Hybrid nanofiltration–electrodialysis system efficiency in nitrate removal: optimization by RSM and validation

This study enhances nitrate recovery from groundwater using a hybrid membrane process, combining electrodialysis (ED) and nanofiltration (NF) with response surface methodology (RSM). Employing the Box–Behnken design (BBD), the research explored key operational factors affecting nitrate removal. A qu...

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Bibliographic Details
Published in:Water quality research journal 2024-12
Main Authors: Elazhar, Fatima, Mamadou Diallo, Haby, Elazhar, Maryem, Elmrabet, Hanane, Taky, Mohamed, Elmidaoui, Azzeddine
Format: Article
Language:English
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Summary:This study enhances nitrate recovery from groundwater using a hybrid membrane process, combining electrodialysis (ED) and nanofiltration (NF) with response surface methodology (RSM). Employing the Box–Behnken design (BBD), the research explored key operational factors affecting nitrate removal. A quadratic model demonstrated strong predictive accuracy, with an R2 close to 1 and errors below 5% for responses such as nitrate content, specific energy consumption (SEC), and water recovery (Y%). While a single NF system achieved less than 60% nitrate removal, combining it with ED resulted in a total nitrate removal rate of up to 91%, a recovery rate of 75.25%, a lower SEC of 1.25 kWh/m³, and a nitrate level of 46.10 mg/L, producing water that meets drinking water standards, but which is slightly corrosive yet non-scaling.
ISSN:2709-8044
2709-8052
DOI:10.2166/wqrj.2024.043