“…Oil in the dissolved form can be separated by various processes such as vacuum evaporation, 29 distillation, 30 membrane reactors, 31 and biological treatments using microbes. 32 Oil in the emulsified form can be separated by various processes such as membrane separation, 33 vacuum evaporation, 34 coagulation, 35 flocculation chemical treatment, 36 flotation, 37,38 reverse osmosis/adsorption, deep bed filtration, 39 packed bed coalescence, 35,40–48 electro-flotation, 36 electrocoagulation, 49 and coalescence. 50,51 But certain issues have become impediments to traditional techniques.…”