Nanofiltration of seawater: fractionation of mono- and multi-valent cations

Citation
Co. Anne et al., Nanofiltration of seawater: fractionation of mono- and multi-valent cations, DESALINATN, 140(1), 2001, pp. 67-77
Citations number
13
Categorie Soggetti
Chemical Engineering
Journal title
DESALINATION
ISSN journal
00119164 → ACNP
Volume
140
Issue
1
Year of publication
2001
Pages
67 - 77
Database
ISI
SICI code
0011-9164(20011020)140:1<67:NOSFOM>2.0.ZU;2-2
Abstract
First the capabilities of six nanofiltration membranes (cut-offs of between 100 to 1000 daltons) to selectively ;demineralize salt water containing th e same cations as seawater (monovalent: Ne, K; divalent: Ca2+, Mg2+) were a ssessed and compared. The AFC-30 membrane displaying monovalent cation reje ction rates of about 50% and divalent cations rejection rates higher than 9 0% was chosen for the second part of the study dealing with seawater. The s econd part shows that water with the desired overall cation content and des ired monovalent over divalent cation ratio can be obtained from raw seawate r, without using foreign water, through a series of processes: (1) diafiltr ation, using osmosed seawater as washing solution, with a diavolumes number of 3; (2) concentration, with a volume reduction factor of 1.5; and (3) li ght final dilution of the aforementioned osmosed water. Potential applicati ons of the selectively demineralized. water are in the field of health (pre paration of nasal sprays, medical dietetics, etc.).