通过使用浓度驱动膜工艺进行溶剂萃取，可以快速去除水中的挥发性和半挥发性有机化合物。所研究的每种化合物的传质速率相似。挥发性污染物从水中去除的速率仅受膜表面附近水相中扩散速率的限制。半挥发性化合物通过扩散进入和通过膜孔的方式，其传质速率受到限制，尽管这种限制不会严重抑制整体传质速率。气相转移和孔表面扩散可以并行作用，为污染物通过膜的移动提供机制。溶剂萃取系统的传质特性可以根据实验室实验和传热传质文献建立的传质模型进行预测。集中的一些优点和缺点- 确定了驱动系统与压力驱动膜分离过程的比较。

Rapid removal of volatile and semi-volatile organic compounds from water can be achieved by solvent extraction using a concentration-driven membrane process. The rate of mass transfer of each of the compounds studied is similar. Volatile contaminants are removed from water at a rate which is limited only by the rate of diffusion in the aqueous phase near the membrane surface. The semi-volatile compounds are limited in their rate of mass transfer by diffusion into and through the membrane pores, though the limitation does not seriously inhibit the overall rate of mass transfer. Gas phase transfer and pore surface diffusion may act in parallel to provide mechanisms for movement of the contaminants through the membrane. The mass transfer characteristics of the solvent extraction system can be predicted based on a mass transfer model developed from laboratory experiments and heat and mass transfer literature. Some advantages and disadvantages of the concentration-driven system as compared to pressure-driven membrane separation processes were identified.