Characterization of mechanochemical treated fly ash from a medical waste incinerator  

作　　者：Zheng Peng Qiong Ding Yangzhao Sun Chen Jiang Xinhua Gao Jianhua Yan 

机构地区：[1]Foreign Economic Cooperation Office, Ministry of Environmental Protection, Beijing 100035, China. [2]State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Environmental Sciences》2010年第10期1643-1648,共6页环境科学学报（英文版）

基　　金：supported by the Zhejiang Province Natural Science Foundation(No.X206955,Z506214)

摘　　要：The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400 r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analytical methods including High Resolution Gas Chromatograph/High Resolution Mass Spectrometer, Mastersizer 2000 Particle Size Analyzer, QUADRASORBTM SI Surface Area Analyzer, Scanning Electron Microscopy and X-ray diffraction. Results showed that abatement efficiency of polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans （PCDDs/Fs） in terms of total concentration averagely amount to 76% which was relatively higher than that of I-TEQ concentration averagely amount to 56%; the most concentration of toxic congeners as well as isomers of PCDDs/Fs decreased after mechanochemical treatment. The treated fly ash was characterized by a more homogeneous distribution of concaves as well as the significant decreasing in overall particle size and great enlargement in surface area. The major crystallization phases or intensities were considerably changed by mechanochemical treatment, of which a new phase containing chlorine formed may be a possible factor suggesting chlorination reaction occurring on the crystalline surface.The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400 r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analytical methods including High Resolution Gas Chromatograph/High Resolution Mass Spectrometer, Mastersizer 2000 Particle Size Analyzer, QUADRASORBTM SI Surface Area Analyzer, Scanning Electron Microscopy and X-ray diffraction. Results showed that abatement efficiency of polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans （PCDDs/Fs） in terms of total concentration averagely amount to 76% which was relatively higher than that of I-TEQ concentration averagely amount to 56%; the most concentration of toxic congeners as well as isomers of PCDDs/Fs decreased after mechanochemical treatment. The treated fly ash was characterized by a more homogeneous distribution of concaves as well as the significant decreasing in overall particle size and great enlargement in surface area. The major crystallization phases or intensities were considerably changed by mechanochemical treatment, of which a new phase containing chlorine formed may be a possible factor suggesting chlorination reaction occurring on the crystalline surface.

关 键 词：PCDDs/Fs CHARACTERIZATION fly ash mechanochemical treatment 

分 类 号：X799.5[环境科学与工程—环境工程] X770.5