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Water flux before and after the experiment with lactic acid for NF270, MPF-36, Toray NF, and Alfa Laval NF membranes. (a) at pH 2.8, T: 25 °C and 32 bar. (b) at pH 2.8, T: 40 °C and 32 bar. (c) at pH 3.9, T: 25 °C and 32 bar. (d) at pH 6.0, T: 25 °C and 32 bar.
