Title:
METHOD AND APPARATUS FOR TREATMENT OF WASTE WATER FROM CATIONIC ELECTRODEPOSITION COATING PROCESS
Document Type and Number:
WIPO Patent Application WO/2002/002212
Kind Code:
A1
Abstract:
A method for treating a waste water from a final washing process in a cationic electrodeposition coating wherein the waste water is received in a receiving/concentrating tank from a final washing tank, the waste water received in the receiving/concentrating tank is supplied to a membrane separation apparatus to separate into a filtrate and a concentrate, and the filtrate is continuously recovered and reused in the final washing process, characterized in that a pH of the waste water is controlled by measuring the pH of the filtrate continuously and adding an acid to the waste water in such a manner that the filtrate has a predetermined range of pH. The method can be employed, in treating a waste water from a final washing process in a cationic electrodeposition coating by using a membrane separation apparatus, for controlling the pH of the waste water continuously with good efficiency and good precision.
Inventors:
ITOH KOURYO (JP)
Application Number:
PCT/JP2001/005577
Publication Date:
January 10, 2002
Filing Date:
June 28, 2001
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
ITOH KOURYO (JP)
ITOH KOURYO (JP)
International Classes:
B01D61/14; B01D61/16; B01D61/22; C02F1/44; C25D13/24; (IPC1-7): B01D61/04; B01D61/16; C02F1/44
Foreign References:
| JPH10183396A | 1998-07-14 | |||
| JPH04256406A | 1992-09-11 | |||
| JPH11342361A | 1999-12-14 | |||
| JPS5192840A | 1976-08-14 | |||
| JPH09234349A | 1997-09-09 | |||
| JP2000263044A | 2000-09-26 |
Other References:
See also references of EP 1295630A4
Attorney, Agent or Firm:
Asamura, Kiyoshi (New Ohtemachi Bldg. 2-, Ohtemachi 2-chome Chiyoda-ku Tokyo, JP)
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