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- W2908577003 endingPage "114" @default.
- W2908577003 startingPage "100" @default.
- W2908577003 abstract "Capacitive deionization (CDI), which is based on the electrosorption of ions by porous electrodes, is an emerging technology for brackish water desalination. Understanding the key drivers of energy consumption in CDI and benchmarking CDI with reverse osmosis (RO), the current state-of-the-art for brackish and seawater desalination, is crucial to guide the future development of desalination technologies. In this study, we develop system-scale models to analyze the energy consumption and energy efficiency of CDI and RO over a wide range of material properties and operating conditions. Using our models, we explore how the energetic performance of CDI and RO compare as a function of feed salinity, water recovery, salt rejection, and average water flux, which is normalized by electrode and membrane area in CDI and RO, respectively. Our analysis shows that RO is significantly more energy efficient than CDI, particularly when targeting higher salinity feed streams and higher salt rejection values. For brackish water with a salt concentration of 2000 mg L−1, achieving 50% water recovery and 75% salt rejection, with an average water flux of 10 L m−2 h−1 using CDI requires a specific energy consumption of 0.85 kWh m−3, more than eight times that of RO (0.09 kWh m−3). Importantly, our results also indicate that current efforts to improve electrode materials can only marginally reduce the energy consumption of CDI. We conclude with a discussion highlighting other important factors, such as capital cost, electrode stability, and membrane fouling, which affect the efficacy of CDI and RO for low-salinity desalination." @default.
- W2908577003 created "2019-01-25" @default.
- W2908577003 creator A5035588847 @default.
- W2908577003 creator A5045926381 @default.
- W2908577003 creator A5060877886 @default.
- W2908577003 creator A5068569670 @default.
- W2908577003 creator A5084408948 @default.
- W2908577003 creator A5085899212 @default.
- W2908577003 creator A5090975442 @default.
- W2908577003 date "2019-04-01" @default.
- W2908577003 modified "2023-10-18" @default.
- W2908577003 title "Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis" @default.
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