Sonoassisted Microbial Reduction of Chromium |
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Authors: | Mathur Nadarajan Kathiravan Ramalingam Karthick Naggapan Muthu Karuppan Muthukumar Manickam Velan |
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Institution: | (1) Department of Chemical Engineering, A.C. College of Technology, Anna University, Chennai, 600 025, India;(2) Department of Biotechnology, Holy Cross College, Trichy, 620002, India; |
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Abstract: | This study presents sonoassisted microbial reduction of hexavalent chromium (Cr(VI)) using Bacillus sp. isolated from tannery effluent contaminated site. The experiments were carried out with free cells in the presence and
absence of ultrasound. The optimum pH and temperature for the reduction of Cr(VI) by Bacillus sp. were found to be 7.0 and 37 °C, respectively. The Cr(VI) reduction was significantly influenced by the electron donors
and among the various electron donors studied, glucose offered maximum reduction. The ultrasound-irradiated reduction of Cr(VI)
with Bacillus sp. showed efficient Cr(VI) reduction. The percent reduction was found to increase with an increase in biomass concentration
and decrease with an increase in initial concentration. The changes in the functional groups of Bacillus sp., before and after chromium reduction were observed with FTIR spectra. Microbial growth was described with Monod and Andrews
model and best fit was observed with Andrews model. |
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