Title:
METHOD OF PURIFYING DYED WASTE WATER
Document Type and Number:
Japanese Patent JPS62186986
Kind Code:
A
Abstract:
There is disclosed a process for purifying/decolorizing dyeing wastewaters that have been adjusted in a pretreatment step to a pH in the range from 4 to 9 by addition of acid or alkali by means of a membrane separation process. The concentrate obtained after the first step is further decolorized and deionized in the second step. The permeate of the second step is recycled to the pretreatment step, while the permeate of the first step and the concentrated wastewater obtained after the second step are disposed of in conventional manner.
Inventors:
ARUFURETSUDO HENTSU
HAINTSU PUFUENINGAA
HAINTSU PUFUENINGAA
Application Number:
JP2493887A
Publication Date:
August 15, 1987
Filing Date:
February 06, 1987
Export Citation:
Assignee:
CIBA GEIGY AG
International Classes:
B01D61/02; C02F1/44; (IPC1-7): C02F1/44
Attorney, Agent or Firm:
Masao Okabe