Abstract

A study of the two-dimensional boundary layer equations describing reverse osmosis in a flat membrane duct reveals the existence of maximum concentration polarization phenomenon corresponding to a particular value of salt rejection ratio, which is contrary to the common belief that the extent of concentration polarization always increases as membranes become more perfect. A one-dimensional model is used to analyze the same problem and explicit relationship between membrane characteristics, operating variables and the presence of maximum concentration polarization is presented.

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