Method and apparatus to detoxify aqueous based hazardous waste

Details Method and apparatus to detoxify aqueous based hazardous waste Method and apparatus to detoxify aqueous based hazardous waste

C - Chemistry, Metallurgy

02

F

C02F 9/00 (2006.01) B01D 11/04 (2006.01) B01D 61/16 (2006.01) C02F 1/26 (2006.01) C02F 1/28 (2006.01) C02F 1/38 (2006.01) C02F 1/44 (2006.01) C02F 1/68 (2006.01) C22B 3/20 (2006.01) C22B 3/26 (2006.01)

Patent

CA 2097520

ABSTRACT A process and apparatus is provided in which aqueous based wastes are processed (100, 200, 300) to remove solids (100, 102, 110, 112), decant phase separated product (200, 202), optimize chemically for solvent extraction (208, 304), remove toxic metals (309, 302) and organics via solvent extraction (208, 304) and remove residual metals and organics via flocculation/filtration (308) and adsorption with activated carbon (316). The system employs chemical optimization of the aqueous waste stream by the addition of reagents (114, 116) to optimize subsequent treatment and the addition of chelating agents (114, 116) which inhibit the precipitation of heavy metals so that they are maintained in the waste stream as an organometallic complex which can be extracted via carbon dioxide extraction (200, 202, 214) and concentrated for recovery (104), recycling (104, 206, 320) or final disposal (104, 206, 306).

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