Reduction of hexavalent chromium by Sphaerotilus natans a filamentous micro-organism present in activated sludges

Journal of Hazardous Materials
Alejandro H CaravelliN E Zaritzky

Abstract

Wastewaters produced by various industries may contain undesirable amounts of hexavalent chromium (Cr(VI)), as chromate and dichromate, a hazardous metal affecting flora and animals of aquatic ecosystems as well as human health. One removal strategy comprises the microbial reduction of Cr(VI) to Cr(III), a less soluble chemical species that is less toxic than Cr(VI). In this work, the ability to reduce Cr(VI) of Sphaerotilus natans, a filamentous bacterium usually found in activated sludge systems, was evaluated. In aerobic conditions, S. natans was able to efficiently reduce Cr(VI) to Cr(III) from dichromate solutions ranging between 4.5 and 80 mg Cr(VI)l(-1) in the presence of a carbonaceous source. A simultaneous evaluation of the microbial respiratory activity inhibition was also carried out to analyze the toxic effect of Cr(VI). Cr(VI) reduction by S. natans was mathematically modeled; chromium(VI) reduction rate depended on both Cr(VI) concentration and active biomass concentration. Although it is known that S. natans removes heavy metal cations such as Cr(III) by biosorption, the ability of this micro-organism to reduce Cr(VI), which behaves as an oxyanion in aqueous solutions, is a novel finding. The distinctive capacit...Continue Reading

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Citations

Oct 31, 2014·Critical Reviews in Microbiology·Piyush Malaviya, Asha Singh
May 5, 2009·Journal of Hazardous Materials·Ashwini C Poopal, R Seeta Laxman
Apr 7, 2009·Journal of Hazardous Materials·Alejandro H Caravelli, Noemí E Zaritzky
Apr 1, 2011·Saudi Journal of Biological Sciences·M S Mary MangaiyarkarasiB V R Tata
Apr 2, 2009·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Li Y ChaiYue H Chen
Jul 7, 2019·Environmental Science and Pollution Research International·Ponnambalam Ragini YaashikaaAnbalagan Saravanan
Nov 21, 2009·Environmental Science & Technology·Madan TandukarSpyros G Pavlostathis

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