Oily wastewaters produced in oil factories provide various
environmental problems, because of having different pollutant compounds [1,2]. Reduction of the surface water's
oxygen and its effect on the aquatic organism strains
are among the problems [3]. Various physical, chemical
and biological methods have been used to remove such
compounds [4,5]. Cheryan and Rajagopalan show that
the conventional treatments such as gravity separation,
air flotation, coagulation are not efficient to solve this
problem, especially when the oil droplets diameters are
less than 20 μ. Fischer et al. worked on a combination
of gravity separation and a downstream microfiltration.
Sarakulski et al. proposed to treat oily wastewater by a
combination of ultrafiltration and reverse osmosis processes. However, for real wastewaters is observed a
membrane fouling or a high regeneration frequency