Correlation of PCDD/PCDF and CO values in a MSW incinerator--indication of memory effects in the high temperature/cooling section.
The correlation of PCDD/PCDF levels with the CO emissions in a full-scale municipal waste incinerator was assessed during a four-week measurement effort. PCDD/PCDF concentrations in fly ashes-containing more than 99% of the total PCDD/PCDF burden of the fluidized bed incinerator (FBI)-were measured and compared with the emitted CO concentrations. The CO concentration during the sampling time showed no significant correlation to the PCDD/ PCDF amount in fly ash (R2 = 0.078). However, a comparison of the time integrated CO concentration several hours before sampling lead to a correlation with the PCDD/PCDF burden. Maximum correlation was found for the time integrated CO values of 3 and 4 h before sampling (R2 = 0.467 and R2 = 0.457 respectively). This indicates a memory effect in the high temperature cooling section of several hours. Possible mechanisms leading to the memory effect are discussed. The correlation of PCDD/PCDF with CO concentration demonstrate that the combustion conditions play an important role for PCDD/PCDF formation in FBIs. However the variability in the correlation of CO to PCDD/PCDF levels show that other factors have a significant influence on PCDD/PCDF formation.
Weber
Roland
R
Department of Environmental Process Development, Ishikawajima-Harima Heavy Industries Co., Ltd., Yokohama, Japan. roland_weber@ihi.co.jp
Sakurai
Takeshi
T
Ueno
Shunichiro
S
Nishino
Junya
J
D000327:Adsorption; D001572:Benzofurans / Q000032:analysis* / Q000737:chemistry; D002248:Carbon Monoxide / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D017745:Incineration; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis* / Q000737:chemistry; D012037:Refuse Disposal; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants; D002248:Carbon Monoxide