title: [Thermal treatment behavior of PCDD/Fs on the fly ash from medical waste incineration].
abstract: PCDD/Fs formation distribution in gas phase and solid phase of medical waste incineration fly ash under both the flowing nitrogen and static air condition were studied within temperature range of 200-450 degrees C. Under the flowing nitrogen, PCDD/Fs in solid phase increased with temperature increase, which reached the maximum concentration at 350 degrees C, both the TEQ and total concentration increased 46.0% and 26.0% respectively of original concentration, then, which decreased with temperature's rising, reaching the lowest level at 450 degrees C, of which 86.8% and 80.5% respectively in turn removed. Under the static air, the maximum concentration in solid phase occurred at 250 degrees C, both the TEQ and total concentration increased 20.7% and 28.7% respectively of original concentration, then, which decreased with temperature increase, reaching the lowest level at 450 degrees C, of which 99.5% and 99.5% respectively in turn removed. There were small generation of PCDD/Fs in gas phase, which took only 0.11%-2.16% of the total quantity of PCDD/Fs in both gas phase and solid phase. The optimal conditions for thermal treatment in this study were under the static air at temperature of 450 degrees C in duration of 1 h. The mechanism of destruction played the main role in the thermal treatment, while dechlorination and desorption acted as minor role in this study.
authors.affiliation: Foreign Economic Cooperation Office, Ministry of Environmental Protection, Beijing 100035, China. peng.zheng@mepfeco.org.cn
authors.forename: Zheng
authors.initials: Z
authors.lastname: Peng
authors.forename: Qiong
authors.initials: Q
authors.lastname: Ding
authors.forename: Chen
authors.initials: C
authors.lastname: Jiang
authors.forename: Xin-hua
authors.initials: XH
authors.lastname: Gao
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Yan
mesh_terms: D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D004787:Environmental Pollution / Q000517:prevention & control; D006358:Hot Temperature; D017745:Incineration; D017744:Medical Waste Disposal / Q000379:methods*; D052638:Particulate Matter / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification
chemical_list: D060729:Coal Ash; D017744:Medical Waste Disposal; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants; D002244:Carbon