The book encompasses synthesis of asymmetric polymeric mixed matrix ultrafiltration (UF) flat sheet membranes using polysulfone (PSf) polymer, N-methyl-2-pyrrolidone (NMP) solvent and various additives like bentonite, silica, polymer-grafted-bentonite for the enhancement of the antifouling properties of membranes so that the prepared membranes can be successfully employed for the removal of oil from oily wastewater, generated during oil and gas production. The book comprises of: - Characterization of silica and bentonite nanoparticles - Preparation and characterization of nanoparticle mixed matrix PSf UF membranes - Preparation and characterization of synthetic produced water (SPW) - Characterization of oilfield produced water - Testing and performance studies of silica and bentonite based mixed matrix membrane using synthetic produced water - Preparation of polymer-grafted bentonite nanoparticles - Preparation and characterization of polymer-g-bentonite based PSf UF membranes - Purification of oilfield produced water using polymer-g-bentonite based UF membranes.