TY - JOUR
T1 - Detoxification of municipal solid waste incinerator (MSWI) fly ash by single-mode microwave (MW) irradiation
T2 - Addition of urea on the degradation of Dioxin and mechanism
AU - Deng, Dongyang
AU - Qiao, Junqin
AU - Liu, Mingqing
AU - Kołodyńska, Dorota
AU - Zhang, Manwen
AU - Dionysiou, Dionysios D.
AU - Ju, Yongming
AU - Ma, Jun
AU - Chang, Moo been
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/5/5
Y1 - 2019/5/5
N2 - 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 N2 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 °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.
AB - 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 N2 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 °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.
KW - Dechlorination
KW - Fly ash
KW - Hot spots
KW - Microwave
KW - Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs)
UR - http://www.scopus.com/inward/record.url?scp=85061549015&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.01.001
DO - 10.1016/j.jhazmat.2019.01.001
M3 - 期刊論文
C2 - 30780024
AN - SCOPUS:85061549015
SN - 0304-3894
VL - 369
SP - 279
EP - 289
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -