IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Print this page

Assisted reverse electrodialysis-principles, mechanisms, and potential
Vanoppen, M.; Criel, E.; Walpot, G.; Vermaas, D.A.; Verliefde, A. (2018). Assisted reverse electrodialysis-principles, mechanisms, and potential. npj Clean Water 1: 9. https://hdl.handle.net/10.1038/s41545-018-0010-1
In: npj Clean Water. Nature Publishing Group: United Kingdom. e-ISSN 2059-7037, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine

Authors  Top 
  • Vermaas, D.A.
  • Verliefde, A., more

Abstract
    Although seawater reverse osmosis (RO) is nearing its thermodynamic minimum energy limit, it is still an energy-intensive process, requiring 2–3 kWh/m³ at a recovery of 50%. Pre-desalination of the seawater by reverse electrodialysis (RED), using an impaired water source, can further decrease this energy demand by producing energy and reducing the seawater concentration. However, RED is hampered by the initial high resistance of the fresh water source, resulting in a high required membrane area (i.e., high investment costs). In this paper, a new process is presented that can overcome this initial resistance and decrease the RED investment cost without the need for additional infrastructure: assisted RED (ARED). In ARED, a small potential difference is applied in the direction of the natural salinity gradient, increasing the ionic transport rate and rapidly decreasing the initial diluate resistance. This decreasing resistance is shown to outweigh any negative effects caused by, for example, concentration polarization, resulting in a process that is more efficient than theoretically expected. As this effect is mainly important at low diluate concentrations (up to 0.1 M), ARED is proposed as a first step in an economic and energy efficient (A)RED-RO hybrid process.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors