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Thermal reaction characteristics of dioxins on cement kiln dust
Cement kiln dust is commonly recycled back into the production process. This results in elevated concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the flue gases of cement plants. The present study investigated the effects the reaction temperature, oxygen content, an...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9077670/ https://www.ncbi.nlm.nih.gov/pubmed/35542941 http://dx.doi.org/10.1039/c7ra09220b |
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author | Zhan, Ming-Xiu Pan, Shuping Deviatkin, Ivan Chen, Tong Li, Xiao-Dong |
author_facet | Zhan, Ming-Xiu Pan, Shuping Deviatkin, Ivan Chen, Tong Li, Xiao-Dong |
author_sort | Zhan, Ming-Xiu |
collection | PubMed |
description | Cement kiln dust is commonly recycled back into the production process. This results in elevated concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the flue gases of cement plants. The present study investigated the effects the reaction temperature, oxygen content, and origin of kiln dust had on the thermal reaction characteristics of PCDD/Fs. The concentration of 2,3,7,8-PCDD/Fs that were desorbed from the kiln dust decreased as the reaction temperature was increased and the higher temperature facilitated the degradation of PCDD/Fs. However, the oxygen content, which ranged from 6–21%, had only a minor impact on the thermal reaction characteristics of PCDD/Fs. Finally, the thermal reaction characteristics of PCDD/Fs were largely affected by the origin of the kiln dust; 1.2 pg I-TEQ g(−1) was desorbed from kiln dust originating from a cement plant that co-processed refuse-derived fuel (RDF) and 47.5 pg I-TEQ g(−1) was desorbed from kiln dust originating from a cement plant that co-processed hazardous waste. The study also found that PCDD/F formation pathways were dependent on the origin of the kiln dust; precursor synthesis dominated PCDD/F formation on the kiln dust collected from a cement plant that co-processed RDF, while de novo synthesis dominated the formation of PCDD/Fs on the remaining samples of kiln dust. |
format | Online Article Text |
id | pubmed-9077670 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90776702022-05-09 Thermal reaction characteristics of dioxins on cement kiln dust Zhan, Ming-Xiu Pan, Shuping Deviatkin, Ivan Chen, Tong Li, Xiao-Dong RSC Adv Chemistry Cement kiln dust is commonly recycled back into the production process. This results in elevated concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the flue gases of cement plants. The present study investigated the effects the reaction temperature, oxygen content, and origin of kiln dust had on the thermal reaction characteristics of PCDD/Fs. The concentration of 2,3,7,8-PCDD/Fs that were desorbed from the kiln dust decreased as the reaction temperature was increased and the higher temperature facilitated the degradation of PCDD/Fs. However, the oxygen content, which ranged from 6–21%, had only a minor impact on the thermal reaction characteristics of PCDD/Fs. Finally, the thermal reaction characteristics of PCDD/Fs were largely affected by the origin of the kiln dust; 1.2 pg I-TEQ g(−1) was desorbed from kiln dust originating from a cement plant that co-processed refuse-derived fuel (RDF) and 47.5 pg I-TEQ g(−1) was desorbed from kiln dust originating from a cement plant that co-processed hazardous waste. The study also found that PCDD/F formation pathways were dependent on the origin of the kiln dust; precursor synthesis dominated PCDD/F formation on the kiln dust collected from a cement plant that co-processed RDF, while de novo synthesis dominated the formation of PCDD/Fs on the remaining samples of kiln dust. The Royal Society of Chemistry 2018-01-17 /pmc/articles/PMC9077670/ /pubmed/35542941 http://dx.doi.org/10.1039/c7ra09220b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Zhan, Ming-Xiu Pan, Shuping Deviatkin, Ivan Chen, Tong Li, Xiao-Dong Thermal reaction characteristics of dioxins on cement kiln dust |
title | Thermal reaction characteristics of dioxins on cement kiln dust |
title_full | Thermal reaction characteristics of dioxins on cement kiln dust |
title_fullStr | Thermal reaction characteristics of dioxins on cement kiln dust |
title_full_unstemmed | Thermal reaction characteristics of dioxins on cement kiln dust |
title_short | Thermal reaction characteristics of dioxins on cement kiln dust |
title_sort | thermal reaction characteristics of dioxins on cement kiln dust |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9077670/ https://www.ncbi.nlm.nih.gov/pubmed/35542941 http://dx.doi.org/10.1039/c7ra09220b |
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