EXPERIMENTAL STUDIES ON Hg VAPOUR REMOVAL USING CORONA DISCHARGE

概要

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Experimental studies have been undertaken on the chemical change of Hg vapour (H°g) by corona discharge to investigate the possibility of Hg removal technique, The species of gasses used were compound gas (C gas) and exhaust gas of a municipal refuse incinerator (E gas). C gas or (E+C) gas including about 0.5 mg-Hg/m3 was led to small-scale cylinder (inside diameter: 56.5mm, discharge electrode diameter: 0.26mm, length: 250mm), and there corona discharge (positive or negative corona) was generated, The gas exhausted from the cell was led to gas wash bottle (distilled water), and then H°g concentration was measured continuously. H°g removal efficiency increased as corona power was increased, and decreased as gas temperature was increased, The H°g removal mechanism is suggested as follows; In case of the gas including O2 and no HCe, H°g reacts with O3 or O generated by corona discharge to O form HgO. In case of the gas including even low concentration of HCe, H°g reacts with HCe to form HgCe2 markedly. Intermittent discharge resulted in effective H°g removal, H°g changed to watersoluble form after passing EP of a municipal refuse incinerator.
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