Emission Characteristics of PCDDs/PCDFs from Nonferrous Metal Foundy
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Abstract
Three lead-smelting furnaces, one of which was primary and two of which were secondary, and two zincmelting furnaces, one was primary and the other was secondary, were selected from five plants in nonferrous metal foundries. PCDDs/PCDFs samplings were achieved two times at the stacks of each furnace to investigate emission characteristics of PCDDs/PCDFs from both primary and secondary smelting processes of lead and zinc. From a total of ten measurements, PCDDs/PCDFs emission levels averaged 0.074 ng-TEQ/Sm3 and 0.022 ng-TEQ/Sm3 in lead- and zinc-smelting processes, respectively. Secondary smelting furnaces emitted about three to five times higher levels of PCDDs/PCDFs than primary smelting furnace. PCDFs showed approximately 1.5 to 3 times higher concentrations than PCDDs, revealing that the ratios of PCDDs to PCDFs averaged 40:60 and 23:77 in lead- and zinc-smelting processes, respectively. The main contributor to total TEQs was 2,3,4,7,8-PeCDF, and its TEQ values were in the range of 32% to 37% of total TEQs.
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