Furthermore, the membrane flux showed a negative trend, indicating that the separation layer swelling of the nanofiltration membrane decreased the effective filter pore size, increasing the rejection of salvianolic acid B.
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Ultrasonic-assisted nanofiltration separation recovering salvianolic acid B from ethanol wastewater.
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The sentences
The rejections of rosmarinic acid and salvianolic acid B showed a decreasing trend with an increase in ultrasonic power or a decrease in pH; however, when the concentration of ethanol was increased from 5 % to 35 %, the salvianolic acid B rejection increased from 84.96 % to 96.60 % and the rosmarinic acid rejection decreased from 35.09 % to 17.51 %.