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Titre du document / Document title

Seawater desalination and salt production in a hybrid membrane-thermal process

Auteur(s) / Author(s)

TUREK Marian (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Silesian University of Technology, Faculty of Chemistry, Institute of Chemistry, Inorganic Technology and Electrochemistry, ul. B. Krzywoustego 6, 44-100 Gliwice, POLOGNE

Résumé / Abstract

Several hybrid systems, which are developed now, namely NF-MSF, NF-RO-MSF, NF-RO-MD and others offer promising performance. An integrated system for complete usage of components in seawater is also being considered. In all the aforementioned systems NF as water pre-treatment method is applied and a considerable decrease in scale forming components is achieved. Higher recovery may be then reached when desalting in comparison to traditionally treated water. Very compact NF membranes are applied which results in a very high rejection of divalent ions and relatively high rejection of sodium chloride. A simultaneous decrease of NaCl concentration in NF process is then obtained which causes an increase in the RO recovery since the osmotic pressure value ofNF permeate is diminished. If NF-MSF (orNF followed by any thermal method) system is considered a NaCl concentration decrease in the pre-treatment is however not essential for the NF step. The salt concentration influence on thermal method performance is very weak in comparison to RO. Furthermore the highly concentrated MSF brine might be used as a possible byproduct, e.g. for obtaining salt. A dual-purpose desalination-salt production system may be then suggested. Two arrangements are presented, namely: UF-NF-MSF-crystallisation and UF-NF-RO-MSF-crystallisation systems. The high rate of water recovery is accompanied by salt obtainment in these systems. If $30/ton of salt is assumed the water cost is equal to $0.71/m3 in UF-NF-MSF-crystallisation system and $0.43/m3 in UF-NF-RO-MSF-crystallisation system. The above data demonstrate that these water costs are competitive compared to those of potable water produced in thermal or RO seawater plants.

Revue / Journal Title

Desalination    ISSN  0011-9164   CODEN DSLNAH 

Source / Source

Congrès
EuroMed 2002, Sharm El Sheikh, Sinai , EGYPTE (04/05/2002)
2003, vol. 153, no 1-3 (422 p.)  [Document : 5 p.] (13 ref.), pp. 173-177 [5 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1966) (Revue)

Mots-clés anglais / English Keywords

Production

;

Salt

;

Seawater

;

Thermal separation

;

Membrane separation

;

Desalination

;

Water treatment

;

Mots-clés français / French Keywords

Production

;

Sel

;

Eau mer

;

Séparation thermique

;

Séparation par membrane

;

Dessalement

;

Traitement eau

;

Mots-clés espagnols / Spanish Keywords

Producción

;

Sal

;

Agua mar

;

Separación térmica

;

Separación por membrana

;

Desaladura

;

Tratamiento agua

;

Localisation / Location

INIST-CNRS, Cote INIST : 12906, 35400010716182.0220

Nº notice refdoc (ud4) : 14425049



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