Characteristics of PCDD/F content in fly ash discharged from municipal solid waste incinerators
Journal
Journal of Hazardous Materials
Journal Volume
192
Journal Issue
2
Pages
521
Date Issued
2011-08-30
Author(s)
Abstract
Different from most previous studies with quantity-limited data, this paper presents PCDD/F content characterization in the fly ash discharged from sixteen large-scale commercial MSWIs. From the results with over hundreds of data using periodically sampling and analysis, it was found that the PCDD/F contents in the fly ash were from 9.07 to 46.68. ng/g, d.w., and if based on international toxicity equivalent quantity, they were from 0.78 to 2.86. ng. I-TEQ/g, d.w. The higher chlorinated PCDDs likely dominated more than lower chlorinated PCDDs, but this tendency was not for PCDFs. The OCDD had the highest contribution to the total PCDD/F content, but if based on I-TEQ content, 2,3,4,7,8-PeCDF is the PCDD/F congener with the highest toxicity contribution. Moreover, the PCDD/F characteristic index (DCI) is suggested using the representative congener content of 2,3,4,7,8-PeCDF to characterize the fly ash. The DCI is 0.875 ± 7.6% for the fly ash discharged from the MSWI with the APCD assembly of SD, AC and BF. The findings obtained in this work provide overview information on the PCDD/F content characterization in fly ash. They will provide PCDD/F fingerprint information to distinguish from other PCDD/F sources, like steel refinery industry, hazardous waste incinerators, or cement kilns, and thus be applied to fly ash management in the environment. © 2011 Elsevier B.V.
Subjects
Fly ash | MSW incinerators | PCDD | PCDF
Publisher
ELSEVIER SCIENCE BV
Type
journal article