Bioremediation of Cr (VI) from industrial effluents using Bacillus mojavensis C6: Process of optimization and application

Abstract

Microbial bioremediation of heavy metals have received tremendous attention due to their significant in purification of various kinds of wastewaters. Bacillus mojavensis C6 which was isolated from industrial wastewater exhibit significant effect on bio-removal process of Cr (VI). The Plackett– Burman design was used to identify the effect of eight variables on bacterial resistance toward Cr (VI). Using central composite design, the optimum values of each variable for heavy metal resistance were as follows: pH 7.0, incubation temperature 30°C, agitation speed 100 rpm and incubation period 24 h for Cr (VI) removal. The heavy metals resistant bacterial strain was used in removal of Cr (VI) from industrial wastewater sample. There are significant biosorption of Cr (VI) from the industrial waste water sample by Bacillus mojavensis C6 and the biosorbent can be regenerated and reused for further bioremediation of heavy metals-contaminated water. It can be concluded that Bacillus mojavensis C6 can be considered a potential biotechnological agent for the removal of Chromium ions from industrial effluents.