期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 369, 期 -, 页码 279-289出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.01.001
关键词
Polychlorinated dibenzo-p-dioxins and; dibenzofurans (PCDD/Fs); Fly ash; Microwave; Hot spots; Dechlorination
资金
- Science and Technology Plan Project of Guangzhou City [201804020022]
- International Cooperation Project of Guangdong Province [2018A050506045]
- Natural Science Foundation of Guangdong Province [2018A030313226]
- Pollution Prevention Innovative Technology and Process Project of Guangzhou City Environmental Protection Agency (2018-2020)
- Central Fund Supporting Nonprofit Scientific Institutes for Basic Research and Development [PM-zx703-201602-066]
- Project for Hundreds of Talents of Environmental Protection (2014-2016)
The detoxification of municipal solid waste incinerator (MSWI) fly ash dioxins urgently requires an effective treatment technology. In this study, we adopted a single-mode microwave (MW)-based pyrolysis to treat MSWI fly ash under N-2 atmosphere and further elucidated the main influencing factors, including the chemical inhibitor, for dioxin control. The results show that (1) the detoxification process was optimized with a mass ratio of fly ash to SiC of 1:9, 23.1% (wt%) urea addition and pyrolysis temperature of -480 degrees C; (2) the total polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) destruction efficiency and the bioassay-derived 2,3,7,8-TCDD toxic equivalent (Bio-TEQ) removal efficiency reached 98.5% and 97.9%, respectively, accompanied with 1.3% of the total amount of dioxin being submitted to exhaust gas; (3) the MW-based pyrolysis of urea (133-300 C) was favourable for the generation of hot spots as well as the PCDD/F rapid destruction in fly ash. In addition, the leaching toxicity of heavy metals was also partially reduced after MW pyrolysis reactions. To the best of our knowledge, this is the first report adopting a MW-based pyrolysis to eliminate dioxin in MSWI fly ash with the addition of urea, which is a promising alternative to current methods.
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