Phosphoric acid/lime hazardous waste detoxification treatment pr

Details Phosphoric acid/lime hazardous waste detoxification treatment pr Phosphoric acid/lime hazardous waste detoxification treatment pr

1985-10-28

1987-06-09

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210721, 210725, 210727, 210901, 210904, 210912, 210913, 423 55, 423305, C02F 156

Patent

active

046718826

ABSTRACT:
A process for producing a non-hazardous sludge from an aqueous solution which contains heavy metals comprising the steps of: (a) adding phosphoric acid or an acid phosphate salt to the aqueous solution to precipitate the heavy metals; (b) lowering the pH of the solution to less than about 5.0; (c) adding a coagulant to the solution; (d) raising the pH of the solution to above about 7.0 by the addition of a calcium source; and (e) dewatering the resulting non-hazardous sludge.

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