Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1992-08-26
1994-11-22
Cintins, Ivars
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210639, 210651, 210665, 210669, 210682, 210688, 210694, C02F 900
Patent
active
053666348
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 filter pressing. 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.
REFERENCES:
patent: 4313830 (1982-02-01), Tulin et al.
patent: 4670150 (1987-06-01), Hsiung et al.
L. P. Buckley et al., "A Laboratory-Scale Study of a Process for Contaminant Removal and Waste Volume Reduction to Remediate Groundwater Containing Mixed Waste", Paper presented and appeared in the Proceeding of First International Mixed Waste Symposium, Baltimore, Md., Aug. 26-29, 1991.
L. P. Buckley et al., "Treatment of Groundwater and Soil-Wash Leachate Solutions Containing Mixed Waste Contaminants", Paper submitted for presentation and inclusion in the Proceedings of SPECTRUM '92: Nuclear and Hazardous Waste Management International Meeting, Boise, Id., Aug. 23-27, 1992.
Buckley Leo P.
Vijayan Sivaraman
Wong Chi F.
Anderson Thomas G.
Cintins Ivars
Moser William R.
Park Daniel D.
The United States of America as represented by the United States
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