Effect of an AC perturbation on a desalination electrodialysis process

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The influence of an alternating (AC) sinusoidal perturbation, of known frequency and small amplitude, superimposed to the usual applied continuous (DC) signal in a desalination electrodialysis process has been studied. The experiments were carried out with two types of ion-exchange membranes and sodium chloride aqueous solutions of two initial concentrations and at different frequencies of the AC signal. The results show that the presence of the AC perturbation favours the desalination process, mainly at the lowest frequencies. This fact is considered as a consequence of that the electroosmotic transport accompanying ion transfer during the process is affected by the AC perturbation. This behaviour suggests that the presence of an AC perturbation may influence on the efficacy of the desalination process.
© 2002 Elsevier Science B.V. Financial support from the University Complutense of Madrid under Project No. PR49/98- 7756 is gratefully acknowledged.
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[1] Y. Tanaka and M. Seno, J. Chem. Faraday Trans., 1 (1986) 2065-2077. [2] Y. Tanaka, J. Membr. Sci., 57 (1991) 217-235. [3] M. Tang, G. Pourcelly, F. Lebon and C. Gavach, J. Electroanal. Chem., 336 (1992) 171-194. [4] K.L. Gering and J.F. Scamehorn, Separation Science and Technology, 23 (1988) 2231-2267. [5] M. Boude-Dumy, A. Lindheimer and C. Gavach, J. Membr. Sci., 57 (1991) 57-68. [6] R. Audinus, A. Nassr-Allah, J.R. Alvarez, J.L. Andres and R. Alvarez, J. Membr. Sci., 76 0993) 147-156. [7] I. Tugas, G. Pourcelly and C. Gavach, J. Membr. Sci., 85 (1993) 183-194. [8] M. Tasaka, S. Tamura, N. Takemura and N. Morimoto, J. Membr. Sci., 12 (1982) 169-182. [9] C. Ruiz Bauzá and V.M. Barragán Garcia, In: T.S. Serensen, (ed.), Surface Chemistry and Electrochemistry of Membranes, Marcel Dekker, New York. 1999, pp. 511-541. [10] V.M. Barragán and C. Ruiz-Bauzá, J. Colloid Interface Sci., 230 (2000) 359-366. [11] V.M.M. Lobo, Electrolyte solutions, In: Literature data on thermodynamics and transport properties. Coimbra Editora, Coimbra, 1975. [12] R.C. Weast, (ed.), Handbook of Chemistry and Physics, 55th ed., CRC Press, Inc., Cleveland, 1974. [13] J.A. Ibañez Mengual, L.M. Bereft Amorós and R. Valerdi Pérez, Desalación por membranas, DM, Murcia, 1997, [14] V.M. Barragán and C. Ruiz-Bauzá, J. Colloid Interface Sci., 195 (1997) 114-120