Document Detail


Influence of temperature on PCDD/PCDF desorption from waste incineration flyash under nitrogen.
MedLine Citation:
PMID:  16844194     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A municipal solid waste incinerator flyash was heated to between 200 and 400 degrees C under nitrogen in a bench-scale, static bed reactor for 4 days soak time. The influence of temperature on the levels of PCDD and PCDF remaining in and desorbed from the ash were investigated using GC-MS/MS. PCDD and especially PCDF formation was seen on the flyash between 225 and 300 degrees C. Large increases in the I-TEQ of the treated ash relative to the increase in its overall PCDD/PCDF content indicated that the formation of 2378-substituted congeners was favoured over that of other substitution patterns. In the absence of a source of gaseous oxygen, formation was mainly attributed to de novo reactions involving solid phase oxygen. Dechlorination of the PCDD/PCDF in flyash became increasingly important above 275 degrees C. Maximum desorption was seen at 325 degrees C, with the equivalent of 35 wt% of the PCDD/F in the original flyash being recovered from the exhaust traps at this temperature. The desorbed species were mainly M(1)CDD/CDDF-T(3)CDD/CDDF resulting from dechlorination of higher chlorinated PCDD/PCDF, with consequently low I-TEQ values.
Authors:
Adrian M Cunliffe; Paul T Williams
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-07-17
Journal Detail:
Title:  Chemosphere     Volume:  66     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-11-28     Completed Date:  2007-05-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1146-52     Citation Subset:  IM    
Affiliation:
Energy and Resources Research Institute, University of Leeds, Leeds LS2 9JT, UK.
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MeSH Terms
Descriptor/Qualifier:
Benzofurans / analysis*
Incineration / standards*
Nitrogen*
Temperature*
Tetrachlorodibenzodioxin / analogs & derivatives*,  analysis
Chemical
Reg. No./Substance:
0/Benzofurans; 0/chlorinated dibenzofurans; 0/polychlorodibenzo-4-dioxin; 1746-01-6/Tetrachlorodibenzodioxin; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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