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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.
Inventors:
 [1];  [2];  [1]
  1. (Deep River, CA)
  2. (Pembroke, CA)
Issue Date:
OSTI Identifier:
869612
Assignee:
United States of America as represented by United States (Washington, DC) ANL
Patent Number(s):
US 5366634
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
waste; treatment; process; removal; contaminants; aqueous; mixed-waste; solutions; sequential; chemical; crossflow; microfiltration; followed; dewatering; processes; containing; variety; mixed; treated; remove; addition; chemicals; adsorption; exchange; powdered; materials; including; lead; cadmium; uranium; cesium-137; strontium-85; 90; trichloroethylene; benzene; impurities; iron; calcium; staged; conditioning; solution; produces; polydisperse; size; enlarged; complexes; distinct; configurations; water-soluble; metal; insoluble; precipitation; contaminant-bearing; particles; adsorbent; volume; reduced; separation; cross-flow; low-temperature; evaporation; filter; pressing; water; produced; filtrate; discharged; meets; specified; target; quality; recycled; achieved; powdered materials; water-soluble metal; mixed waste; metal complexes; waste solutions; solutions containing; sorbent material; waste solution; soluble metal; treatment process; metal complex; waste treatment; aqueous waste; chemical treatment; water produced; sorbent materials; insoluble metal; powdered material; /210/