The report summarizes the results of a dioxin/furan emissions test of a black liquor recovery boiler equipped with a drybottom electrostatic precipitator for particulate emissions control. Black liquor recovery boilers are used at kraft pulp mills to produce process steam and to reclaim inorganic chemicals from spent wood pulping liquors. The dioxin/furan emissions test was conducted under Tier 4 of the National Dioxin Study. The primary objective of Tier 4 is to determine if various combustion sources are sources of dioxin and/or furan emissions. If any of the combustion sources are found to emit dioxin or furan, the secondary objective of Tier 4 is to quantify these emissions. Black liquor recovery boilers are one of 8 combustion source categories that have been tested in the Tier 4 program. The tested black liquor boiler, hereafter referred to as boiler BLB-C, was selected for the test after an initial information screening and a one-day pretest survey visit. Boiler BLB-C is considered representative of black liquor recovery boilers with dry bottom electrostatic precipitators. The amount of chloride present in the black liquor circuit at this site is considered intermediate to high relative to that found at other kraft pulp mills. Data presented in the report include dioxin (tetra through octa homologue +2378 TCDD) and furan (tetra through octa homologue +2378 TCDF) results for both stack samples and ash samples. In addition, process data collected during sampling are also presented.

"Donald Oberacker, Project Officer." "April 1987." "EPA-450/4-84-014q." Final. Contract Number: 68-03-3148 Microfiche.