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Title: REMOVAL OF RADIONUCLIDES BY BASILLUS POLYMYXA IMV 8910 FROM AQUEOUS SOLUTION

Author: I. Leshchuk and N. Klymenko

Year: 2009

Publisher: European Water Resources Association (EWRA)

Description:

This study focuses on the removal of such radionuclides, as uranium (VI), strontium and cesium by Bacillus polymyxa IMV 8910 from aqueous solutions. It is shown that U(VI) and Sr are effectively sorbed by bacteria, but cesium was not concentrated by one. Uptake capacity of biomass is characterized by high values obtained even with low metal concentration in solution. Both processes of U (VI) and Sr sorption by B. polymyxa IMV 8910 can be described well by the Langmuir isotherm with amax = 1000 μmol/g, k = 11.11, R = 0.992 and amax = 435 μmol/g, k = 3.3, R = 0.999, respectively. The optimal range of pH for U (VI) sorption is 4.0-6.0, for Sr2+ – 4.0-8.0. Bivalent alkaline-earth metal cations act as competitors for U (VI) and Sr biosorption. Desorption efficiency increases in the
order: dH2O <<< NaHCO3 < EDTA < HCl ≤ MgCl2 ≤ CaCl2 for strontium, and in the order: dH2O < CaCl2 <<< NaOH < H2SO4 < HCl < EDTA < HNO3 ≤ NaHCO3 < Na2CO3 for uranium. Biosorbent can be used for treatment of low charge waste streams, which containing U (VI) and Sr ions.