No.30 石炭燃焼プロセスにて排出される排水中のセレン除去(熱分解・コークス(1),灰・微量元素(1))

概要

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Wet flue gas desulfurization (FGD) wastewater discharged from coal combustion process contains some hazardous trace elements, such as selenium, boron, and mercury. The concentration of these hazardous trace elements was sometimes exceeded the effluent standard. In this study, the removal of Se(VI) from the simulated FGD waters by use of bioreduction and TiO_2 photocatalytic reduction were investigated. When the photocatalytic Se(VI) reduction systems were attempted for the simulated FGD waters, the reduction of Se(VI) to Se(0) precipitate was inhibited by the excess amount of co-existing anions, such as SO_4^<2->. When the removal of SO_4^<2-> from FGD water was carried out by use of a coagulation process, the removal efficiency of Se(VI) from the simulated FGD waters by the photoreduction process was improved.
2012-10-15