Bioremediation of chromium solutions and chromium containing wastewaters. (3rd July 2016)

• Record Type: Journal Article
• Authors: Malaviya, Piyush; Singh, Asha
• Is Part Of: Critical reviews in microbiology. Volume 42:Number 4(2016)
• Page Start: 607
• Page End: 633
• Publication Date: 2016-07-03
• Subjects: Bacteria -- bioremediation -- chromium -- treatment -- wastewater; Microbiology -- Periodicals; Microbiology -- Periodicals; Review Literature -- Periodicals; 579
• DOI: 10.3109/1040841X.2014.974501
• Languages: English
• ISSNs: 1040-841X

Abstract

Abstract: Cr(VI) represents a serious threat to human health, living resources and ecological system as it is persistent, carcinogenic and toxic, whereas, Cr(III), another stable oxidation state of Cr, is less toxic and can be readily precipitated out of solution. The conventional methods of Cr(VI) removal from wastewaters comprise of chemical reduction followed by chemical precipitation. However, these methods utilize large amounts of chemicals and generate toxic sludge. This necessitates the need for devising an eco-technological strategy that would use the untapped potential of the biological world for remediation of Cr(VI) containing wastewaters. Among several viable approaches, biotransformation of Cr(VI) to relatively non-toxic Cr(III) by chromium resistant bacteria offers an economical- and environment-friendly option for its detoxification. Various studies on use of Cr(VI) tolerant viable bacterial isolates for treatment of Cr(VI) containing solutions and wastewater have been reported. Therefore, a detailed account of mechanisms and processes involved in bioreduction of Cr(VI) from solutions and wastewaters by bacterial isolates are the focus of this review article in addition to a discussion on toxicity of Cr(VI) on bacterial strains and various factors affecting Cr(VI) bioreduction.