JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
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magnitude higher or lower than either stack test or air permit data, depending on the type of feed, composition and moisture content, and type of boiler.
air pollutants. Information on emission control equip- ment for each mill was not available; thus, all the reported emission factors may not be considered uncontrolled. The very wide range of emission factors is due to the fact that the emission factors reported by CORRIM have a different fuel composition compared to stack test and air permit data source. EPA’s CEDRI database EPA developed the Compliance and Emissions Data Reporting Interface (CEDRI) and Web Factor Information Retrieval System (WebFIRE) because federal regulations require facilities to electronically submit emis- sion test data in the form of performance test reports to EPA. WebFIRE is EPA’s online emissions data repository, retrieval, and development tool (https://www.epa.gov/ electronic-reporting-air-emissions/webfire). The WebFIRE database does not provide the necessary infor- mation to estimate emission factors and is limited in the pollutants measured. Refer to the SI for details on emis- sion factors reported from the database.
Survey by Consortium for Research on Renewable Industrial Materials (CORRIM) CORRIM did a survey to collect data on emission factors from 12 wood production facilities in the Pacific Northwest and Southeast United States, with an equal number of facilities surveyed in each region (Puettmann and Milota 2017). The data was collected for the boilers operating in the 2012 calendar year, with a mass weighted average fuel composition of 65.9% hog fuel, 13.5% sawdust, 10.7% shav- ings, and 9.4% wood and bark. The boiler ages were between 4 and 32 years, with most boilers at the lower end of the age limit and thus likely representing recent technology. The data were reported in pollutant mass emitted per unit fuel consumed (kilogram pollutant / kilogram wood ), which we converted to lb/MMBtu using the high heating value of wood. Figure 4 shows the average emission factors for criteria and select toxic
Figure 4. Emission factors for PM 10 , PM 2.5 , selected HAPs, and gaseous pollutants that are calculated from data reported by CORRIM. Y-axis units are lb/MMBtu. The data sources refer to 12 individual wood mills (wood production facilities) surveyed by CORRIM in the Pacific Northwest and Southeast United States. (Note that details about individual mills are not available since these were considered business confidential information.)
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