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

Patent · Tue Nov 22 00:00:00 EST 1994

OSTI ID:6898167

Vijayan, S; Wong, C F; Buckley, L P

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.

• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): US 5366634; A
• Application Number: PPN: US 7-935328
• OSTI ID: 6898167
• Resource Relation: Patent File Date: 26 Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

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-)