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International Journal of Energy for a Clean Environment

年間 8 号発行

ISSN 印刷: 2150-3621

ISSN オンライン: 2150-363X

SJR: 0.597 SNIP: 1.456 CiteScore™:: 3.7 H-Index: 18

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COMPARISON OF THREE OXIDIZING AGENTS FOR EFFICIENCY OF MERCURY REMOVAL IN A PACKED-BED WET SCRUBBER FROM INFECTIOUS WASTE INCINERATOR

巻 7, 発行 2, 2006, pp. 175-186
DOI: 10.1615/InterJEnerCleanEnv.v7.i2.60
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要約

One of the most importance problems of infectious waste incinerators is the control of heavy metals, especially mercury. The packed-bed wet scrubber is recommended for improving removal efficiency. A quantity of 5 kg of simulated waste including plastics, cottons, rubber gloves, and 1000 ppb pure mercury was used for feed waste per batch. Mercury was fed to the incinerator every 6−10 min at optimum operating temperature and combustion air during the incineration. Mass balance, mercury feed rate, and mercury concentration from the emission stack were used to determine the mercury removal efficiency. Three oxidizing agents, potassium permanganate, hydrochloric acid, and chlorine solution, were selected as a mercury capture substance. As results, by adding 15, 50, and 75 ppm of potassium permanganate, the mercury removal efficiencies were 79, 90, and 99%, respectively. For hydrochloric acid, at pH 3.0, 4.0, and 5.0, the results showed that the removal efficiency was the same rate, at approximately 70%. Another oxidizing agent, chlorine, was added to the recirculation tank by various concentrations, 50, 75, and 100 ppm. The mercury removal efficiencies by the chlorine solution for those three concentrations were 75, 80, and 87%, respectively. By comparison, the plausible agent for mercury removal in a packed-bed wet scrubber is a potassium permanganate at concentration of 75 ppm. However, this agent is not significant for other air pollutants (CO, NOx, and SO2) in terms of removal efficiency or capability, as well as those of hydrochloric acid and chlorine solution.

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