Thermal degradation of PCDD/F, PCB and HCB in municipal solid waste ash.
A thermal degradation procedure for reducing the concentrations of mono- to octa-chlorinated PCDD/Fs, PCBs and hexa-chlorobenzenes (HCB) in filter ash from incinerated municipal solid waste (MSW) is described. Thermal treatment of filter ash samples at 500 degrees C for 60 min in a closed system providing low oxygen conditions resulted in 97% and 99% reductions in the total and I-TEQ concentrations of PCDD/Fs, to 6.8 microg kg(-1) ash and <0.05 microg I-TEQ kg(-1) ash, respectively. Increasing the thermal treatment time to 480 min, at the same temperature, yielded 99% reductions in both total and I-TEQ concentrations of the mono- to octa-chlorinated PCDD/Fs. Similar effects were observed for HCB and PCBs. The data from this study indicate that PCDD/Fs and other toxic organic compounds in ash from incinerated MSW, can be effectively degraded by this procedure, which combines relatively low-temperatures, short treatment times, and low oxygen conditions.
Lundin
Lisa
L
Department of Chemistry, Environmental Chemistry, Umeå University, SE-901 87 Umeå, Sweden. lisa.lundin@chem.umu.se
Marklund
Stellan
S
D001572:Benzofurans / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D006581:Hexachlorobenzene / Q000737:chemistry*; D006358:Hot Temperature; D017745:Incineration / Q000379:methods*; D052638:Particulate Matter / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry
D001572:Benzofurans; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D006581:Hexachlorobenzene; D002244:Carbon; D011078:Polychlorinated Biphenyls