The increase in the diffusion coefficient for the reverse-osmosis filtration of aqueous solutions of salts
A model of nanofiltration taking into account advective and diffusive mass-transfer is considered. The effect increasing the ion diffusion Fick coefficients with decreasing pore size, which can be explained by the influence of ion hydration and decrease the effect of repulsion of the ions. An empirical dependence of permeability on pore size, having the nature of the inverse power law is received. On the basis of the decision it is shown that in the conditions of partial drainage of a liquid from the pressure head chamber more effective is the single-stage variant of assignment in comparison with multistage version (at a constant flow of the fluid).