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Comparative study of Cr(VI) uptake and reduction in industrial effluent by Ochrobactrum intermedium and Brevibacterium sp.

Two chromium-resistant bacterial strains, CrT-1 and CrT-13, tolerant up to 40mg K₂CrO₄ ml⁻¹ on nutrient agar, 25mgml⁻¹ in nutrient broth, and up to 10mgml⁻¹ in acetate-minimal media, were identified as Ochrobactrum intermedium and Brevibacterium sp., respectively, on the basis of 16S rRNA gene sequencing. Uptake of chromate was greater in living cells than in heat-killed on dried cells. CrT-1 reduced 82%, 28% and 16% of Cr(VI) at 100, 500, and 1000μgml⁻¹ after 24h while CrT-13 reduced 41%, 14% and 9%. Other heavy metals at low concentrations did not affect these reductions. At 150 and 300μgml⁻¹ in an industrial effluent sample Cr(VI) was reduced by 87% and 71%, respectively, with CrT-1 and by 68% and 47% with CrT-13.

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1. Department of Botany, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan

   Muhammad Faisal & Shahida Hasnain

1. Muhammad Faisal
2. Shahida Hasnain

Correspondence to Shahida Hasnain.

Revisions requested 17 May 2004; Revisions received 2 July 2004

Faisal, M., Hasnain, S. Comparative study of Cr(VI) uptake and reduction in industrial effluent by Ochrobactrum intermedium and Brevibacterium sp.. Biotechnol Lett 26, 1623–1628 (2004). https://doi.org/10.1007/s10529-004-3184-1

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• Received: 06 May 2004

• Accepted: 06 September 2004

• Issue Date: November 2004

• DOI: https://doi.org/10.1007/s10529-004-3184-1

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