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Membranes 2013, 3(2), 87-97; doi:10.3390/membranes3020087
Article

Separation Properties of Wastewater Containing O/W Emulsion Using Ceramic Microfiltration/Ultrafiltration (MF/UF) Membranes

*  and
Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai Hodogaya-ku, Yokohama 240-8501, Japan
* Author to whom correspondence should be addressed.
Received: 7 April 2013 / Revised: 6 June 2013 / Accepted: 10 June 2013 / Published: 21 June 2013
(This article belongs to the Special Issue Membranes and Water Treatment)
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Abstract

Washing systems using water soluble detergent are used in electrical and mechanical industries and the wastewater containing O/W emulsion are discharged from these systems. Membrane filtration has large potential for the efficient separation of O/W emulsion for reuses of treated water and detergent. The separation properties of O/W emulsions by cross-flow microfiltration and ultrafiltration were studied with ceramic MF and UF membranes. The effects of pore size; applied pressure; cross-flow velocity; and detergent concentration on rejection of O/W emulsion and flux were systematically studied. At the condition achieving complete separation of O/W emulsion the pressure-independent flux was observed and this flux behavior was explained by gel-polarization model. The O/W emulsion tended to permeate through the membrane at the conditions of larger pore size; higher emulsion concentration; and higher pressure. The O/W emulsion could permeate the membrane pore structure by destruction or deformation. These results imply the stability of O/W emulsion in the gel-layer formed on membrane surface play an important role in the separation properties. The O/W emulsion was concentrated by batch cross-flow concentration filtration and the flux decline during the concentration filtration was explained by the gel- polarization model.
Keywords: ultrafiltration; microfiltration; ceramic membrane; O/W emulsion; gel-polarization model ultrafiltration; microfiltration; ceramic membrane; O/W emulsion; gel-polarization model
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Nakamura, K.; Matsumoto, K. Separation Properties of Wastewater Containing O/W Emulsion Using Ceramic Microfiltration/Ultrafiltration (MF/UF) Membranes. Membranes 2013, 3, 87-97.

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