Effect of Pulsed Electric Field on the Electrodialysis Performance of Phosphate-Containing Solutions

Abstract

A comparative analysis of mass transfer characteristics and energy consumption was carried out for the electrodialysis recovery of PV from of NaH2PO4 solutions and multicomponent (0.045 M NaxH(3−x)PO4, 0.02 M KCl, 0.045 M KOH, 0.028 M CaCl2, and 0.012 M MgCl2, pH 6.0 ± 0.1) solution in conventional continuous current (CC) and pulsed electric field (PEF) modes. The advantages of using PEF in comparison with CC mode are shown to increase the current efficiency and reduce energy consumption, as well as reduce scaling on heterogeneous anion-exchange membranes. It has been shown that PEF contributes to the suppression of the “acid dissociation” phenomenon, which is specific for anion-exchange membranes in phosphate-containing solutions. Pulse and pause lapse 0.1 s–0.1 s and duty cycle 1/2 were found to be optimal among the studied PEF parameters.

Stability of Ion Exchange Membranes in Electrodialysis

“…Not only polarity reversal can reduce the intensity of fouling, but also the use of pulsed electric fields. It was shown in [ 79 , 80 ] that the use of a pulsed electric field can significantly reduce precipitation ( Figure 10 ) due to the reduced concentration polarization due to relaxation of concentration profiles during the pause interval.…”

“…Reprinted from Ref. [ 80 ] under the terms of the Creative Commons Attribution 4.0 International License ( (accessed on 26 December 2022)). Copyright © 2022 by the authors.…”