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Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere
Bei, Jianye; Xu, Xu; Zhan, Mingxiu; Li, Xiaodong; Jiao, Wentao; Khachatryan, Lavrent; Wu, Angjian
2022-09-20
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Issue0Pages:1-11
AbstractGasification is an effective technology for the thermal disposal of municipal solid waste (MSW) with lower dioxin emission compared to the prevailing incineration process. Nevertheless, the mechanism of dioxin formation in the reducing atmosphere during the gasification process was seldomly explored. Herein, the effects of the atmosphere, temperature, and chlorine source were systematically investigated in terms of dioxin distribution. With CO2 and H2O as gasification agents, a reducing reaction atmosphere was formed with abundant H2 which effectively suppressed the generation of C-Cl, contributing to a substantial decrease of dioxin concentration by similar to 80% compared to the incineration process. The formation of dioxin was favored at temperatures below 700 degrees C with its peak concentration achieved at 500 degrees C. It was unveiled that inorganic chlorine played a dominant role in the reducing atmosphere, with a lower proportion of C-O-C/O-C �O on residual slag compared to an oxidizing atmosphere. Additionally, the generated H2 reduced the concentration of dioxins by attacking C-Cl and inhibiting the crucial Deacon reaction for dioxin formation, validated by density functional theory calculation. Eventually, the formation route paradigm and the reaction mechanism of dioxin formation from MSW gasification were revealed, facilitating and rationally guiding the control of dioxin emission.
Department环境化学与生态毒理学国家重点实验室 ; 环境化学与生态毒理学国家重点实验室
KeywordDIBENZO-P-DIOXINS GAS-PHASE FORMATION DE-NOVO SYNTHESIS FLY-ASH KINETIC-MODEL TO-ENERGY CHLORINE COMBUSTION PYROLYSIS PCDD/FS
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47612
Collection环境化学与生态毒理学国家重点实验室
Corresponding AuthorZhan, Mingxiu
Affiliation1.China Jiliang Univ, Coll Metrol & Measurement Engn, Hangzhou 310018, Zhejiang, Peoples R China
2.Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
4.Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA
Recommended Citation
GB/T 7714
Bei, Jianye,Xu, Xu,Zhan, Mingxiu,et al. Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022(0):1-11.
APA Bei, Jianye.,Xu, Xu.,Zhan, Mingxiu.,Li, Xiaodong.,Jiao, Wentao.,...&Wu, Angjian.(2022).Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere.ENVIRONMENTAL SCIENCE & TECHNOLOGY(0),1-11.
MLA Bei, Jianye,et al."Revealing the Mechanism of Dioxin Formation from Municipal Solid Waste Gasification in a Reducing Atmosphere".ENVIRONMENTAL SCIENCE & TECHNOLOGY .0(2022):1-11.
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