Water flux in Pressure Retarded Osmosis

作者：Bazhin Nikolai M

来源：Desalination, 2015, 375: 21-23.

DOI：10.1016/j.desal.2015.07.027

• Diffusion
• Feed solution
• Draw solution
• Water permeability coefficient
• Pressure Retarded Osmosis

The transport of water through a semipermeable membrane in Pressure Retarded Osmosis (PRO) has been considered. The water flux is believed to consist of two components. The water flux from feed to draw solution is due to the difference in the water concentrations of feed and draw solutions. This flux is controlled by diffusion in accordance with Fides Law. Second flux from draw to feed solution is caused by pressure applied to the draw solution. The total flux is proportional to the difference between the osmotic pressure and that applied to the draw solution. The membrane is assumed to be a set of several homogeneous layers of different thickness and with various diffusion coefficients. Each homogeneous layer can be characterized by diffusion resistance. The diffusion resistance of the membrane (r) is the sum of the diffusion resistance of individual layers. The water permeability coefficient (A) depends on the membrane diffusion resistance A = 1/(RTr).

• 出版日期2015-11-2