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Challenges faced in the conventional methods of separating lipids and oils from water demand new approaches to address the environmental issues relating to oily wastewater. Technologies involving membranes for the separation process stand promising to provide cutting-edge solutions in remediation due to its high efficiency, simplicity in functioning, low energy consumption and ease of scaling up. This chapter introduces readers to the principles of wetting by a liquid drop on a solid surface and its associated models, thereafter describing the phenomenon in different classes of wettable membranes. With the growing knowledge of material science and nanotechnology, advanced multidisciplinary researches on membrane separation techniques address the challenges relating to fouling of membranes, its scalability, durability, recyclability, automatization and manufacturing cost for its utilization in large scale …