Process optimization for bio-beneficiation of a chromite concentrate by a Cr(VI) reducing native microbe (Bacillus sp.)

Agrawal, 2006, Remediation options for the treatment of electroplating and leather tanning effluent containing chromium—a review, Miner. Process. Extr. Metall. Rev., 27, 99, 10.1080/08827500600563319 APHA, 2005 Apte, 2005, Oxidation of Cr(III) in tannery sludge to Cr(VI): field observations and theoretical assessment, J. Hazard. Mater., 121, 215, 10.1016/j.jhazmat.2005.02.010 Beukes, 2010, Theoretical and practical aspects of Cr(VI) in the South African FeCr industry, J. South. Afr. Inst. Min. Metall., 110, 743 Bodas, 2002, Chemical benefication of nickel overburden of Sukinda Mining Corporation, Trans. Indian Inst. Met., 55, 557 Camargo, 2003, Chromate reduction by chromium-resistant bacteria isolated from soils contaminated with dichromate, J. Environ. Qual., 32, 1228, 10.2134/jeq2003.1228 Das, 2010, Biodegradation of the metallic carcinogen hexavalent chromium Cr(VI) by an indigenously isolated bacterial strain, J. Carcinog., 9, 1 Deiana, 2007, Reduction of Cr(VI) by caffeic acid, Chemosphere, 67, 1919, 10.1016/j.chemosphere.2006.12.003 Dey, 2010, Occurrence and evaluation of chromium reducing bacteria in seepage water from chromite mine quarries of Orissa, India J. Water Res. Protoc., 2, 380, 10.4236/jwarp.2010.24044 Dhal, 2010, Reduction of hexavalent chromium by Bacillus sp. isolated from chromite mine soils and characterization of reduced product, J. Chem. Technol. Biotechnol., 85, 1471 Dhal, 2011, Environmental quality of the Boula-Nuasahi chromite mine area in India, Mine Water Environ., 30, 191, 10.1007/s10230-010-0134-0 Dhal, 2013, Characterizing toxic Cr(VI) contamination in chromite mine overburden dump and its bacterial remediation, J. Hazard. Mater, 260, 141, 10.1016/j.jhazmat.2013.04.050 Edison, 2012, Instant green synthesis of silver nanoparticles using Terminalia chebula fruit extract and evaluation of their catalytic activity on reduction of methylene blue, Process. Biochem., 47, 1351, 10.1016/j.procbio.2012.04.025 El Gheriany, 2009, Iron requirement for Mn(II) oxidation by Leptothrix discophora SS-1, Appl. Environ. Microbiol., 75, 1229, 10.1128/AEM.02291-08 Fandeur, 2009, XANES evidence for oxidation of Cr(III) to Cr(VI) by Mn-oxides in a lateritic regolith developed on serpentinized ultramafic rocks of New Caledonia, Environ. Sci. Technol., 43, 7384, 10.1021/es900498r Ganguli, 2002, Bioremediation of toxic chromium from electroplating effluents by chromate-reducing Pseudomonas aeruginosa A2Chr in two bioreactors, Appl. Microbiol. Biotechnol., 58, 416, 10.1007/s00253-001-0871-x Ivarsson, 2011, Chromite oxidation by manganese oxides in subseafloor basalts and the presence of putative fossilized microorganisms, Geochem. Trans., 12, 1 Kapure, 2008, Application of Terminalia chebula for removal of hexavalent chromium in chromite concentrates, ISIJ Int., 48, 868, 10.2355/isijinternational.48.868 Khan, 2009, The effect of regular intake of Terminalia chebula on oxidative stress in mice originated from Salmonella typhimurium, Eur. Asia J. BioSci., 3, 113, 10.5053/ejobios.2009.3.0.15 Liu, 2006, Cr(VI) reduction by Bacillus species isolated from chromium landfill, Process. Biochem., 41, 1981, 10.1016/j.procbio.2006.04.020 Malekzadeh, 2001, Antibacterial activity of black myrobalan (Terminalia chebula Retz) against Helicobacter pylori, Int. J. Antimicrob. Agents, 18, 85, 10.1016/S0924-8579(01)00352-1 McLean, 2000, Isolation and characterization of a chromium-reducing bacterium from a chromated copper arsenate contaminated site, Environ. Microbiol., 2, 611, 10.1046/j.1462-2920.2000.00143.x Nafziger, 1982, A review of the deposits and beneficiation of low-grade chromite, J. South. Afr. Inst. Min. Metall., 27, 205 Okeke, 2008, Environmental and kinetic parameters for Cr(VI) bioreduction by a bacterial monoculture purified from Cr(VI)-resistant consortium, Biol. Trace Elem. Res., 123, 229, 10.1007/s12011-008-8098-7 Patterson, 1985, 467 Puzon, 2005, Formation of soluble organo-chromium(III) complexes after chromate reduction in the presence of cellular organics, Environ. Sci. Technol., 39, 2811, 10.1021/es048967g Qin, 2005, Hexavalent chromium removal by reduction with ferrous sulfate, coagulation and filtration: a pilot-scale study, Environ. Sci. Technol., 39, 6321, 10.1021/es050486p Ramamurthy, 2011, Chrome ore beneficiation challenges and opportunities—a review, Miner. Eng., 24, 375, 10.1016/j.mineng.2010.12.001 Richard, 1991, Aqueous geochemistry of chromium: a review, Water Res., 25, 807, 10.1016/0043-1354(91)90160-R Saleem, 2002, Inhibition of cancer cell growth by crude extract and the phenolics of Terminalia chebula retz, Fruit J. Ethnopharmacol., 81, 327, 10.1016/S0378-8741(02)00099-5 Samuel, 2012, Hexavalent chromium bio-removal through adaptation and consortia development from Sukinda chromite mine isolates, Ind. Eng. Chem. Res., 51, 3740, 10.1021/ie201796s Shao, 2011, Progress in phyto-remediating heavy metal contaminated soils, Soil Biol., 30, 73, 10.1007/978-3-642-21408-0_4 USEPA, 2010 Wang, 2000, Microbial reduction of chromate, 225, 10.1128/9781555818098.ch10