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Emissions of PCDD/Fs and PCBs during the Cold Start-up of Municipal Solid Waste Incinerators

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Volume: 14 | Issue: 6 | Pages: 1593-1604
DOI: 10.4209/aaqr.2014.06.0118
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Chun-Jou Guo1, Mao-Sung Wang2, Sheng-Lun Lin 2,3, Hsiao-Hsuan Mi 4, Lin-Chi Wang5, Guo-Ping Chang-Chien3,6

  • 1 Department of Environmental Engineering, National Cheng Kung University, Tainan City 70101, Taiwan
  • 2 Center for General Education, Cheng Shiu University, Kaohsiung City 83347, Taiwan
  • 3 Super Micro Mass Research and Technology Center, Cheng Shiu University, Kaohsiung City 83347, Taiwan
  • 4 Department of Environmental Engineering & Science, Chia-Nan University of Pharmacy & Science, Tainan City 71743, Taiwan
  • 5 Department of Civil Engineering and Engineering Informatics, Cheng Shiu University, Kaohsiung City 83347, Taiwan
  • 6 Department of Cosmetic and Fashion Styling, Cheng Shiu University, Kaohsiung City 83347, Taiwan

Highlights

The peak levels of PCDD/F and PCB occurred at 295–359°C during the cold start-up.
Both PCDD/F and PCB levels were remained high after 45 hours from the start-up.
The annual PCDD/F + PCB emission will sharply increase if the start-up was included.
Reducing the times of start-up is more important than the average PCDD/F levels.


Abstract

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°C); (2) the second stage (250–850°C), and the final stage (850–1000°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°C, within the temperature window (250–450°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.

Keywords

Polychlorinated dibenzo-p-dioxins Polychlorinated dibenzofurans Polychlorinated biphenyls Municipal solid waste incinerators Cold start-up


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