title: Effect of dissimilatory Fe(III) reducers on bio-reduction and nickel-cobalt recovery from Sukinda chromite-overburden.
abstract: The effect of an adapted dissimilatory iron reducing bacterial consortium (DIRB) towards bio-reduction of Sukinda chromite overburden (COB) with enhanced recovery of nickel and cobalt is being reported for the first time. The remarkable ability of DIRB to utilize Fe(III) as terminal electron acceptor reducing it to Fe(II) proved beneficial for treatment of COB as compared to previous reports for nickel leaching. XRD studies showed goethite as the major iron-bearing phase in COB. Under facultative anaerobic conditions, goethite was reduced to hematite and magnetite with the exposure of nickel oxide. FESEM studies showed DIRB to be associated with COB through biofilm formation with secondary mineral precipitates of magnetite deposited as tiny globular clusters on the extra polymeric substances. The morphological and mineralogical changes in COB, post DIRB application, yielded a maximum of 68.5% nickel and 80.98% cobalt in 10 days using 8M H2SO4.
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India; Academy of Council of Scientific and Innovative Research (AcSIR), India.
authors: Jacintha
authors: J
authors: Esther
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India.
authors: Sandeep
authors: S
authors: Panda
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India.
authors: Sunil K
authors: SK
authors: Behera
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India; Academy of Council of Scientific and Innovative Research (AcSIR), India. Electronic address: suklalb@yahoo.co.in.
authors: Lala B
authors: LB
authors: Sukla
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India; Academy of Council of Scientific and Innovative Research (AcSIR), India.
authors: Nilotpala
authors: N
authors: Pradhan
authors: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751013, India; Academy of Council of Scientific and Innovative Research (AcSIR), India.
authors: Barada K
authors: BK
authors: Mishra
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D018441:Biofilms; D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D013054:Spectrophotometry, Atomic; D013464:Sulfuric Acids / Q000737:chemistry; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D008670:Metals; D013464:Sulfuric Acids; D002857:Chromium; C000499:ferric oxide; D003035:Cobalt; D009532:Nickel; C028007:nickel monoxide; D007501:Iron; C033158:sulfuric acid
keywords: Bio-reduction; Chromite overburden; Dissimilatory iron reducing bacteria; Nickel