Bioremediation of Cr (VI) from Tannery effluent using Bacillus spp and Staphylococcus spp

Abstract

In the present study, biosorption of Chromium by microorganisms from tannery effluent were investigated. The efficient bacteria isolated from tannery effluent were identified as Bacillus spp and Staphylococcus spp. The effect of pH and temperature on the biosorption capacity was investigated. The optimum pH and temperature was found to be pH 7 and 37ºC for Bacillus spp followed by Staphylococcus spp, the optimum pH was 8 and temperature 37ºC respectively. The maximum adsorption of Chromium (86.4 mg/L) was showed by Bacillus spp and Staphylococcus spp showed 70.6 mg/L at an initial concentration of 100 mg/L. Both the isolates exhibited high resistance to heavy metals with minimum inhibitory concentration (MIC) for heavy metals ranging from 0.05 mg/L to 5 mg/L. Minimum inhibitory concentration of Cr (VI) resistant Bacillus spp 3.8 mg/L and Staphylococcus spp were 2.5 mg/L respectively.