Examination of Cs tolerant bacteria interaction with Cs+in aqueous solution and soil by using 137Cs tracer

Abstract

The interaction of microorganisms with Cs in aqueous solution and soil is a key for Cs bioremediation as an alternative of physical and chemical remediation and for understanding the Cs mobility in the environment. In the present study, we isolated cesium tolerant bacteria (CsT-tb) strain having very high tolerance level toward Cs, although it has relatively low Cs sorption capacity from the solution. The effect of CsT-tb strain for bioremediation was analyzed by adding CsT-tb strain solution to the broth containing Cs adsorbed soil, revealing the comparable Cs removal with H2S04 treatment. The Cs desorption enhancement from the silt and clay soil fraction by CsT-tb strain showed its potential for Cs bioremediation and important information of Cs migration promoted by microorganism. From the phylogenetic tree of the 16S rDNA, the CsT-tb strain was closely related to Bacillus sp.