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A polyethersulfone (PES) electrospun nanofiber mat was evaluated as a membrane for liquid filtration. To alleviate difficult handling of the nanofibrous web and also to provide mechanical strength a poly(ethylene terephthalate) (PET) non-woven was used as the sub-layer. The PES/PET electrospun nanofibrous membranes (ENMs) were characterized in terms of water flux and retention performance. The water flux measurements indicated that the membranes possess a high initial flux. Upon increase of the feed pressure the porosity of the ENFs is deformed resulting in drastically decreased fluxes. To enhance the interfacial stability a heat treatment was performed. Heat treatment approach in addition to enhancement of interfacial stability could preserve the structure of the nanofibrous layer and its effective porosity. Retention tests with polystyrene suspension demonstrated that the filtration performance of the ENMs …