Similar articles

Abstract: Assessment of mass transfer characteristics of pervaporation (PV) treatment of wastewater contaminated with chlorinated hydrocarbons is of great importance for water treatment plant operators conducting initial evaluation, process optimization, and process economics. While a membrane plays a central role in pervaporation processes and separation efficiency, the mass transfer in the liquid layer next to the membrane surface is of equal, if not greater importance. It is one of the few process parameters that can be adjusted in situ to manipulate the outcome of a pervaporation process. In this study, a bench scale pervaporation experiment of removing a common chlorinated hydrocarbon from water was carried out and the results of it were compared to the ones based on well-known semi-empirical correlations. The mass transfer coefficients from the experiments, ranging from 0.8×10⁻⁵~2.5×10⁻⁵ m/s under the operating conditions, are higher than those predicted by the correlation. The corresponding separation factors under varying flow velocities are determined to be between 310~950.

[1] Dotremont, C., Goethaert, S., Vandecasteele, C., 1993. Pervaporation behaviour of chlorinated hydrocarbons through organophilic membranes. Desalination, 91(2):177-186.

[2] Hunter, P.S., Oyama, T., 2000. Control of Volatile Organic Compound Emissions: Conventional and Emerging Technologies. John Wiley & Sons, New York.

[3] Jiang, J.S., Vane, L.M., Sikdar, S.K., 1997. Recovery of VOCs from surfactant solutions by pervaporation. Journal of Membrane Science, 136(1-2):233-247.

[4] Lipnizki, F., Trägårdh, G., 2001. Modelling of pervaporation: models to analyze and predict the mass transport in pervaporation. Separation and Purification Methods, 30(1):49-125.

[5] Love, O.T., Eliers, R.G., 1982. Treatment of drinking water containing trichloroethylene and related industrial solvents. Journal of American Water Works Association, 74:413-425.

[6] Michaels, A.S., 1995. Effects of feed-side solute polarization on pervaporative stripping of volatile organic solutes from dilute aqueous solution: a generalized analytical treatment. Journal of Membrane Science, 101(1-2):117-126.

[7] Mulder, M., 1991. Basic Principles of Membrane Technology. Kluwer Academic Publishers, Dordrecht.

[8] Peng, M., Vane, L.M., Liu, S.X., 2003. Recent advances in VOCs removal from water by pervaporation. Journal of Hazardous Materials, 98(1-3):69-90.

[9] Pereira, C.C., Habert, A.C., Nobrega, R., Borges, C.P., 1998. New insights in the removal of diluted volatile organic compounds from dilute aqueous solution by pervaporation process. Journal of Membrane Science, 138(2):227-235.

[10] Psaume, R., Aptel, P., Aurelle, Y., Mora, Y.C., Bersilion, J.L., 1988. Pervaporation: importance of concentration polarization in the extraction of trace organics from water. Journal of Membrane Science, 36(2):373-384.