非均质介质泡沫冲洗污染物去除机制研究

项目名称： 非均质介质泡沫冲洗污染物去除机制研究

项目编号： No.41272248

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 陈家军

作者单位： 北京师范大学

项目金额： 70万元

中文摘要： 包气带土壤普遍具有非均质特性，严重影响着原位冲洗修复污染物的去除效率。以多孔介质流体动力学、表面物理化学和土壤污染修复原理为基础，从提高非均质介质冲洗液冲洗波及率、污染物去除率出发，采用铸体技术、薄片加工技术结合微观图像采集技术、化学测试分析手段和数学模拟方法，从孔隙尺度研究非均质介质孔隙形态与结构特征、典型有机氯农药(OCPs)的赋存特征、介质中泡沫流动特性和OCPs相间转移、输移去除机制，揭示非均质介质中泡沫挤压和占据作用及选择性封堵作用和提高不同孔道流动均匀性、冲洗波及率的机制，确定非均质介质孔隙特征、泡沫特性和泡沫流动之间的定量关系及对介质中泡沫渗透性影响的定量关系，探索表面活性剂泡沫冲洗中对OCPs的增溶和剪切携带机制，建立模拟OCPs污染多孔介质泡沫冲洗修复的流动与污染物运移数学模型，为提高实际土壤污染的表面活性剂冲洗技术的污染物去除效率和实际工程应用提供理论依据和实验支持。

中文关键词： 泡沫冲洗；表面活性剂；非均匀介质；污染物去除；波及效率

英文摘要： Heterogeneity of soils in an unsaturated zone is common and it brings negative impact on efficiency of contaminant removal seriously in soil flushing. For the purpose of increasing sweep efficiency of washing agent and contaminant removal, based on the theory of fluid dynamics in porous media, surface physical chemistry and soil remediation, the pore-scale morphology and structure of heterogeneous media, the residence feature of organic-chlorine pesticides(OCPs) in heterogeneous media, the flow characteristics of foam and the transfer and transport of OCPs are studied, by adopting the casting, slice processing and image acquisition technique and by using the chemical analysis and mathematical simulation. The mechanism of bubble squeeze and occupying, selective plugging, the increase of flow uniformity and the increase of sweep efficiency in heterogeneous media is investigated. The relationship among the pore characteristic, foam texture and the foam mobility and the effect of this relationship on foam conductivity is quantified. The OCPs solubilization, shearing and carrying mechanism by foam is also investigated when flushing are performed. The mathematical model is developed to simulate the transport and transfer of contaminants when foam flushing is performed and to provide the theoretical basis and experime

英文关键词： foam flushing；surfactant；heterogeneous media；contaminant removal；sweep efficiency