Experimental investigation of combined heat and power capacitive deionization
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Capacitive Deionization (CDI) is a novel separation-based technology for desalinating brackish water. By applying an electrical voltage difference, the salt ions are removed from water and temporarily stored in the porous carbon electrodes. Once the adsorption capacity is reached, the ions are released to regenerate the electrodes as reducing or reversing the electrical polarization. CDI is a promising alternative to the state-of-the-art desalination methods due to low energy consumption and economic cost. For improving desalination performance, the ion exchange membranes can be included to construct a membrane capacitive deionization (MCDI) cell. The primary aim in this thesis is to evaluate CDI from a thermodynamic and experimental perspective and to investigate the operational conditions which may improve desalination performance and energy efficiency. Based on the theoretical modeling and experiment investigations, a heat-combined MCDI system which actively harvests waste heat is explored as a medium to improve deionization cycle efficiency. In addition, the thermal and salinity effects on CDI systems are addressed based on the electrochemical characterization and salt removal performance.