Unravelling pH Changes in Electrochemical Desalination with Capacitive Deionization.

ABSTRACT: Membrane capacitive deionization (MCDI) is a water desalination technology employing porous electrodes and ion-exchange membranes. The electrodes are cyclically charged to adsorb ions and discharged to desorb ions. During MCDI operation, a difference in pH between feed and effluent water is observed, changing over time, which can cause the precipitation of hardness ions and consequently affect the long-term stability of electrodes and membranes. These changes can be attributed to different phenomena, which can be divided into two distinct categories: Faradaic and non-Faradaic. In the present work, we show that during long-term operation, as the electrodes age over time, the magnitude and direction of pH changes shift. We studied these changes for two different feed water solutions: a NaCl

SUBMITTER: Arulrajan AC 

PROVIDER: S-EPMC8529871 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature