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Jamali Keikha, Ahmad; Behzadmehr, Amin; Ebrahimi, Abouzar; Kaykhaii, Massoud; Fanaei Sheikholeslami, Tahereh
Desalination and water treatment, April 2024, Letnik: 318Journal Article
Freshwater resources are limited; thus, different technologies for desalination of brackish and seawater have been developed. Capacitive deionization (CDI) is one of the most promising desalination technologies owing to its low cost, simplicity, nonmoving parts, and low energy consumption. However, its energy consumption significantly increases with desalination of high-salinity water. In this regard, a good understanding of the effects of different process parameters on CDI energy consumption is crucial for further performance improvement. Therefore, the surface response methodology (RSM) was adopted to systematically study the effects of applying voltage, Stern layer capacity, volume and concentration of feed water, and volume of micropores on energy consumption and desalination time. The results showed that the Stern layer capacity and volume of micropores reduced desalination time by approximately 25% without significant changes in energy consumption. With the design of an improved electrode (improving the micropore structure for ion adsorption), the desalination time (Cycle) was reduced and a slight reduction in energy consumption was achieved. It can be claimed that any improvement in the physical (porosity) and electrical properties of the electrodes, results in an important increase in the performance of the CDI system. •A batch CDI desalination cell is simulated.•RSM is used to obtain the effects of different parameters on the cell's performance.•A validated correlation based on the RSM results is presented.•Various contours are presented to help a designer find the best configuration.•The volume of micropores and Stern layer capacity are the most important parameters.
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