Effect of ozone on microfiltration as a pretreatment of seawater reverse osmosis

Abstract The main purpose of this study is to evaluate a combined ozone and microfiltration (MF) membrane process as pre-treatment of a seawater reverse osmosis (SWRO) system. During the filtration of seawater (SW) with the MF membranes, membrane fouling on both hydrophilic (PHI) and hydrophobic (PHO) MF membranes (PVDF, 0.22 μm pore size) was investigated by measuring the variation of flux. A significant decline of flux was observed in both PHI and PHO membranes, showing much higher fouling in the PHO membrane than the PHI membrane, with and without pre-filtration. Ozonation of the SW was performed to investigate the effect of ozone on fouling of the MF membrane. Reduction of membrane fouling by ozone occurred in only the PHO membrane. In the case of the PHI membrane, pre-ozonation of the SW led to more severe fouling during filtration than was the case for non-ozonated SW.

[1]  Munir Cheryan,et al.  Ultrafiltration and Microfiltration Handbook , 1998 .

[2]  U. Gunten,et al.  Bromate formation in advanced oxidation processes , 1996 .

[3]  W. Bae,et al.  Effect of intermittent back ozonation for membrane fouling reduction in microfiltration using a metal membrane , 2002 .

[4]  J. Hoigne,et al.  Determination of ozone in water by the indigo method , 1981 .

[5]  David A. Reckhow,et al.  Ozone in Water Treatment , 1991 .

[6]  K. Buchan,et al.  Measurement of dissolved ozone in sea water: A comparison of methods , 2005 .

[7]  Joon-Wun Kang,et al.  Microfiltration of MS2 bacteriophage: Effect of ozone on membrane fouling , 2007 .

[8]  Y. Mori,et al.  Ozone-microfiltration system , 1998 .

[9]  Bruce Durham,et al.  Membrane pretreatment of reverse osmosis — Long term experience on difficult waters , 1997 .

[10]  Christopher Bellona,et al.  Effect of membrane fouling on transport of organic contaminants in NF/RO membrane applications , 2006 .

[11]  M. Elimelech,et al.  Biofouling of reverse osmosis membranes: Role of biofilm-enhanced osmotic pressure , 2007 .

[12]  G. White.  The Handbook of Chlorination and Alternative Disinfectants , 1992 .

[13]  Menachem Elimelech,et al.  Influence of Crossflow Membrane Filter Geometry and Shear Rate on Colloidal Fouling in Reverse Osmosis and Nanofiltration Separations , 2002 .

[14]  H. Chmiel,et al.  Study of a hybrid process combining ozonation and membrane filtration — filtration of model solutions , 2003 .

[15]  S. Ebrahim,et al.  Microfiltration system as a pretreatment for RO units: Technical and economic assessment , 1997 .

[16]  Manish Kumar,et al.  Investigation of seawater reverse osmosis fouling and its relationship to pretreatment type. , 2006, Environmental science & technology.

[17]  Joon-Wun Kang,et al.  Role of ozone for reducing fouling due to pharmaceuticals in MF (microfiltration) process , 2007 .