Lab-scale experiments with a monovalent ion selective membrane capacitive deionization for nitrate removal

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

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

OriginalspracheEnglisch
Aufsatznummer100288
Seitenumfang16
FachzeitschriftWater Resources and Industry
Jahrgang33
PublikationsstatusVeröffentlicht - Juni 2025
Peer-Review-StatusJa

Externe IDs

ORCID /0000-0002-6355-9122/work/205331389

Schlagworte

Ziele für nachhaltige Entwicklung

Schlagwörter

  • Membrane capacitive deionization, Monovalent ions, Nitrate, Partial desalination, Selectivity