The ultrafiltration (UF) of model oily wastewater containing an emulsifier was investigatedudin order to determine the main parameters affecting the flux, retention and membraneudfouling. The experiments were carried out with a laboratory UF device, using regeneratedudcellulose UF membranes. The finding that the fall in flux with time correlated best with theudcake formation model is in accordance with the result that increasing resistance during filtra-udtion is caused predominantly by the concentration polarization, while the participation ofudmembrane fouling in the total resistance is negligible. Analysis of the parameters affectingudthe UF of oily wastewater demonstrated that the flux is mainly influenced by temperatureudand concentration (besides the membrane pore size), while the concentration and the stirringudspeed are the parameters affecting the resistance. The retention increased slightly withudconcentration, but this was mainly determined by the membrane pore size.
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