Process for purifying dyeing wastewaters

Details Process for purifying dyeing wastewaters Process for purifying dyeing wastewaters

1987-01-30

1988-07-19

Therkorn, Ernest G.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210654, 210655, 210917, B01D 1300, C02F 144

Patent

active

047583479

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.

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Chemical Abstracts, vol. 75 (1971)-7726y Concentration of Sugar-Containing Solutions.
Lacey, Robert et al., Industrial Processing with Membranes, Wiley-Interscience, N.Y., 1972, pp. 211-213, 219, 220.
H. Stratman et al., "Membranen in der Verfahrenstechik", pp. 581-596.
W. Pusch et al., "Synthetische Membranen-Herstellung, Struktur und Anwendung", pp. 670-695.

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