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Title:
TREATMENT METHOD AND TREATMENT DEVICE FOR WASTEWATER CONTAINING CATIONIC SURFACTANT
Document Type and Number:
WIPO Patent Application WO/2015/002014
Kind Code:
A1
Abstract:
When recovering water by performing a reverse-osmosis-membrane separation treatment on wastewater containing a cationic surfactant such as process wastewater from the electronics industry, the present invention stably obtains high-quality treated water over the long term while preventing blockage of the reverse-osmosis membrane caused by the cationic surfactant. The present invention performs a reverse-osmosis-membrane separation treatment using a first reverse-osmosis-membrane separation device (3) on wastewater containing a cationic surfactant such as process wastewater from the electronics industry after first adjusting the same to a pH of 3-5, performs a reverse-osmosis-membrane separation treatment using a second reverse-osmosis-membrane separation device (4) on permeated water from the first reverse-osmosis-membrane separation device (3) after first adjusting the same to a pH of 6.5-10.5, and recovers the permeated water from the second reverse-osmosis-membrane separation device (4) as treated water.

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Inventors:
IKUNO NOZOMU (JP)
MAEDA YUUSHI (JP)
Application Number:
PCT/JP2014/066629
Publication Date:
January 08, 2015
Filing Date:
June 24, 2014
Export Citation:
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Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C02F1/44; B01D61/02; B01D61/04; B01D61/58; C02F1/28
Foreign References:
JP2006247576A2006-09-21
JPH06328070A1994-11-29
JPH11244853A1999-09-14
JP2000015257A2000-01-18
JPS614591A1986-01-10
JP2007528781A2007-10-18
JP2009260249A2009-11-05
JP2004285354A2004-10-14
JPS6242787A1987-02-24
JPH0663549A1994-03-08
JP2003071252A2003-03-11
JPH1110146A1999-01-19
JP2001205267A2001-07-31
JP2005246158A2005-09-15
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (JP)
Takeshi Shigeno (JP)
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