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首页> 外文期刊>Journal of Hazardous Materials >Transport and fate of volatile organic chemicals in unsaturated, nonisothermal, salty porous media: 2. Experimental and numerical studies for benzene
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Transport and fate of volatile organic chemicals in unsaturated, nonisothermal, salty porous media: 2. Experimental and numerical studies for benzene

机译：挥发性有机化学物质在不饱和，非等温，咸性多孔介质中的迁移和归宿：2.苯的实验和数值研究

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摘要

Simultaneous transport in soil of heat, water, potassium chloride, and benzene was studied experimentally and numerically. A laboratory experiment permitted observation of temperature, water content, chloride concentration and benzene concentration distributions in soil. A numerical model based upon newly developed transport theory was used to simulate the observed data. Transport of benzene in soils was simulated numerically under isothermal and nonisothermal conditions. Simulated results for benzene were compared with experimental data. Experiments were conducted in sealed aluminum columns (0.05-m I.D. and 0.20-m length) with sterilized salinized unsaturated Fayette soil. The soil had initial water content of 0.22 m~3/m~3 and initial inorganic solute concentration of 0.20 mol/kg. Benzene was injected at one end of each soil column (top end) to provide l43 g/m~3 benzene in the upper 0.0l m portion. The isothermal soil columns were set in an incubator at 29deg.C. The nonisothermal experiment had upper and lower boundary temperatures of 34 and 2ldeg.C, respectively. Isothermal and nonisothermal experiments each lasted for seven days. A numerical model based upon heat and mass transfer theory was used to predict transient soil temperature, water content, and inorganic and organic chemical distribu- tions. Both predicted and measured final temperatures showed linear distributions. In the non- isothermal study, water moved from the hot region toward the cold region, and inorganic solute accumulated in the hot region. Benzene redistributed along the soil column for both isothermal and nonisothermal conditions. Total concentration of benzene in the cold region under nonisother- mal conditions was larger than the concentration of benzene in the hot region. On the other hand, the concentration of total benzene was approximately uniform along the soil column under isothermal conditions. For isothermal conditions, the benzene concentration by volume in the three phases followed the order: liquid > solid > gas.
机译：实验和数值研究了热，水，氯化钾和苯在土壤中的同时迁移。一项实验室实验允许观察土壤中的温度，水含量，氯化物浓度和苯浓度分布。基于新开发的运输理论的数值模型用于模拟观测数据。在等温和非等温条件下，模拟了苯在土壤中的迁移。将苯的模拟结果与实验数据进行了比较。实验是在装有灭菌盐渍化不饱和费耶特土壤的密封铝柱（内径为0.05米，长度为0.20米）中进行的。土壤的初始含水量为0.22 m〜3 / m〜3，初始无机溶质浓度为0.20 mol / kg。在每个土壤柱的一端（顶端）注入苯，以在0.0l m的上部提供143 g / m〜3的苯。将等温土壤柱放在29℃的培养箱中。非等温实验的上限温度和下限温度分别为34和2lC。等温和非等温实验分别持续7天。一个基于传热和传质理论的数值模型被用来预测土壤的瞬时温度，水含量以及无机和有机化学分布。预测和测量的最终温度均显示线性分布。在非等温研究中，水从热区移向冷区，无机溶质聚集在热区。在等温和非等温条件下，苯沿土壤柱重新分布。在非等温条件下，寒冷地区的苯总浓度大于高温地区的苯浓度。另一方面，在等温条件下，沿土壤柱的总苯浓度大致均匀。对于等温条件，三相中苯的体积浓度遵循以下顺序：液体>固体>气体。

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