Method of removing metallic impurities from sewage sludge

Details Method of removing metallic impurities from sewage sludge Method of removing metallic impurities from sewage sludge

1979-03-27

1981-01-13

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210758, C02F 152

Patent

active

042448182

ABSTRACT:
A method of removing metallic impurities from sewage sludge wherein the sludge is first acidified in the presence of an oxidizing agent and held to take metallic impurities into solution. The sludge is then treated with a flocculating agent and thickened by removing liquid prior to dilution with an aqueous liquid free from metallic impurities and wherein the sludge is finally dewatered by a mechanical method.

REFERENCES:
patent: 3561598 (1971-02-01), Goldberg
patent: 4038180 (1977-07-01), Talbert

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