摘要
数值模型是分析土壤油污染和设计修复方案的有利工具。本文开发了描述表面活性剂增溶、促流机制的模型,并将其集成于NAPL模型,从而构建了表面活性剂冲洗修复土壤油污染多相运移模型,此模型可用于模拟饱和带和非饱和带的情况。用表面活性剂冲洗模型模拟了柴油泄漏、重分布和表面活性剂冲洗砂介质中柴油的试验情景,模型可很好地体现表面活性剂冲洗中的增溶、促流机制,模型模拟结果与试验结果吻合较好。水冲洗对土壤中自由态油的去除效果显著,实际中可先用水冲洗,冲洗至油近残余饱和态时再用表面活性剂冲洗,以降低成本。表面活性剂冲洗较水冲洗能更快更好地修复土壤油污染。
The numerical model is a helpful tool for analyzing oil pollution in soil and designing remediation projects. The model describing mechanism of surfactant solubilization and mobilization was established, and integrated into the NAPL model, thus a multi-phase transport model was built, which could model surfactant flushing for remediation of NAPLs in soil and can be used in zone. Then the surfactant flushing model was applied into experimental scenes, in which diesel leaking, diesel redistributing and surfactant flushing of the diesel in the sand medium were modeled. The model could reflect the surfactant solubilization and mobilization mechanism excellently, the simulation results accord with the experimental results well. Water flushing has remarkable effect on wiping off the free NAPLs, in practice, the water flushing can be adopted firstly, then the surfactant flushing can be used when the NAPLs saturation reach the residual saturation, this could reduce remediation costs. Surfactant flushing can remediate the NAPLs contamination more quickly and better than water flushing.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2011年第5期614-622,共9页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助项目(40772148)
中央高校基本科研业务费专项资金(2009SD-19)资助
关键词
表面活性剂冲洗
土壤修复
油污染
增溶
促流
surfactant flushing
soil remediation
NAPLs contamination
solubilization
mobilization
