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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/28560


    標題: Emissions of PCDD/Fs and PCBs during the Cold Start-up of Municipal Solid Waste Incinerators
    作者: Guo, Chun-Jou
    Wang, Mao-Sung
    Lin, Sheng-Lun
    Mi, Hsiao-Hsuan
    Wang, Lin-Chi
    Chang-Chien, Guo-Ping
    貢獻者: 環境工程與科學系
    關鍵字: Polychlorinated dibenzo-p-dioxins
    Polychlorinated dibenzofurans
    Polychlorinated biphenyls
    Municipal solid waste incinerators
    Cold start-up
    日期: 2014-10
    上傳時間: 2015-05-06 21:20:42 (UTC+8)
    出版者: Taiwan Assoc Aerosol Res-Taar
    摘要: This study investigated the emissions of polychlorinated dibenzo-p-dioxins, dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) from 45-hr cold start-up operations (from the ambient temperature) of two municipal solid waste incinerators (MSWIs). Fifteen samples were collected during the whole process, while the sampling period was divided as follows: (1) the initial stage (25-250 degrees C); (2) the second stage (250-850 degrees C), and the final stage (850-1000 degrees C). The peak of total (PCDD/F + PCB) (WHO2005-TEQ) concentration occurred during the second stage of the cold start-up. This could because the temperature in the combustion chamber reached 295-359 degrees C, within the temperature window (250-450 degrees C) of PCDD/F reformation by de novo synthesis. However, both PCDD/F and PCB (WHO2005-TEQ) concentrations were still 2.8-3.8 times higher than the regulated standards in Taiwan 45 hours after the cold start-up began, demonstrating significant memory effects. Higher PCB/(PCDD/F + PCB) TEQ fractions were observed during the initial stage of cold start-up. This is probably due to the higher volatilities of memorized PCB-126 and -169 than PCDD/F congeners, thus making them more easily released into the flue gas. On the other hand, the total (PCDD/F + PCB) emissions during 45-hr cold start-up were estimated at 46-68 mg WHO2005-TEQ. The annual (PCDD/F + PCB) emissions from normal conditions are generally estimated by the normal operating emissions factor without the cold start-up. The normal annual (PCDD/F + PCB) emission rates of the two MSWIs were 70.7-101 mg WHO2005-TEQ, including once cold start-up emission, and these increased to 142-480 mg WHO2005-TEQ, up by 65-458%, if one to eight times of cold start-up were included. Therefore, reducing unnecessary start-ups could be more important with regard to controlling the PCDD/F and PCB emissions than only attempting to increase the pollutant removal efficiency in the steady operations of MSWIs.
    關聯: Aerosol and Air Quality Research, v.14 n.6, pp.1593-U358
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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