Characteristics of PCDD/Fs in a Particles Filtration Device with Activated Carbon Injection

Abstract

Although numerous investigations have monitored polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran (PCDD/F) emissions from large municipal solid waste incinerators (MSWIs) and undertaken laboratory experiments to identify the formation mechanisms of PCDD/F, the PCDD/F profiles inside an air-pollution control device have seldom been determined. This study presents the outcome of a dioxin abatement program that injected particulate activated carbon (PAC) into an MSWI. The fly ashes collected from different locations in a bag filter were examined and the mass distribution was determined. Emissions from the stack were sampled to analyze PCDD/F content after injections of 10, 13 and 17 kg/h PAC. The concentration of PCDD congeners decreased from 117.00 to 0.32 ng/Nm 3 and that of PCDF decreased from 94.84 to 0.19 ng/Nm 3 . The concentrations of filter cake ashes in different chambers and at different locations varied at 105.11-147.53 ng/g. Based on mass balance evaluation, the flow rate of PCDD/Fs in filter cake ash was 3.33 ± 0.50 ng/min; this value was roughly six times higher than that of fly ash in the disposal pit, indicating that filter cake ash treatment warrants considerable attention due to the policy for controlling PCDD/Fs.

Monitoring and Identification of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Ambient Central Taiwan

“…Data points of ambient air sites cluster first with those of MWI, and then with open burning (OB) and crematories (CM). Previous studies have shown that PCDD/F emissions from crematories, medical waste incinerators and joss paper (semi-open systems) did significantly affect the surrounding environment Wang et al, 2003c;Hu et al, 2009;Wang et al, 2009b). The above results indicate that the ambient air samples were influenced significantly by stationary emission sources (MWI, ALS, EAF and CM) and open burning (OB).…”

Dry and Wet Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans on the Drinking Water Treatment Plant

“…The predominant congeners are OCDD, followed by 1,2,3,4,6,7,1,2,3,4,6,7,, and OCDF. The congener profile of ambient air was different from stack flue gas from a municipal solid waste incinerator or from unburned joss paper, such as OCDD, HpCDF, HpCDD, HxCDF and HxCDD (Hu et al, 2009;Wang et al, 2009).…”

Fate of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans during the Thermal Treatment of Electric Arc Furnace Fly Ash

“…Considerable research has examined the reaction mechanisms of PCDD/Fs in the Waelz process, and the results indicate that PCDD/Fs are mainly formed by the de novo synthesis from carbon sources and inorganic chloride (Huang and Buekens, 1996;Buekens et al, 2001;Wang et al, 2009b;Lin et al, 2010b;Chen et al, 2011). However, the formation and transformation reactions of PCDD/Fs in the vitrification process, which do not need any auxiliary fuel, are still not well understood.…”