Papers Published

1. Wiesner, Mark R. and Chellam, Shankararaman, Mass transport considerations for pressure-driven membrane processes, Journal of the American Water Works Association, vol. 84 no. 1 (1992), pp. 88 - 95 .
   (last updated on 2007/04/09)

   Abstract:
   Numerical simulations and experimental work for evaluating transport mechanisms for colloidal foulants in pressure-driven membrane systems are discussed. A model for concentration polarization is used to explore the role of ionic strength in determining the distribution of dissolved humic materials near a rejecting membrane. Particle trajectory theory predicts that there should exist a critical particle size above which particles will not deposit on the membrane. For conditions typical of ultrafiltration and microfiltration, which operate in laminar flow and utilize an inside-out geometry, this critical particle diameter is likely to be in the range of 10-50 μm. Qualitative evidence, based on measurements of permeate flux, supports the theoretical minimum in diffusive back-transport of particles predicted to occur for particles near 0.1 μm in size.

   Keywords:
   Computer Simulation;Water Pollution;Colloids;Flow of Water;Ultrafiltration;