Fixation and stabilization of chromium in contaminated materials

Details Fixation and stabilization of chromium in contaminated materials Fixation and stabilization of chromium in contaminated materials

1993-08-13

1995-03-14

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210720, 210724, 210726, 210751, 210757, 210913, 405129, 423 55, 588256, C02F 162

Patent

active

053974786

ABSTRACT:
A highly flexible multi-step treatment technology for chemical fixation and stabilization of leachable chromium, particularly hexavalent chrome, in contaminated soils, solid wastes, concrete, sludge, sand and gravel and waste waters is disclosed. The process comprises reducing hexavalent chromium to chromous (Cr.sup.2+) and chromic (Cr.sup.3+) forms in the presence of water under alkaline conditions and fixing the reduced chromium forms with phosphate.
The process reduces Toxicity Characteristic Leaching Procedure chromium levels below the regulatory threshold of 5 mg/l as required by the USEPA.

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