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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 10, No. 4, 2013, pp. 709-718
Bioline Code: st13070
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 10, No. 4, 2013, pp. 709-718

 en Biotransformation potential of hexavalent chromium by Bacillus pumilus check for this species in other resources -S4, Pseudomonas doudoroffii check for this species in other resources -S5 and Exiguobacterium check for this species in other resources -S8 in association with hydrophytes
Ejaz, S.; Rizvi, F.Z.; Anwar, S. & Faisal, M.

Abstract

Three chromium-resistant bacteria Bacillus pumilus check for this species in other resources -S4, Pseudomonas doudoroffii check for this species in other resources -S5 and Exiguobacterium check for this species in other resources -S8 were isolated from chromium-contaminated wastewater/soil and could resist very high concentrations of potassium chromate in Luria agar (up to 25 mg ml-1) and acetate minimal medium (2 mg ml-1). The strains showed growth at diverse pH and temperatures and could resist multiple heavy metals. Pseudomonas doudoroffii-S5 reduced (8.27 mg hexavalent chromium 24 h-1) at a lower initial potassium chromate concentration (100 μg ml-1), but overall more chromate (28.4 mg hexavalent chromium 24 h-1) was reduced at a higher initial concentration (1,000 μg ml-1). The addition of various heavy metals (zinc sulphate, copper sulphate, and manganese sulphate at 50 μg ml-1) in the chromium reduction media did not significantly affect the hexavalent chromium reduction potential of these isolates. The chromium removal/detoxification potential of these strains increased when used in conjunction with hydrophytes Eichornia crassipes check for this species in other resources and Pistia stratiotes check for this species in other resources . Interestingly, the whole process runs automatically with less energy input, that is, the bacterial strains support the growth of plant while in turn the plant releases exudates that help bacterial growth.

Keywords
Bioremediation; Eichornia crassipes; Heavy metals; Pistia stratiotes

 
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