A low pressure NF system is being evaluated for producing pure water from groundwater. It is to be blended with bypassed water for a softened drinking water supply. Make an order of magnitude estimate* of the required pressure differential ( Δ P ) if the difference in osmotic pressure must be 30 kPa. The mass transfer coefficient for water flux is 8.40 × 10 –4 m3/d · m2 · kPa and the required volumetric flux of water is 30 L/h · m2.
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