in particular, a water treatment method and a water treatment apparatus for stably obtaining fresh water at low cost while preventing oxidative degradation of the reverse osmosis membrane module. Provided are: a water treatment method and a water treatment apparatus in which, in a reverse-osmosis-membrane treatment step for obtaining a low-concentration permeate by means of a reverse osmosis membrane module by using raw water such as sea water, as well as river water, groundwater, lake water, treated waste water, and so forth that contain salt, a scale inhibitor is added by determining the optimal adding timing in order to reductively neutralize oxidizing substances contained in water to be treated, which is supplied to the reverse osmosis membrane module.

Inventors:
SAITO KENJI (JP)
TANIGUCHI MASAHIDE (JP)
TAKABATAKE HIROO (JP)
Application Number:
PCT/JP2019/009452
Publication Date:
October 03, 2019
Filing Date:
March 08, 2019
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C02F1/44; B01D61/04; B01D61/08; B01D61/12; B01D65/02; B01D65/08; C02F1/70; C02F5/00; C02F5/12; C02F5/14
Domestic Patent References:
WO2017175657A12017-10-12
WO2016084905A12016-06-02
WO2016084905A12016-06-02
Foreign References:
JP2007152265A2007-06-21
JP2000300966A2000-10-31
JPH09893A1997-01-07
JP2018060300A2018-04-12
Other References:
M. FURUICHI ET AL.: "Over-Eight-year Operation and Maintenance of 40,000 m3/day Seawater RO Plant in Japan", PROC. OF IDA WORLD CONGRESS, 2005, pages SP05 - 209
TADAHIRO UEMURA ET AL.: "Chlorine Resistance of Reverse Osmosis Membranes and Changes in Membrane Structure and Performance Caused by Chlorination Degradation", vol. 57, 2003, THE SOCIETY OF SEAWATER SCIENCE
YOSEF AYYASH ET AL.: "Performance of reverse osmosis membrane in Jeddah Phase I Plant", DESALINATION, vol. 96, 1994, pages 215 - 224
M. NAGAI ET AL.: "SWRO Desalination for High Salinity", PROC. OF IDA WORLD CONGRESS, 2009, pages DB09 - 173
See also references of EP 3778496A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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