The following nine dichromate resistant bacteria were isolated from chromium-rich waste: Bacillus cereus, Bacillus pumilus, Bacillus licheniformis, Bacillus subtilis, Acinetobacter radioresistens, Acinetobacter venetianus, Ochrobacterumsp, Massilianiabensis, and Leucobacterchromiireducens. All of the isolates absorbed and reduced potassium dichromate Cr6+ from the growth medium amended with dichromate Cr6+ at a concentration of 100 ppm. The adsorption of Cr6+ from the growth medium by bacteria increased with increasing incubation time from 0 to 24, 48, 72 and 96 h. The highest dichromate reduction was achieved by Acinetobacter radioresistens,with 62% reduction, followed byAcinteobacterventianus, with54%and Bacillus cereus with a 50% reduction. In the case of all isolates, the amount of Cr6+remaining in the growth medium decreased gradually over the 96 h incubation period.
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