Study on the Removal of Dioxins in Exhaust Gas of Incinerator by Artificial Zeolite.
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概要
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In this study, the effects of space velocity (SV) and gas temperature on the removal rate of Dioxins (polychlorinated dibenzo-<I>p</I>-dioxins, polychlorinated dibenzofurans=PCDD/DF) in exhaust gas of incinerator by fly ash-derived artificial zeolite were investigated. The highest removal rate calculated by TEQ value (98.7%) of vapor PCDD/DF in exhaust gas of small size incinerator was found at 150°C and 10000h<SUP>-1</SUP> as SV value. Removal rate decreased with the increase of gas temperature and/or with the increase of SV value, and also relatively low removal rate of vapor PCDD/DF was found in low chlorinated PCDD/DF-congeners and -isomers. These results suggested that the adsorption mechanism of PCDD/DF by artificial zeolite was mainly due to physical adsorption. However, rapid increase of vapor PCDD/DF concentration was found at 300°C. It was considered due to new synthesis of PCDD/DF, so called <I>de-novo</I> synthesis. Furthermore, considering these observations, the removal method of PCDD/DF by artificial zeolite will be effective in small size incinerator.
- 日本環境化学会の論文
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