Waste water treatment process using improved recycle of high den

Details Waste water treatment process using improved recycle of high den Waste water treatment process using improved recycle of high den

1990-03-05

1991-08-13

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210713, 210714, 210717, 210724, 210912, C02F 152

Patent

active

050394282

ABSTRACT:
An improved process for removing dissolved metals from waste water using a recycle high density sludge is described. Specifically, the process comprises the steps of: (1) treating waste water containing dissolved metals with a recycle stream containing alkaline surface active recycle particles to precipitate the dissolved metals on the surface of the recycle particles; (2) treating a portion of the treated waste water containing metal precipitate solids with an alkaline reagent to form alkaline surface active recycle particles; (3) recycling the alkaline treated stream containing the alkaline surface active particles; and (4) separating the portion of the stream from step (1) not treated with alkaline reagent into a water component which is free of dissolved metals and solids and a sludge component which contains solids. The improved process is further enhanced by using a solids classification step to preferentially separate finer metal precipitate particles, which are treated with an alkaline reagent and recycled, from larger metal precipitate particles, which are discarded.

REFERENCES:
patent: 3575853 (1971-04-01), Gaughan et al.
patent: 3617559 (1971-11-01), Cywin
patent: 4186088 (1980-01-01), Fitch et al.
patent: 4566975 (1986-01-01), Allgulin
patent: 4606829 (1986-08-01), Rice et al.
patent: 4728438 (1988-03-01), Featherstone et al.

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