COMPACT ACCELERATED PRECIPITATION SOFTENING (CAPS) AS A PRETREATMENT FOR MEMBRANE DESALINATION .1. SOFTENING BY NAOH

Authors
KEDEM O ZALMON G
Citation
O. Kedem et G. Zalmon, COMPACT ACCELERATED PRECIPITATION SOFTENING (CAPS) AS A PRETREATMENT FOR MEMBRANE DESALINATION .1. SOFTENING BY NAOH, Desalination, 113(1), 1997, pp. 65-71
Citations number
12
Categorie Soggetti
Water Resources","Engineering, Chemical
Journal title
Desalination → ACNP
ISSN journal
00119164
Volume
113
Issue
1
Year of publication
1997
Pages
65 - 71
Database
ISI
SICI code
0011-9164(1997)113:1<65:CAPS(A>2.0.ZU;2-Q
Abstract
This study examines the application of compact accelerated precipitati on softening (CAPS)-a previously developed process-as a pretreatment f or membrane desalination. In this CAPS process, rapid precipitation of calcium carbonate is achieved by cake filtration. The importance of t his pretreatment step lies in the fact that softening (by NaOH in this case) facilitates an increase of the recovery ratio in membrane desal ination by decreasing the potential for scaling. In addition, CAPS ser ves as an effective filtration step, reducing both turbidity and the s ilt density index and hence the potential for membrane fouling.