C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
8/48, 182/15.3
C02F 9/00 (2006.01)
Patent
CA 1112581
ABSTRACT OF THE DISCLOSURE 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. Un- dissolved impurities of a predetermined particle size are filtered out. There- after, the waste water is concentrated to a ratio of from about 30/1 to 200/1 by circulating the waste water through a reverse osmosis filtration device, while separating the waste water into a permeate containing excess water and a substantial portion of the remaining impurities including salts and a concent- rate containing substantially all of the vat dyes and a desired amount of water, and by removing the permeate and retaining the concentrate for reuse in the dyeing operation.
306519
Freeman Ernest A.
Teed Richard K.
Riegel Textile Corporation
Smart & Biggar
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