C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/58 (2006.01) B01D 15/00 (2006.01) B01D 61/14 (2006.01) B01D 61/16 (2006.01) C02F 1/42 (2006.01) C02F 1/44 (2006.01) C02F 1/52 (2006.01) G21F 9/10 (2006.01) C02F 1/28 (2006.01)
Patent
CA 2094103
WASTE TREATMENT PROCESS FOR REMOVAL OF CONTAMINANTS FROM AQUEOUS, MIXED-WASTE SOLUTIONS USING SEQUENTIAL CHEMICAL TREATMENT AND CROSSFLOW MICROFILTRATION, FOLLOWED BY DEWATERING ABSTRACT In processes of this invention aqueous waste solutions containing a variety of mixed waste contaminants are treated to remove the contaminants by a sequential addition of chemicals and adsorption/ion exchange powdered materials to remove the contaminants including lead, cadmium, uranium, cesium-137, strontium-85/90, trichloroethylene and benzene, and impurities including iron and calcium. Staged conditioning of the waste solution produces a polydisperse system of size enlarged complexes of the contaminants in three distinct configurations: water-soluble metal complexes, insoluble metal precipitation complexes, and contaminant-bearing particles of ion exchange and adsorbent materials. The volume of the waste is reduced by separation of the polydisperse system by cross-flow microfiltration, followed by low-temperature evaporation and/or filterpressing. The water produced as filtrate is discharged if it meets a specified target water quality, or else the filtrate is recycled until the target is achieved.
Buckley Leo P.
Vijayan Sivaraman
Wong Chi Fun
Finlayson & Singlehurst
Government Of The United States Of America As Represented By The
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