Phosphoric acid/lime hazardous waste detoxification...

Details Phosphoric acid/lime hazardous waste detoxification... Phosphoric acid/lime hazardous waste detoxification...

C - Chemistry, Metallurgy

02

F

362/55

C02F 1/62 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 9/00 (2006.01)

Patent

CA 1244152

ABSTRACT OF THE DISCLOSURE 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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