Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (11): 139-146.doi: 10.3969/j.issn.1000-565X.2017.11.020

• Environmental Science & Technology • Previous Articles    

Formation and Migration of Dioxins in Updraft Fixed-Bed Gasifier for Disposing Domestic Solid Waste

LEI Ming1,2 HAI Jing3 LU Jia-wei3 REN Ming-zhong3 ZHANG Su-kun3 CHENG Jiang1   

  1. 1.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 501640,Guangdong,China.2.Jiangmen City Disposal Service Center of Solid Waste,Jiangrnen 529000,Guaongdong,China; 3.South China Institute of Environmental Sciences,the Ministry of Environmental Protection,Guangzhou 510655,Guangdong,China
  • Received:2017-01-04 Revised:2017-04-18 Online:2017-11-25 Published:2017-10-01
  • Contact: 程江(1965-)，男，教授，博士生导师，主要从事传质与分离工程研究． E-mail:cejcheng@scut.edu.cn
  • About author:雷鸣(1987-)，男，博士生，主要从事垃圾焚烧污染物排放控制研究． E-mail:celeiming@ mail．scut．edu．cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(51608223) and the Science and Technology Planning Project of Guangdong Province(2013B090600134)

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Abstract: The formation and migration of dioxins were investigated by analyzing the distribution characteristics of dioxins in all output products from a updraft fixed bed gasifier for disposing domestic solid waste.The results show that after the purification of the wet scrubbing coupled with an electric tar precipitator,the content of dioxins in the flue gas of the gasifier output is 0. 48ng I-TEQ/Nm 3 ,and the contents of dioxins in the scrubbing water and the tar are higher,which are respectively 8259. 50ng I-TEQ/L and 5941. 84ng I-TEQ/kg,and that the total emission factor of dioxins in the gasifier system is 165. 86μg I-TEQ/t,of which 96. 06% is emitted by the residual,3. 58% by the tar,and only 0. 35% is discharged with the flue gas.Therefore,the residue is the main emission resource of dioxins,which is obviously different from the municipal solid waste incineration.The similar distribution characteristics of dioxins in the residues,the scrubbing waste,the tar and the flue gas indicate that dioxins are generated in the gasifier chamber rather than the process of flue gas cleaning.Thus,it is suggested that the effective control of the generation of dioxins within the gasifier chamber is the key when the updraft fixed bed gasifier is used to dispose solid waste.

Key words: waste treatment, updraft fixed bed gasifier, domestic solid waste, dioxins, distribution characteristic, emission

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