Microbial biotechnology for remediation of aquatic habitats polluted with chromium
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2008, Vol 1, Issue 2
Abstract
Chromium may occur in nine different forms of oxidation ranging from –II to +VI, with forms II, III and VI as the most commonly encountered. In Cluj county, chromium pollution dates well back in time and has caused important dysfunction to the mechanical-biological wastewater purification station of the city of Cluj (Coșier & Diță 1996). The purpose of this study was to develop one microbial method able to reduce hexavalent chromium (mobile, permeable to cell membrane, carcinogenic and mutagenic) (Ishikawa et al 1994) to the trivalent form (insoluble and an essential element for humans) (Song et al 2006). Different sources of chromium-reducing bacteria and many sources of carbon and energy added to the Kvasnikov mineral basal medium (Komori et al 1990) with increasing amount of chromate (200-1000 mg/l) were tested. Two bacterial strains, able to reduce even 1000 mg chromate/l, were isolated in pure culture. For one of these bacterial strains, we determined the optimum conditions for the reduction of Cr (VI).
Authors and Affiliations
Viorica Coșier, Valentin Petrescu-Mag
Keywords
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