Purification performance evaluation of licorice aqueous solution using modified nanofiltration membranes

The filtration performance of coupling modified polyethersulfone (PES) membrane by coupling diazonium reaction and 25 wt.% aniline modified polyethersulfone (APES /PES) blended membrane by radically diazonium reaction for treating of licorice aqueous solution was verified systematically and compared to bare NF PES membrane. The effect of operational pressure and crossflow velocity on permeation flux and rejection were evaluated. All experiments were employed in a lab scale crossflow filtration equipment with effective area of 40 cm2. The applied operational pressure and crossflow velocity were diverse from 6 to 12 bar and 0.5 to 2.5 cm/s respectively. The obtained results of rejection for licorice aqueous solution were between 84.4% to 99.2%. The durability and antifouling performance of membranes were assessed through longterm filtration of licorice aqueous solution.