Abstract
In this study, a hybrid microfiltration/ultrafiltration process was employed for treatment of oily wastewaters and the effects of some operating parameters such as transmembrane pressure (TMP), cross-flow velocity and oil concentration on the separation performance were investigated. For this purpose, the cross-flow microfiltration (MF) using a polyvinylidene fluoride membrane and ultrafiltration (UF) with a polyethersulfone (PES) membrane that was fabricated by a non-solvent-induced phase inversion method were conducted in series mode. The separation performance of the hybrid process was compared with the performance of single MF and UF processes for the treatment of an industrial oily wastewater. The results showed that the permeate flux increased and the oil rejection decreased by an enhancement in both TMP and cross-flow velocity. The analysis of variance confirmed the experimental results and indicated that the individual effect of TMP and cross-flow velocity is more important than the interactional effect of these operating parameters on the permeate flux and oil rejection. The permeate of the hybrid process had better quality in terms of total organic carbon, chemical oxygen demand, total dissolved solids, total suspended solids, oil and grease content as well as turbidity compared with the treated water by single MF and UF methods.
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