title: A novel method to enhance polychlorinated dibenzo-p-dioxins and dibenzofurans removal by adding bio-solution in EAF dust treatment plant.
abstract: In order to understand the effect of different amounts of powder-activated carbon (PAC) injection and bio-solution (NOE-7F) addition on the removal efficiencies of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in a fly ash treatment plant with Waelz rotary kiln process, the PCDD/F concentrations in the stack flue gasses were measured and discussed. In the amount of 20, 40 and 50 kg/h PAC injection, the removal efficiencies of PCDD/Fs in the stack flue gas were 86, 96 and 97%, respectively. While adding more amounts of PAC did enhance the removal efficiencies, the reduction fractions of low chlorinated PCDD/F congeners were much higher than those of highly chlorinated PCDD/F congeners. Particularly, a lower amount of PAC injection (20 kg/h), not only cannot remove highly chlorinated PCDD/Fs, but also the carbon surface of the PAC can act as a precursor for the formation promotion of highly chlorinated PCDD/F congeners. The addition of NOE-7F in the raw materials had the dechlorination effect on the PCDD/F removal and mainly inhibited highly chlorinated PCDD/F formation. The combination of both PAC injection and NOE-7F addition has a high potential for practical application.
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: Hsing-Wang
authors.initials: HW
authors.lastname: Li
authors.forename: Wen-Jhy
authors.initials: WJ
authors.lastname: Lee
authors.forename: Perng-Jy
authors.initials: PJ
authors.lastname: Tsai
authors.forename: Jin-Luh
authors.initials: JL
authors.lastname: Mou
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Chang-Chien
authors.forename: Kuen-Thyr
authors.initials: KT
authors.lastname: Yang
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001572:Benzofurans / Q000032:analysis / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002244:Carbon / Q000737:chemistry; D002849:Chromatography, Gas; D060729:Coal Ash; D004391:Dust; D017745:Incineration / Q000295:instrumentation / Q000379:methods*; D007220:Industrial Waste / Q000032:analysis; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000378:metabolism; D015003:Yeasts / Q000378:metabolism
chemical_list: D001572:Benzofurans; D060729:Coal Ash; D004391:Dust; D007220:Industrial Waste; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D002244:Carbon; C023614:dibenzofuran