RATE-LIMITED MASS-TRANSFER AND TRANSPORT OF ORGANIC SOLUTES IN POROUS-MEDIA THAT CONTAIN IMMOBILE IMMISCIBLE ORGANIC LIQUID
RATE-LIMITED MASS-TRANSFER AND TRANSPORT OF ORGANIC SOLUTES IN POROUS-MEDIA THAT CONTAIN IMMOBILE IMMISCIBLE ORGANIC LIQUID
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DOI：
10.1029/91wr02498
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发表时间：
1992-01-01
影响因子：
5.4
通讯作者：
BRUSSEAU, ML
中科院分区：
文献类型：
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作者：
BRUSSEAU, ML
提出了一个通用模型，模拟了一个固定的不混溶有机液体，以及速率限制的固相吸附，在非均质多孔介质中的溶解有机污染物的传输效果。建立了四种情况下的具体模型：（1）不流动的不混溶液体存在于非均质多孔介质的非平流区域中;（2）不流动的不混溶液体存在于平流区域中;（3）均质多孔介质中不混溶液体内部以及穿过液-水界面的传质是速率限制的;（4）具有单一阻力的均质多孔介质。通过尝试预测文献中报道的穿透曲线来评估基于双电阻的单电阻模型的性能。基于成功的数据预测，其中所有参数的值都是独立于模拟的数据获得的，看来模型的概念基础是有效的。通过一系列的模拟，不混溶液体对保留的影响被证明是巨大的，即使在相对较低的饱和度水平。即使当不混溶液体和水之间的质量传递迅速时，位于水力传导率相对较低的区域内的残余饱和度中的溶质释放也可能受到显着的速率限制。这对基于施加的水力梯度的补救系统的功效产生了影响（例如，泵送和处理）。该模型应被证明是有用的，在进一步调查的影响不流动的不混溶有机液体的保留和传输的有机溶质在多孔介质中。
A general model is presented that simulates the effect of an immobile immiscible organic liquid, as well as rate-limited solid phase sorption, on the transport of dissolved organic contaminants in heterogeneous porous media. Specific models are developed for four cases (1) immobile immiscible liquid that resides in nonadvective domains, of a heterogeneous porous medium; (2) immobile immiscible liquid that resides in the advective domain; (3) homogeneous porous media wherein mass transfer within the immiscible liquid, as well as across the liquid-water interface, is rate limited; (4) homogeneous porous media with a single resistance to liquid-liquid mass transfer. The performance of the homogeneous-based, single-resistance model was evaluated by attempting to predict a breakthrough curve reported in the literature. Based on the successful prediction of the data, where values for all parameters were obtained independent of the data being simulated, it appears that the conceptual basis of the model is valid. Through a series of simulations, the effect of the immiscible liquid on retention was shown to be great, even at relatively low levels of saturation. Release of solute from residual saturation located within regions of-relatively low hydraulic conductivity can be significantly rate limited, even when mass transfer between immiscible liquid and water is rapid. This has ramifications concerning the efficacy of remediation systems based on imposed hydraulic gradients (e.g., pump-and-treat). The model should prove useful in further investigations of the effect of immobile immiscible organic liquids on the retention and transport of organic solutes in porous media.