Performance of autohydrogenotrophic bac- teria for bio-reduction of selenate （Se（VI）） under anaerobic conditions was investigated with batch experiments. Results showed Se（VI） was bio-reduced to selenite （Se（I...Performance of autohydrogenotrophic bac- teria for bio-reduction of selenate （Se（VI）） under anaerobic conditions was investigated with batch experiments. Results showed Se（VI） was bio-reduced to selenite （Se（IV）） as an intermediate product, and then to elemental selenium （Se）. Reduction kinetics could be described by the pseudo-first-order model. In particular, the influences of pH value and temperature on Se（VI） reduction by autohydrogentrophic organisms were examined. The high degradation rate was achieved at pH 7.0 to 8.0; and the best reduction temperature was between 25℃ and 35℃. This study is of help for treating groundwater with selenium contamination by autohydrogenotrophic bacteria as well as its reactor development.展开更多
文摘Performance of autohydrogenotrophic bac- teria for bio-reduction of selenate （Se（VI）） under anaerobic conditions was investigated with batch experiments. Results showed Se（VI） was bio-reduced to selenite （Se（IV）） as an intermediate product, and then to elemental selenium （Se）. Reduction kinetics could be described by the pseudo-first-order model. In particular, the influences of pH value and temperature on Se（VI） reduction by autohydrogentrophic organisms were examined. The high degradation rate was achieved at pH 7.0 to 8.0; and the best reduction temperature was between 25℃ and 35℃. This study is of help for treating groundwater with selenium contamination by autohydrogenotrophic bacteria as well as its reactor development.
