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A 13-test study was performed to determine whether the overlire air and nominal steam load of a waste-to-energy municipal incinerator could be adjusted to minimize formation of the chlorinated dibenzep-dioxins (CDDs) and dibenzofurans (CDFs). Stack emissions and precipitator fly-ash were analyzed for chlorobenzenes, chlorophenols, and polychlorinated biphenyls in addition to the CDDs/CDFs. The results showed that efficient collection of stacksmitted CDDs/CDFs was obtained, and that a single overnight soxhlet extraction with toluene was sufficient for complete recovery of all extractable CDDs/CDFs in fly-ash.No strong correlations were observed between the incinerator variables studied and the CDD/CDF emissions. Likewise, no strong correlations between the concentrations of CDDs/CDFs in stack emissions and concentrations of precursors were obtained, although some trends were observed. Results suggest that the CDD : CDF ratio and relative CDD/CDF congener distributions may be affected by incinerator conditions. Although a specific set of incinerator conditions to minimize CDD/CDF emissions were not developed, it was found that with efficient incinerator operation these emissions can be held below the Ontario provisional guideline.

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