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| Concentration and characterization of PCDD/Fs emission from secondary lead and aluminum metallurgy plants |
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Abstract The concentration and characterization in stack gas and fly ash from two secondary aluminum metallurgy plants and one secondary lead metallurgy plant were investigated. The results showed that the concentrations of PCDD/Fs in stack gas released from the two secondary aluminum metallurgy plants were 2.14 and 0.88 ng TEQ/Nm3, respectively, the corresponding concentrations in fly ash were 33.90 and 0.77 ng TEQ/g, respectively. The PCDD/Fs concentrations of stack gas and fly ash from the secondary lead metallurgy plant was 0.037 ng TEQ/Nm3 and 0.014 ng TEQ/g, respectively. Although the homologue distributions of PCDD/Fs in stack gas from the two secondary aluminum metallurgy plants were different, they were similar in fly ash. The congener distributions of PCDD/Fs were quite different between secondary aluminum and lead metallurgy plants. Due to the ratio of total PCDF/PCDD was above one, de novo synthesis may be the main formation mechanism of PCDD/Fs emission from secondary lead and aluminum metallurgies.
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Received: 01 November 2011
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