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Mathematical modelling and zeta potential determination in the membrane separation process

D. E. PASCU1, A. R. MIRON1, M. TOTU2, A. C. NECHIFOR1, E. EFTIMIE TOTU1,*

Affiliation

  1. Faculty of Applied Chemistry and Materials Sciences, Politehnica University of Bucharest, Gheorghe Polizu Street, No.1-7, Bucharest, 011061, Romania
  2. Faculty of Mechanical Engineering and Mechatronics, Politehnica University of Bucharest, Splaiul Independentei 313, sector 6, Bucharest, 060042, Romania

Abstract

Zeta potential is considered an important and reliable indicator of the membrane’s surface, and it is essential for the design and operation of membrane processes. In this work, we studied the effect of zeta potential on removing nitrite and sulphite anions from drinking water [1-2]. As zeta potential is sensitive to small chemical changes occurring at surface, it is suitable for monitoring membrane performance. Because, a direct measurement for it is not possible, zeta potential is establish on experimental basis by help of mathematical model [3-4]. The electroosmotic flow is generated by an electrical field able to displace the charged liquid phase within the double layer. Taking into consideration the separation abilities of the composite membranes, they could be an alternative method for the transport and removal of nitrite and sulphites anions from drinking water that could be achieved by electrokinetic effects generated by the anions from aqueous solutions subjected to an electrical field. The aqueous solution containing these anions is pumped through a microchannel whose lateral surfaces are under the direct action of electrical field acting on solution’s anions. For microchannel design and chemical species behavior inside it, COMSOL Multiphysics simulation was applied..

Keywords

Zeta potential, Nitrite, Sulphite, COMSOL Multiphysics programme.

Submitted at: April 15, 2015
Accepted at: June 24, 2015

Citation

D. E. PASCU, A. R. MIRON, M. TOTU, A. C. NECHIFOR, E. EFTIMIE TOTU, Mathematical modelling and zeta potential determination in the membrane separation process, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 1161-1167 (2015)