Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 7, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.172056
Keywords
hazardous waste incinerator; start-up; normal operation; PCDD/F; memory effect; PCDD/F I-TEQ indicator
Categories
Funding
- National Key Research and Development Program of China [2017YFE0107600]
- Innovative Research Groups of the National Natural Science Foundation of China [51621005]
- National Natural Science Foundation of China [51706201]
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Comprehensive diagnosis of polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) emissions was systematically conducted on three hazardous waste incinerators (HWIs). Results indicated that PCDD/F mainly existed in the solid phase before the bag filter. This was especially true for higher chlorinated dioxin and furan congeners (hexa-, hepta- and octa-). The aged bag filters tended to increase the gas-phase PCDD/F. Emissions also increased due to PCDD/F desorption from circulated scrubbing solution and plastic packing media used in the wet scrubber. The PCDD/F concentrations were elevated during the start-up process, reaching up to 5.4 times higher than those measured during the normal operating period. The ratios of PCDFs/PCDDs revealed that the surface-catalysed de novo synthesis was the dominant pathway of PCDD/F formation. Installation of more efficient fabric filters, intermittent replacement of circulated scrubbing solution will result in reduced PCDD/F emission. Additionally . , 2,3,4,7,8-PeCDF correlated well with the international toxic equivalent quantity (I-TEQ) value, which suggests that 2,3,4,7,8-PeCDF could act as an I-TEQ indicator.
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