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颗粒层中非水相液体污染物冲洗排出速度的数值模拟

Keywords: 土壤冲洗,颗粒层,污染,非水相液体,模型

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Abstract:

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。

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