| Autor: |
Korchane, Sonia, Chaabane, Lobna, Dammak, Lasaad, Chérif, Mona, Salah, Abdelhamid Ben, Walha, Khaled, Kozmai, Anton |
| Předmět: |
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| Zdroj: |
Desalination & Water Treatment; Feb2017, Vol. 65, p52-59, 8p |
| Abstrakt: |
Several international reports have pointed that 2.3 billion people are living in regions with absolute water scarcity, despite the availability of a surface water source that can be treated to become drinkable. We, thus, suggest to apply a new technique, called neutralization dialysis (ND). We described this technique meant to desalinate real brackish water in previous papers. The ND is a low energy intensive technique and is easy to implement even in isolated locations. Kinetics of reconstituted and brackish waters desalination by ND were studied in a three-compartment stack (acid, saline, and alkali compartments) with Neosepta® AMX and CMX ion-exchange membranes, and the process feasibility was evaluated. Brackish water samples were taken from the city of Gabes in the south of Tunisia and analysed in different terms. The pH and the ionic conductivity kinetics were measured in the saline solution during different ND operations for five different solutions: CaCl2, Na2SO4, MgSO4, the mixture of these three salts (which are used to have, by themselves, a reconstructed water very close to the reconstituted water), and Gabes brackish water. The correlation of ion transport through the cation- and the anion-exchange membranes was investigated. This work has shown that the desalination kinetics is similar in the cases of Na2SO4 and MgSO4 solutions, while it is different in the case of CaCl2. We found out that the time dependence of pH for the reconstituted and the real waters during desalination is quasi-similar. However, the conductivity evolution for both solutions is different. The values of ion charge (monovalent/divalent) and concentration in the feed solution have an impact on the ion-exchange rate. The total cost of Gabes brackish water desalination by the ND process (stopped at conductivity of 1 mS cm–1) was estimated at 1.90 $/m3. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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