Process of treating waste water from a textile vat dyeing operat

Details Process of treating waste water from a textile vat dyeing operat Process of treating waste water from a textile vat dyeing operat

1977-07-05

1979-08-21

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210321R, 210433M, 8 38, 8 81, B01D 1300, B01D 3100

Patent

active

041652886

ABSTRACT:
Process of treating waste water from a textile vat dyeing operation containing water, vat dyes, and dissolved and undissolved impurities including salts, lint, foreign matter, etc. to produce a concentrate suitable for direct reuse in the vat dyeing operation to conserve the use of dyes and water, as follows. Undissolved impurities of a predetermined particle size are filtered out. Thereafter, the waste water is concentrated and filtered down to a concentrate of a ratio of from about 30/1 to 200/1 while removing excess water and a substantial portion of the remaining impurities and retaining substantially all of the vat dyes and a desired amount of water. The latter step is preferably performed by circulating the waste water through a reverse osmosis filtration device, while separating the waste water into a permeate containing excess water an a substantial portion of the remaining impurities including salts and a concentrate containing substantially all of the vat dyes and a desired amount of water, and by removing the permeate and retaining the concentrate for use in the dyeing operation.

REFERENCES:
patent: 3998740 (1976-12-01), Bost et al.
Michaels, "New Separation Technique for the CPI", from Chem. Eng. Progress, vol. 64, No. 12, Dec. 1968, pp. 31-43.
Brandon et al., "Hyperfiltration Pilot Plant for Textile Wastewater Renovation," from American Dyestuff Reporter, Oct. 1975.

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