Dechlorination of polychlorinated biphenyls, dibenzo-p-dioxins and dibenzofurans on fly ash.
Dechlorination of commercial mixtures of polychlorinated biphenyls (PCB) as well as polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) on extracted and non-extracted fly ash obtained from municipal waste incinerator (MWI) was studied in closed systems under nitrogen atmosphere at temperatures of 260 degrees C and 340 degrees C. Decomposition results (given as the difference between PCB or PCDD/F molar amounts before and after the experiment (in %) due predominantly to dechlorination reactions) and detoxification data (expressed similarly but related to toxic PCB and PCDD/F congeners only and given in I-TEQ units) are reported. Detoxification of Delor 105/80T at 260 degrees C and 340 degrees C at a loading of 0.65 wt%, was 99.48% and 100%, respectively. The decomposition of Delor 103 at 340 degrees C and for the loading of 0.75 wt%, corresponded to 99.99%. The detoxification capability of PCDD/Fs on extracted and non-extracted fly ash for loading of 130 and 264 ng/0.4 g of fly ash at 340 degrees C made 96 and 98%, respectively.
Stach
J
J
Institute of Chemical Process Fundamentals, Praha, Czech Republic.
Pekárek
V
V
Grabic
R
R
Lojkásek
M
M
Pacáková
V
V
D001572:Benzofurans / Q000032:analysis / Q000737:chemistry*; D002244:Carbon; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002713:Chlorine / Q000737:chemistry* / Q000302:isolation & purification; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D008401:Gas Chromatography-Mass Spectrometry; D006358:Hot Temperature; D007220:Industrial Waste; D009584:Nitrogen; D052638:Particulate Matter; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry*
D001572:Benzofurans; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D007220:Industrial Waste; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D002713:Chlorine; D002244:Carbon; D011078:Polychlorinated Biphenyls; D009584:Nitrogen