Abstract
Membrane capacitive deionization (MCDI) is a water desalination technique based on applying a cell voltage between two oppositely placed porous electrodes sandwiching a spacer channel that transports the water to be desalinated. In MCDI, ion-exchange membranes are positioned in front of each porous electrode to prevent co-ions from leaving the electrode region during ion adsorption, thereby enhancing the salt adsorption capacity. MCDI can be operated at constant cell voltage (CV), or at a constant electrical current (CC). In this paper, we present both experimental and theoretical results for desalination capacity and rate in MCDI (both in the CV- and the CC-mode) as function of adsorption/desorption time, salt feed concentration, electrical current, and cell voltage. We demonstrate how by varying each parameter individually, it is possible to systematically optimize the parameter settings of a given system to achieve the highest average salt adsorption rate and water recovery.
| Original language | English |
|---|---|
| Pages (from-to) | 1941-1952 |
| Journal | Water Research |
| Volume | 47 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2013 |
Keywords
- water quality
- water
- recovery
- desalination
- ionization
- ion exchange treatment
- membranes
- ion-exchange membranes
- porous-electrodes
- water desalination
- brackish-water
- transport-properties
- carbon
- electrochemistry
- performance
- efficiency
- anions