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Pandelova, M. ; Stanev, I.* ; Henkelmann, B. ; Lenoir, D. ; Schramm, K.-W.

Correlation of PCDD/F and PCB at combustion experiments using wood and hospital waste. Influence of (NH₄)₂SO₄ as additive on PCDD/F and PCB emissions.

Chemosphere 75, 685-691 (2009)

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The objectives of this work were to study the emissions of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/F) and polychlorinated biphenyl (PCB) during the combustion of wood, wood and hospital waste as well as wood, hospital waste and (NH(4))(2)SO(4) in a pilot plant and to determine the relation of the toxic emissions to the fuel properties. The presence of PVC (experiments b and c) increases PCDD/F and PCB formation compared to burning only eco-farm wood (a). However, analysis and quantification of PCDD/F and PCB showed that the amount of 5% of (NH(4))(2)SO(4) in the fuel mixture significantly impacted the dioxins emissions and suppressed it by approximately 50%. In addition, longer duration of the combustion experiment by using (NH(4))SO(4) resulted in a stronger inhibition of the toxic emissions. Overall, the lowest values were observed during the combustion of the fuel blends containing wood only. Relationships of PCDD/F (WHO-TEQ) and individual congeners of WHO-PCDD/F, WHO-PCB and six PCB indicator congeners were also found. As a result, all single PCB congeners were identified as PCDD/F (WHO-TEQ) surrogates in the flue gas. Furthermore, the correlation between PCDD/F and PCB congeners was examined by statistical methods such as cluster analysis (CA). Closely neighboured pairs on the dendrogram were additionally confirmed by a high linear coefficient of determination (R(2)). (NH(4))(2)SO(4)-containing samples did not affect the correlations between PCDD/F and PCB at the concentrations given.

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