title: Thermal removal of PCDD/Fs from medical waste incineration fly ash--effect of temperature and nitrogen flow rate.
abstract: The fly ash used in this study was collected from a bag filter in a medical waste rotary kiln incineration system, using lime and activated carbon injection followed by their collection as mixed fly ash. Experiments were conducted on fly ash in a quartz tube, heated in a laboratory-scale horizontal tube furnace, in order to study the effect of temperature and nitrogen flow rate on the removal of PCDD/Fs. Results indicated that in this study PCDD/Fs in the fly ash mostly were removed and desorbed very little into the flue gas under thermal treatment especially when the heating temperature was higher than 350 °C, and dechlorination and destruction reactions took important part in the removal of PCDD/Fs. However, in terms of flow rate, when flow rate was higher than 4 cm s(-1), destruction efficiency of PCDD/Fs decreased dramatically and the main contributors were P(5)CDF, H(6)CDF and H(7)CDF desorbed to flue gas, the PCDD/Fs in the fly ash decreased with enhanced flow rate.
authors.affiliation: State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China.
authors.forename: Hai-long
authors.initials: HL
authors.lastname: Wu
authors.forename: Sheng-yong
authors.initials: SY
authors.lastname: Lu
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Yan
authors.forename: Xiao-dong
authors.initials: XD
authors.lastname: Li
authors.forename: Tong
authors.initials: T
authors.lastname: Chen
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D001572:Benzofurans / Q000032:analysis / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D017745:Incineration / Q000379:methods*; D008506:Medical Waste / Q000032:analysis; D017744:Medical Waste Disposal / Q000379:methods*; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D013696:Temperature
chemical_list: D000393:Air Pollutants; D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D008506:Medical Waste; D017744:Medical Waste Disposal; D000072317:Polychlorinated Dibenzodioxins; D009584:Nitrogen