An optimum design of a forward osmosis(FO)module as the objective of increasing water flux of the FO module were studied. A numerical analysis has been conducted, for which the module model was based on the hemodiafilter model including the 3CP(Concentration Polarization)model as the membrane transport. The membrane properties of
A,
B and
BS values and the geometries of hollow fiber membrane as the membrane formation factors, and the flow rates of both feed solution(FS)and draw solution(DS)and the flow orientations namely AL- facing - FS mode and AL- facing - DS mode, as the operational condition factors are found for the optimum design items. As a result it was proved quantitatively that
A value is the most effective constant among these items and
BS value appearing specifically in the FO system is the second most effective constant, while
B value scarcely and unpredictively influences the water flux.
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