Academic Journals Database
Disseminating quality controlled scientific knowledge

CHARACTERIZATION OF BACILLUS POLYMYXA FROM JAMNAGAR MINE WATER AND BIOBENEFICIATION OF BAUXITE ORE FOR IRON THROUGH SURFACE MODIFICATION

ADD TO MY LIST
 
Author(s): VIJAYA B, JAYALAKSHMI NR AND MANJUNATH K

Journal: International Journal of Microbiology Research
ISSN 0975-5276

Volume: 3;
Issue: 2;
Start page: 85;
Date: 2011;
VIEW PDF   PDF DOWNLOAD PDF   Download PDF Original page

Keywords: Chemo-organotroph | Physico-chemical changes | zeta-potential | bauxite ore | dissolution | electrophoretic mobility | biobeneficiation | bioleaching

ABSTRACT
Preliminary screening of the mine water sample from bauxite ore deposits in Jamnagar, India showed thepresence of heterotrophic bacteria B.polymyxa. Growth conditions for the bacteria to bring about maximum beneficiationwere standardized by using the enriched Bromfield medium. B.polymyxa brought significant changes in the surfacemodifications of the mineral magnetite. The interaction resulted in surface chemical changes both on the cell and on themineral surface by studying their electrophoretic mobility using Zeta meter 3.0. Dissolution studies in the presence ofmicroorganisms establish the foundation in which these processes could be used for the utility of beneficiation in the efficientseparation of the impurities from the ore, thus confirmed that B.polymyxa has greater affinity towards magnetite and couldbe efficiently used to remove iron from magnetite. Experiments with respect to the bauxite ore was initiated after confirmingthe above result. Iron removal from bauxite ore by B. polymyxa has been demonstrated under 2% sucrose concentrationsbrought about 12.5% removals in four days and under similar conditions the control in absence of B. polymyxa only 6% ironremoval was seen. Thus, B. polymyxa plays a significant role in biobenficiation of bauxite mineral. These observationsclearly indicate that a direct mechanism through bacterial attachment to the ore and an indirect mechanism through leachingwith metabolites are involved in the biobeneficiation process.
Affiliate Program     

Tango Rapperswil
Tango Rapperswil