Relevance of coplanar PCBs for TEQ emission of fluidized bed incineration and impact of emission control devices.
Five fluidized bed incinerators combusting municipal solid waste were assessed for the impact of coplanar PCBs on total TEQ emission. In 17 stack measurements, the coplanar PCBs contributed on average less than 3% to total TEQ with a maximum contribution of 7.5% to total TEQ in one measurement. Differences in the design of the flue gas cooling section did not show an effect on the impact of coplanar PCBs on total TEQ. The effect of emission control devices on the impact of coplanar PCBs on the total TEQ was studied in more detail at one incinerator. The relative contribution of PCBs to total TEQ increased along the flue gas line. This was caused by a slightly higher removal efficiency for TEQ relevant PCDDs/PCDFs compared to coplanar PCBs by the bag filters and a higher destruction efficiency for PCDDs/PCDFs compared to PCBs by the SCR catalyst. Additionally, the removal efficiencies of the emission control devices (bag filters and catalyst) for other chlorinated aromatic compounds which have been proposed as TEQ indicator compounds (polychlorinated benzenes and polychlorinated phenols) were compared with those for PCDDs/PCDFs and coplanar PCBs. Removal efficiencies for polychlorinated benzenes or polychlorinated phenols considerably differed from those of PCDD/PCDF and coplanar PCBs. Implications for TEQ assessments using indicator compounds as proposed in the literature are discussed.
Sakurai
Takeshi
T
Environmental Process Development Department, Ishikawajima-Harima Heavy Industries Co Ltd, 1, Shin-Nakahara-cho, Isogo-ku, Yokohama 235-8501, Japan.
Weber
Roland
R
Ueno
Shunichiro
S
Nishino
Junya
J
Tanaka
Masaru
M
D000397:Air Pollution / Q000517:prevention & control*; D001572:Benzofurans / Q000032:analysis; D002384:Catalysis; D000072338:Dibenzofurans, Polychlorinated; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D017745:Incineration; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D011482:Protective Devices; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D000072317:Polychlorinated Dibenzodioxins; D011078:Polychlorinated Biphenyls