Aerobic hexavalent chromium reduction by Acenetobacter calcoacitlcus

摘要

Rapid industrialization and development of chemical and mining industries in Sukinda mining area, district of Jajpur, Orissa has drawn worldwide attention as one of the most polluted area with hexavalent chromium due to chromite rich. It is pertinentmention that hexavalent chromium Is highly toxic to living beings including the flora & fauna around Sukinda mining area. On account of that, an attempt has been made in the present investigation to detoxify Cr(VI) by employing a lyophilized Gram-negative bacteria i.e. A. calcoacitlcus isolated from that area. It was observed that A. calcoaceticus tolerated 10OOppm of hexavalent chromium. It shown 78.03% hexavalent chromium reduction when incubated in a nutritive medium at 30deg C for 24 hours at pH 7 and the rate of reduction decreased from 78.03 to 38.1 % in a nonnutritive medium.Then the bacteria was selected for parametric studies and observed to exhibit highest reduction 85% at pH 8.0, temperature 30/ 24 hours. Therefore, A. calcoaceticus may be used for bioremediation of hexavalent chromium toxicity in different chromium contaminated sites.