Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1993-04-01
1994-11-01
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210725, 210727, 210728, 210735, 210736, 210917, C02F 156
Patent
active
053605519
ABSTRACT:
A highly colored dye wastewater is treated by a sequence of steps to obtain a color reduction of 90 percent or more. The method requires acidifying the wastewater and adding a cationic flocculant. A reducing agent is then, optionally, added to further reduce the color value of the wastewater and produce an oxidation-reduction potential of at least -200 and, generally, about -400 to -800. The reducing agent is, preferably, either a hydrosulfite or both a bisulfite and an alkali metal borohydride.
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Crompton & Knowles Corporation
Crowe Bernard F.
Hruskoci Peter A.
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