Characteristics of dioxin emissions at startup and shutdown of MSW incinerators
| Autor: | Akihiro Matsumoto, Nobuo Takeda, Masahide Nishigaki, Hajime Tejima, Yasuyuki Fujita, Masaki Takaoka |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Flue gas
Engineering Environmental Engineering Municipal solid waste Waste management business.industry Health Toxicology and Mutagenesis Shutdown Public Health Environmental and Occupational Health Environmental engineering Air pollution Boiler (power generation) Incineration General Medicine General Chemistry Dioxins medicine.disease_cause Pollution Air Pollution Pollution prevention medicine Environmental Chemistry business Air quality index |
| Zdroj: | Chemosphere. 66:1123-1130 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2006.06.015 |
| Popis: | Dioxin concentrations from municipal waste incinerators in Japan and elsewhere often show low concentrations that comply with legal limits (in this paper, the term "dioxin" designates WHO-TEQ: PCDD/Fs+dioxin-like PCB). However, such data is usually generated under normal steady state operational conditions, and there has been little investigation of releases occurring during startup and shutdown. It is important, therefore, to ascertain quantitatively emissions in an unsteady state (startup and shutdown) in order to correctly evaluate the relationship between emissions from a facility and the surrounding environment. The present study aimed to examine dioxin emissions of a continuously operated incinerator at startup and shutdown, and estimating the time period of greatest emission, and the processes causing dioxin generation. The startup process was divided into five stages and the shutdown into two; at each stage, dioxins in the flue gas were measured at the boiler outlet and the stack. From the concentration of dioxins and the flue gas volume at each stage, the amount of dioxins at startup and shutdown were calculated, and these were compared with that under steady state conditions. Dioxin concentration at the stack under steady state conditions was a very low level, while those at startup and shutdown were higher. In the case where dioxin concentration under a steady state is a low level like in this study, it is indicated that the total annual dioxin emission from a facility could be attributed to the startup periods. |
| Databáze: | OpenAIRE |
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