Abstract
The effect of cofiring coal with municipal waste on formation of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was examined by cofiring minor amounts (<7% by wt) of high (3.4% by wt) or low (0.7% by wt) sulfur (S) coal in a municipal waste combustor. PCDD/F concentrations were reduced up to 80% during the 13-run, 6-day effort. Both current and past operating conditions (fuel type and rate, gas concentrations) had an effect on current levels of PCDD/F formation. The influence of past conditions is consistent with a PCDD/F formation mechanism involving combustor wall deposits as sites for formation and indicates that PCDD/F measurements on field units may be affected in part by past operating conditions, at least up to 6 h. These wall deposits act as sources and receptors of PCDD/F precursors, reactants, and/or catalysts. It is proposed that an effect of higher sulfur dioxide concentration from cofiring coal is to displace the sulfate/chloride equilibrium in the deposit...
Published Version
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