Diffusion-Controlled Organic Solute Mass Transport in Nanofiltration Systems

摘要

Permeate water quality from reverse osmosis (RO) and nanofiltration (NF) systems is a function of solvent and solute transport through the membrane film, to the permeate side. Mass transport theories describe two potential methods of solute transport through a membrane film: 1) Diffusion through molecular pores, via Brownian motion, at a rate dependent on the differential concentration; and 2) size-exclusion, in which solute passage is solely a function of a pore-size (all species smaller than the pore-size pass through, all larger species are completely rejected).