颗粒层中非水相液体污染物冲洗排出速度的数值模拟  

Numerical simulation of outflow velocities while flushing NAPLs from particle layers

作　　者：李笛[1] 张发根[1] 张建恒 

机构地区：[1]广州大学环境科学与工程学院、珠江三角洲水质安全与保护实验室,广州510006 [2]云浮广业硫铁矿集团有限公司化工厂,云浮527300

出　　处：《环境工程学报》2014年第2期795-800,共6页Chinese Journal of Environmental Engineering

基　　金：广州市属高校科技计划项目(08C080);广东省科技计划项目(2010B030900008)

摘　　要：在进行污染土壤的冲洗修复时,模型模拟是极具优势的预测净化效果的方法。本研究分别采用5种粒径的球形玻璃微珠模拟实际土壤,实验考察了玻璃微珠颗粒层中水和非水相液体的排出速度,给出了颗粒层中液含率分布函数,以及最大和最小颗粒层孔隙直径的定义,建立了一个描述颗粒层中水和非水相液体排出速度的多孔介质孔隙毛细管束模型。使用构建的模型模拟水和异辛烷在颗粒层中的排出速度,模拟结果与实验数据有很好的一致性,模型预测结果的平均相对误差小于6.4%,特别是对粒径较小颗粒层,预测的准确性更高。模型可作为进一步研究在非水相液体饱和土壤水冲洗修复时,水和非水相液体排出速度和修复效果的基础。Model simulation is a very effective measure in predicting the purification performance while conducting contaminated soil flushing and remediation After simulating actual soils by adopting five-sized glass beads and investigating the outflow velocities of water and NAPLs on the glass bead-layers, the research summa- rized the distribution functions of liquid holdup on particle layers and the definition formulas of the maxim and minimum pore diameters among the particle layers and then established a model of capillary tubes pack among porous medium to describe the outflow velocities of water and NAPLs. The resulting outflow velocities of water and isooctane simulated from the newly established model are consistent with the experimental data. And the av- erage relative error of the models results is less than 6.4%. The simulating results are more precise on predicting the performance of relatively small-sized particle layers. The model can provide element task on farther researc- hing the outflow velocities of water and NAPLs and remediation effects of NAPLs and soil flushing remediation.

关 键 词：土壤冲洗 颗粒层 污染 非水相液体模型 

分 类 号：X53[环境科学与工程—环境工程]