A novel method to enhance polychlorinated dibenzo-p-dioxins and dibenzofurans removal by adding bio-solution in EAF dust treatment plant.
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.
Li
Hsing-Wang
HW
Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
Lee
Wen-Jhy
WJ
Tsai
Perng-Jy
PJ
Mou
Jin-Luh
JL
Chang-Chien
Guo-Ping
GP
Yang
Kuen-Thyr
KT
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
D001572:Benzofurans; D060729:Coal Ash; D004391:Dust; D007220:Industrial Waste; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D002244:Carbon; C023614:dibenzofuran