Bioremediation of chromium (VI) contaminated solid residues

Details Bioremediation of chromium (VI) contaminated solid residues Bioremediation of chromium (VI) contaminated solid residues

1990-04-03

1992-10-13

Naff, David M.

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Destruction of hazardous or toxic waste

435170, 435245, 435821, 210601, 210610, 210611, 588256, C12P 104, C12N 136, C02F 300

Patent

active

051550423

ABSTRACT:
Chromium in solid waste residues may be immobilized by reduction of essentially all of the Cr(VI) to insoluble Cr(III). The Cr(VI) is separated from the solids by contacting with an acid to produce an aqueous solution having a pH of about 6.5 to 9.5, then adding sulfate-reducing anaerobic bacteria and, as required, a source of sulfates and nutrients for the growth of the bacteria. Where the solid residues are below the surface of the soil, a continuous recirculation may be established to extract Cr(VI), treat the resulting solution above grade to reduce Cr(VI) to Cr(III), and return the treated solution to the soil.

REFERENCES:
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R. H. Smillie, K. Hunter & Margaret Loutit, "Reduction of Chromium (VI) by Bacterially Produced Hydrogen Sulphide in a Marine Environment Water Research", 15, 1351-54 (1981).

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