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Thermodynamic modeling of a combined photo-electrodialysis-chloralkali system for sustainable desalination

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submitted on 2023-10-03, 06:30 and posted on 2023-10-03, 07:02 authored by Namra Mir, Yusuf Bicer

In this paper, a thermodynamic model of a combined photo-electrodialysis-chloralkali system for desalination is developed. The waste stream from an electrodialysis unit is sent to a chloralkali reactor, which produces several useful commodities namely; H2, Cl2, and NaOH. Photoactive materials BiVO4 and Cu2O are utilized as photo-electrode coatings for the electrodialysis and chloralkali units, respectively. Photovoltaic panels are also used to provide the required electricity for the electrochemical processes. A sensitivity analysis is performed to find the effects of changing the salinity, temperature, flow rate, and recovery rate on the system performances. The feed salinity is ranged from 10 to 35 g/kg and the freshwater capacity is ranged from 35 to 350 m3/day in the system. The specific energy requirements for the electrodialysis and chloralkali units are found to be 1.225 kWh/m3 of freshwater produced and 2.5 kWh/kg Cl2 produced respectively for a salt rejection rate of 0.96 and a recovery rate of 0.77. Furthermore, the energy efficiencies for the photo-assisted electrodialysis (PED) and photo-assisted chloralkali (PCA) units are found to be 42.56% and 48.04%, respectively. Finally, the overall combined system energy and exergy efficiencies are found to be 23.93% and 33.14%, respectively.

Other Information

Published in: Desalination
License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: https://dx.doi.org/10.1016/j.desal.2020.114822

Funding

Open Access funding provided by the Qatar National Library

History

Language

  • English

Publisher

Elsevier BV

Publication Year

  • 2021

License statement

This Item is licensed under the Creative Commons Attribution 4.0 International License

Institution affiliated with

  • Hamad Bin Khalifa University
  • College of Science and Engineering - HBKU

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