The search for water treatments technologies with a low energy demand have led to explore the application of electrochemical energy storage devices for desalination and pollutants removal. In this sense, the technology named capacitive deionization (CDI), has been inspired by the electrochemical double layer supercapacitors field as a mean of reducing the energy consumption of the brackish water desalination process. Researchers of the Electrochemical Processes Unit of IMDEA Energy Institute have recently published their research about using 3D structured electrodes prepared from graphite felts to fabricate a 9-Cell CDI Stack. The reactor was fabricated using electrodes of 300 cm2, dimensions and size that allow to technically analyze the viability of the technology to for real-world scenarios.
The research recently published in Desalination* and conducted in collaboration with the group of the professor Vincenzo Naddeo from Salerno University (Italy), analyzes the performance of the CDI Stack equipped with 3D graphite felts for brackish water desalination. The results of this evaluation pointed out the relevance of correctly adjusting operational parameters such as current density and flow rate to achieve energy consumption values of 0.5 kWhm−3 for water productions of 2-24 LMH and salt concentration reductions of 6-10 mM. Furthermore, the results stress the robustness of the CDI reactor that was tested for 700 hours of operation without showing any decline in the performance.
(*) Lado, J. J., Cartolano, V., García-Quismondo, E., García, G., Almonacid, I., Senatore, V., Naddeo, V., Palma, J., & Anderson, M. A. Performance analysis of a capacitive deionization stack for brackish water desalination. Desalination (2021), 501, 114912. https://doi.org/10.1016/j.desal.2020.114912
More information: Julio J. Lado, Postdoctoral Researcher, Electrochemical Processes Unit, firstname.lastname@example.org
Capacitive Deionization Stack equipped with 3D graphite felt electrodes.