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The effect of electric field on the surface of nanoparticles (TiO2 & SiO2) and its application to retardation of membrane fouling

S.E. Park, D.Y. Ryu, J.W. Kwak, S.J. Park and S.W. Lee
Kyungwon University, KR

Keywords:
electric field, zeta-potential, membrane fouling, TiO2, SiO2

Abstract:
The recirculation of raw water containing 0.1 wt% SiO2 through 30 kV electrostatic device changed the zeta-potential of SiO2 by 6 mV (from -18 mV to -24 mV) as well as the increase of solution pH by 1.2[3]. The effect of electrostatic force on the membrane fouling was investigated at variable solution pHs. With the decrease of solution pH, the electrostatic device prior to UF modules effectively delayed the fouling rate of the membrane surface. Electrostatic device was also effective in dispersing colloidal particles by inducing more electrostatic repulsion. The electrostatic field was concluded to increase the electrostatic repulsion between colloidal particles and the membrane surface, consequently leading to the retardation of membrane fouling.

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