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Authors
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Rosentreter, H.; Moch, M.; Schödel, D.; Jeske, M.; Oddoy, T.; Meier-Haack, J.; Shocron, A. N.; Lerch, A.
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Title
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Lab-scale experiments with a monovalent ion selective membrane capacitive deionization for nitrate removal
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Date
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23.04.2025
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Number
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0
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Abstract
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Groundwater with high nitrate concentrations requires treatment before potable use. Conventional treatment methods such as nanofiltration and reverse osmosis can be used for desalination of most solutes. In contrast, a monovalent selective membrane capacitive deionization (mMCDI) can be used for selective nitrate removal. We use a nanofiltration membrane and anion exchange membranes with an additional neutral layer (AEM-Neutral) or a polyamide layer (AEM-PA) for selective nitrate removal with mMCDI by using a solution of mixed monovalent and polyvalent ions. Monovalent ion selectivity in short-term experiments is up to 17.3 with a nanofiltration membrane, up to 1.7 for AEM-Neutral and up to 5.2 for AEM-PA, whereby the specific energy consumption and water recovery depends on cell structure, applied electric voltage, flow rate and desorption time. Selective nitrate removal with AEM-PA or AEM-Neutral at 0.8 V demonstrated a specific energy consumption of 2 Wh g−1 removed nitrate, lower than pressure-driven membrane processes.
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Publisher
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Elsevier
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Wikidata
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Citation
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Water Resources and Industry 33 (2025) 100288
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DOI
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https://doi.org/10.1016/j.wri.2025.100288
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