Purification of waste water from sulphate pulp bleaching plants

Details Purification of waste water from sulphate pulp bleaching plants Purification of waste water from sulphate pulp bleaching plants

1975-04-22

1976-11-09

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 28, 210 32, 210 51, 162 30R, 162DIG8, C02B 152

Patent

active

039909697

ABSTRACT:
A process for decoloring an aqueous effluent from the bleaching of sulphate pulp with chlorine or chlorine containing compounds, said effluent containing dark colored lignin degradation products, said bleaching including at least one alkali extraction stage, comprises
A. treating the aqueous effluent from at least one alkali extraction stage in the bleaching with at least one acid selected from the group consisting of sulphuric acid, sulphurous acid and hydrochloric acid until a precipitate forms, said precipitate consisting essentially of dark colored lignin degradation products and other organic material
B. separating the treated aqueous effluent from the precipitate and
C. contacting the treated aqueous effluent which has been separated from the precipitate with a phenolic resin which is activated by the acidic effluent, said activated resin binding the dark colored lignin degradation products and separating a decolored effluent from the loaded resin.

REFERENCES:
patent: 1859888 (1932-05-01), Richter
patent: 3428520 (1969-02-01), Yiannos
patent: 3652407 (1972-03-01), Paleos
patent: R24213 (1956-09-01), Van Blaricom et al.
Rohm & Haas Technical Bulletin; "Decolorization of Kraft Pulp Bleaching Effluents Using Amberlite XAD-8 Polymeric Adsorbent", 8/71.

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