论文摘要
In this work, microwave treatment was introduced to a hydrothermal treatment process to degrade PCDD/Fs（Polychlorinated dibenzo-p-dioxins and dibenzofurans） in municipal solid waste incineration（MSWI） fly ash. Three process additives（NaOH, Na2HPO4, H2 O）, temperatures（150 °C, 185 °C, 220 °C）and reaction times（1 h, 2 h, 3 h） were investigated to identify their effect on the disposal of fly ash samples through orthogonal experiments. High-resolution gas chromatography–mass spectrometry（HRGC/MS） was applied to determine the PCDD/F concentrations in MSWI fly ash. The experimental results revealed that 83.7% of total PCDD/Fs was degraded. Reaction temperature was the most important factor for the degradation of the total PCDD/Fs. Both direct destruction and chlorination reactions（the chlorination degree of PCDFs increased） took part in the degradation of PCDD/Fs in fly ash, which was a new discovery. Several PCDD/F indexes determined by the concentration of indicative congeners were found to quantitatively characterize the dioxin toxicity of the fly ash. Furthermore, heavy metals in the fly ash sample were solidified using microwave-assisted hydrothermal treatment, which provided an experimental basis for the simultaneous disposal of dioxins and heavy metals. Thus, the microwave-assisted hydrothermal process should be considered for the future disposal of MSWI fly ash.
论文目录
文章来源
类型: 期刊论文
作者: Qili Qiu,Xuguang Jiang,Guojun Lü,Zhiliang Chen,Shengyong Lu,Mingjiang Ni,Jianhua Yan,Xiaobing Deng
来源: Chinese Journal of Chemical Engineering 2019年07期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 燃料化工
单位: State Key Laboratory of Clean Energy Utilization, Zhejiang University
基金: Supported by the Innovative Research Groups of the National Natural Science Foundation of China(51621005),the National Natural Science Foundation of China(51676172)
分类号: TQ536.4
页码: 1708-1715
总页数: 8
文件大小: 792K
下载量: 5
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