溶气异相析出微气泡在石油污染土壤清洗中增效机理的研究

项目名称： 溶气异相析出微气泡在石油污染土壤清洗中增效机理的研究

项目编号： No.21277023

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 环境科学、安全科学

项目作者： 陈泉源

作者单位： 东华大学

项目金额： 80万元

中文摘要： 为了改善石油污染土壤淋洗效率，避免二次污染，本项目采用鼠李糖脂调控界面张力，利用溶解气体在土壤颗粒表面原位异相析出微气泡强化土壤颗粒表面及毛细孔隙中油污卷离。拟采用原子力显微镜、激光散射、显微高速摄像等分析测试手段，研究土壤颗粒表面石油卷离和原位析出微气泡的诱导效应；采用原子力显微镜测定气泡/油珠/土壤颗粒界面作用力和土壤颗粒表面微观接触角，研究油污在气泡表面铺展聚集过程；基于颗粒、油珠、气泡ζ电位和表面能分量(γLW、γ+、γ-、γAB)测定结果，模拟计算土壤洗涤体系固/液/气界面双电层作用力、范德华力和疏水作用力，结合原子力显微镜测试的界面作用力曲线，应用扩展DLVO理论，依据界面作用能垒预测有机物聚集体在气泡表面的铺展粘附效率，研究聚集层中分子间相互作用，揭示石油污染土壤洗涤体系多元多相界面质量传递规律；建立石油污染土壤洗涤动力学模型，为加压溶气鼠李糖脂溶液洗涤石油污染土壤提供依据。

中文关键词： 污染土壤；清洗；表面活性剂；微气泡；增效作用

英文摘要： In order to improve the remediation efficiency of crude oil contaminated soil and avoid secondary pollution, micro-bubbles precipitated out from dissolved gas heterogeneously on soil particles in situ will be exploited to enhance the rollup of oil on the surface of soil particles and in the soil capillary pores with rhamnolipids to regulate the interface tension and hydrophobic aggregation behavior of crude oil and. Atomic force microscopy, laser diffraction and microscopic high speed photography will be used to investigate the dissolution, rollup, aggregation of crude oil and the induced effect of micro-bubbles formed in situ. Atomic force microscopy will be also used to measure the interface forces between bubble/oil, oil/soil and bubble/soil and to investigate the variation of surface contact angle, to observe the oil rollup and aggregation on the surface of bubbles. Based on Zeta-potential and surface tension (γLW、γ+、γ-、γAB) measurements, the electrostatic force, van der Waals force and hydrophobic force between solid/oil/gas interfaces will be simulated and calculated. Using extended DLVO theory, the spreading efficiency of oil and bubble will be predicted according to interface forces and energy barriers. The interaction of molecules in aggregates will be studied in detail. This work will reveal the mass t

英文关键词： contaminated soil；soil-washing；surfactant；micro-bubble；enhancement