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Title: Waste treatment process for removal of contaminants from aqueous, mixed-waste solutions using sequential chemical treatment and crossflow microfiltration, followed by dewatering

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. 1 fig.
Inventors:
; ;
Issue Date:
OSTI Identifier:
6898167
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-164616
Patent Number(s):
US 5366634; A
Application Number:
PPN: US 7-935328
Contract Number:
W-31109-ENG-38
Resource Relation:
Patent File Date: 26 Aug 1992
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; BENZENE; REMOVAL; CADMIUM; CALCIUM; CESIUM; CHLORINATED ALIPHATIC HYDROCARBONS; IRON; LEAD; STRONTIUM; URANIUM; WASTE WATER; RADIOACTIVE WASTE PROCESSING; WATER TREATMENT; SEPARATION PROCESSES; ACTINIDES; ALKALI METALS; ALKALINE EARTH METALS; AROMATICS; ELEMENTS; HALOGENATED ALIPHATIC HYDROCARBONS; HYDROCARBONS; HYDROGEN COMPOUNDS; LIQUID WASTES; MANAGEMENT; METALS; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; OXYGEN COMPOUNDS; PROCESSING; RADIOACTIVE WASTE MANAGEMENT; TRANSITION ELEMENTS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; WATER 052001* -- Nuclear Fuels-- Waste Processing; 540220 -- Environment, Terrestrial-- Chemicals Monitoring & Transport-- (1990-); 540230 -- Environment, Terrestrial-- Radioactive Materials Monitoring & Transport-- (1990-)