| 不同含水量细砂介质中挥发苯的有效扩散系数研究 |
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| 引用本文： | 高文谦,刘菲,陈鸿汉,许文婕. 不同含水量细砂介质中挥发苯的有效扩散系数研究[J]. 生态与农村环境学报, 2009, 25(1) |
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| 作者姓名： | 高文谦 刘菲 陈鸿汉 许文婕 |
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| 作者单位： | 中国地质大学水资源与环境工程北京市重点实验室,北京,100083 |
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| 基金项目： | 中国科技部国际合作项目,国家自然科学基金 |
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| 摘 要： | 挥发性有机污染物在土壤多孔介质中的有效扩散系数是土壤气相抽提(soil vapor extraction,SVE)传质过程中的一个重要参数.笔者以苯为研究对象,采用土柱扩散试验,对不同含水量条件下挥发苯在细砂介质中的有效扩散系数和扩散规律进行研究.结果表明,对于吸附型矿物含量少的细砂介质,含水量大小在一定程度上影响了挥发苯的扩散过程.含水量在50 g·kg-1时,扩散最快;低于50 g·kg-1时,随含水量增大扩散能力增强;高于50 g·kg-1时,扩散能力则随含水量增大而减弱.同一扩散柱中,随着扩散距离增加,挥发苯的有效扩散系数增大,这可能与其蒸汽分压降低有关.
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| 关 键 词： | 挥发苯 有效扩散系数 含水量 扩散 |
Effective Diffusion Coefficient of Volatile Benzene in Medium of Fine Sands Different in Water Content |
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| GAO Wen-qian,LIU Fei,CHEN Hong-han,XU Wen-jie. Effective Diffusion Coefficient of Volatile Benzene in Medium of Fine Sands Different in Water Content[J]. Journal of Ecology and Rural Environment, 2009, 25(1) |
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| Authors: | GAO Wen-qian LIU Fei CHEN Hong-han XU Wen-jie |
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| Affiliation: | China University of Geosciences/Beijing Key Laboratory of Water Resources & Environment Engineering;Beijing 100083;China |
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| Abstract: | Effective diffusion coefficient of VOCs in porous medium is an important parameter in the process of mass transfer of soil vapor extraction(SVE).To study effective diffusion coefficient and diffusion law of volatile benzene in media of fine sands different in water content,a soil column diffusion experiment was carried out.Results show that water content affected diffusion of volatile benzene to a certain extent in such a medium as fine sands containing little adsorptive clay mineral.The diffusion rate was ... |
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| Keywords: | volatile benzene effective diffusion coefficient water content diffusion |
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