Article : Detoxification Of Potassium Dichromate (Cr+6) ByBacteria Isolated From Chromium-Rich Waste


Detoxification Of Potassium Dichromate (Cr+6) ByBacteria Isolated From Chromium-Rich Waste


Abdulaziz Yahya Algamdi, Sulaiman Ali Alharbi, Milton Wainwright, Samir G. Al-Solaimani

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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