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Permeation flux (a), Salt rejection (b), Dye rejection (c) and Colour difference (d) of the NF ceramic membrane at different salt concentration (40–60 g/L) using dye and different salt NaCl and Na2SO4(Conditions: Dye conc: 0.5 g/L, pH: 8, CFV: 4 m/s, TMP = 12 bar and Temp = 40 °C).