Leaching Characteristic of Trace Element in UCG Residues
Leaching experiments on Underground Coal Gasification (UCG) residues were performed and the contents of trace elements, such as Pb, Cd, Zn and As in residues and leachate were measured by Atomic Absorption Spectroscopy (AAS) and silver diethyldithiocarbamate (Ag-DDC) respectively in this paper. Leaching tests included two parts, one was standard leaching test (referred as test Ⅰ in the following text), that means adopting the test method standard for leaching toxicity of solid waste (GB5086.2-1997) and the other was continuous leaching test (referred as test Ⅱ in the following text). It was found that only Zn and Pb were determined in test Ⅰand their maximum concentrations were 0.146 mg/L and 0.126 mg/L respectively. The determined two trace elements had no similar leaching characteristic. While in test Ⅱ, only Zn and Cd were determined and their maximum concentrations were 0.028 mg/L and 0.013 mg/L. Furthermore, the leaching curves appeared no obvious depressed trend along leaching time. The environmental impacts of the four trace elements on ground water were evaluated referring to the environmental quality standard of ground water.
underground coal gasification residues trace element leaching environmental impact
LIANG Jie LI Yulan SUN Chuengjiang LIU Xin
Xinwen Mining Group Co.Ltd,Taian 271233,Jinan,China Department of Chemical and Environmental Enginee Department of Chemical and Environmental Engineering,China University of Mining & Technology,Beijing Xinwen Mining Group Co.Ltd,Taian 271233,Jinan,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
477-481
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）