Lab-scale experiments with a monovalent ion selective membrane capacitive deionization for nitrate removal
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
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.
Details
| Original language | English |
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| Article number | 100288 |
| Number of pages | 16 |
| Journal | Water Resources and Industry |
| Volume | 33 |
| Publication status | Published - Jun 2025 |
| Peer-reviewed | Yes |
External IDs
| ORCID | /0000-0002-6355-9122/work/205331389 |
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Keywords
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- Membrane capacitive deionization, Monovalent ions, Nitrate, Partial desalination, Selectivity