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Study on removing selenate from groundwater by autohydrogenotrophic microorganisms |
Siqing XIA( ), Shuang SHEN, Jun LIANG, Xiaoyin XU |
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract Performance of autohydrogenotrophic bacteria 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 (Se0). 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°C and 35°C. This study is of help for treating groundwater with selenium contamination by autohydrogenotrophic bacteria as well as its reactor development.
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Keywords
autohydrogenotrophic
selenate
hydrogen
groundwater
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Corresponding Author(s):
XIA Siqing,Email:siqingxia@tongji.edu.cn
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Issue Date: 01 August 2013
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