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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

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Received: 7 April 2013; in revised form: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Nakamura, K.; Matsumoto, K. Separation Properties of Wastewater Containing O/W Emulsion Using Ceramic Microfiltration/Ultrafiltration (MF/UF) Membranes. Membranes 2013, 3, 87-97.

AMA Style

Nakamura K, Matsumoto K. Separation Properties of Wastewater Containing O/W Emulsion Using Ceramic Microfiltration/Ultrafiltration (MF/UF) Membranes. Membranes. 2013; 3(2):87-97.

Chicago/Turabian Style

Nakamura, Kazuho; Matsumoto, Kanji. 2013. "Separation Properties of Wastewater Containing O/W Emulsion Using Ceramic Microfiltration/Ultrafiltration (MF/UF) Membranes." Membranes 3, no. 2: 87-97.


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