Influence and Mechanism of Cu2+ on Removal of U(VI) by Sulfate Reducing Bacteria
In order to research on the inhibition of Cu2+ to removal of U(Ⅵ) by sulfate reducing bacteria(SRB), the experiment investigated the removal of U(Ⅵ) by SRB through H2S reduction process, elecrton transfer process and adsorption process respectively. The results showed that the electron transfer was the main process in removing of U(Ⅵ) by SRB, It accounted for 80% of the total removal. Extracellular polymeric substances (EPS) adsorption of U(Ⅵ) had little effect. When the concentration of Cu2+ was 5mg/L, Cu2+ had little effect on the removal U(Ⅵ) by SRB; It inhibited the removal of U(Ⅵ) significantly when the concentration was 15mg/L because of the competition of H2S and the electronics of lactic acid between Cu2+ and U(Ⅵ); When the concentration of Cu2+ exceeded 25mg/L, it would damage the integrity of SRB’s membrane and the removal of U(Ⅵ) was completely inhibited.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
Y. L. Liu et al., "Influence and Mechanism of Cu2+ on Removal of U(VI) by Sulfate Reducing Bacteria", Advanced Materials Research, Vols. 236-238, pp. 903-908, 2011