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.
| File Size : | 1
file |
| ISBN(s) : | 0898676525 |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 20 |
| Published : | 01/01/1992 |
