Bioremediation of chromium (VI) contaminated aqueous systems by

Details Bioremediation of chromium (VI) contaminated aqueous systems by Bioremediation of chromium (VI) contaminated aqueous systems by

1990-03-20

1991-11-05

Dawson, Robert A.

Liquid purification or separation

Processes

Treatment by living organism

210631, 210720, 210724, 210913, 435262, C22F 162

Patent

active

050629565

ABSTRACT:
A method of reducing soluble Cr(VI) levels in aqueous wastes from 200 ppm or more to less than 1 ppm, particularly to less than 0.05 ppm, preferably to less than 0.01 ppm, uses fermentative sulfate-reudcing anaerobic bacteria to reduce Cr(VI) to Cr(III) and immobilize the latter as the extememly insoluble hydroxide. The process is readily adapted to operate continuously using a bioreactor containing sludge with sulfate-reducing anaerobic bacteria and operated as a chemostat.

REFERENCES:
patent: 3941691 (1976-03-01), Romanenko et al.
patent: 4260491 (1981-04-01), Cassidy et al.
patent: 4468461 (1984-08-01), Bopp
patent: 4522723 (1985-06-01), Kauffman et al.
patent: 4701261 (1987-10-01), Gibbs et al.
patent: 4758344 (1988-06-01), Wildenauer
patent: 4789478 (1988-12-01), Revis et al.
patent: 4839052 (1989-06-01), Maree
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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