Affordable Access

Publisher Website

Seawater predesalination with electrodialysis

Authors
Journal
Desalination
0011-9164
Publisher
Elsevier
Volume
342
Identifiers
DOI: 10.1016/j.desal.2013.07.012
Keywords
  • Electrodialysis
  • Seawater Desalination
  • Electro-Osmosis
  • Osmosis
  • Coulombic Efficiency

Abstract

Abstract The suitability of ED for seawater desalination was investigated and we quantified the energy losses that play a role in electrodialysis. The combination of electrodialysis (ED) and brackish water reverse osmosis (BWRO) is presented as an alternative desalination strategy for seawater reverse osmosis (SWRO). Experiments have been performed with a recycling batch electrodialyzer. From this we conclude that in most cases the membrane stack is responsible for the main energy loss in the system. Energy losses due to water transport are generally low. At low applied current density, osmotic water transport is relatively large and as such the energy loss, while electroosmosis was found to be directly proportional to the applied current density. The relative energy loss caused by back diffusion was found to be only of minor importance for higher current densities and was only more pronounced at the lowest applied current density of 10A/m2. Combining ED with BWRO in a hybrid system does not lead to a reduction in energy consumption compared to ED as standalone technique, when the applied current density becomes lower than 50A/m2. At low applied current density (10A/m2) ED can perform desalination energetically cheaper at lower operational costs than SWRO.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Seawater desalting by electrodialysis

on Desalination Jan 01, 1977

Seawater electrodialysis with preferential removal...

on Journal of Membrane Science Feb 15, 2014
More articles like this..