Influence Factors on Bioreducing U(VI) by S.oneidensis

Abstract

Impact Factors of reducing U(VI) by the Shewanella oneidensis(S. oneidensis) were studied in this study. The results showed U(VI) could be reduced effectively at anaerobic environment by S. oneidensis. AQS with concentration of 1.0 mmol/L is an effective accelerator for U(â…¥) bioreduction. U(VI) initial concentration has the very big influence on reduction of U(VI). Some toxic organic compounds, such as toluenes, trichloroacetic acid and maleic acid, are available to reduce U(VI) efficiently by S. oneidensis and being utilized as electron donors at the same time. Sodium lactate with concentration of 10-15 mmol/L effectively accelerated for U(â…¥) bioreduction. Metal ions Cu2+, Mn2+ and Ca2+ impact on the reduction of U(VI). equal concentrations of Cu2+ and Mn2+ could cause varying degrees of inhibition of U(VI) reduction, Ca2+ acted as a weak role in promoting the reduction, the coexisting ions of SO42- did not markedly influence for reduction efficiency of U(VI).