Transfer of monovalent anions and nitrates especially through nanofiltration membranes in brackish water conditions

• Published in: Separation and purification technology Vol. 40; no. 3; pp. 237 - 242
• Main Authors: Paugam, L., Diawara, C.K., Schlumpf, J.P., Jaouen, P., Quéméneur, F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-12-2004; Elsevier Science
• Subjects: Applied sciences; Brackish waters; Chemical engineering; Exact sciences and technology; Membrane separation (reverse osmosis, dialysis...); Monovalent anions; Nanofiltration; Nitrate; Transfer mechanism; Nanofiltration; Nitrate; Transfer mechanism; Monovalent anions; Brackish waters; Charge density; Transport process; Membrane separation; Hydration; Size effect; Electrostatic interaction; Brackish water; Retention
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2004.02.012

In this paper, the transport mechanism of monovalent anions, fluorides, chlorides and nitrates particularly, through three commercial nanofiltration membranes is studied. By increasing the complexity of the solution to be treated, we underline the influence of hydration and electrostatic interactions on ions retention. Depending on membrane and on its charge density, these influences will be more or less pronounced. In brackish water conditions, the shielding of membrane charge is higher than in fresh water, which lies to a weaker Donnan exclusion and a greater influence of size effect.