“…The produced oily wastewater with an oil concentration of about 300-500 mg L-1 should be gathered and taken to a wastewater chemical plant to be disposed of and treated properly according to environmental standards and regulations. Several methods are applied to remove or decompose oil from oily water, such as biological treatment [103], photo-degradation [110], Fenton and photo-Fenton processes [100], flocculation [118], chemical coagulation [98], precoat filtration [105], ultrafiltration [113], reverse osmosis [109] and electrochemical methods. Electrochemical methods such as direct or indirect anodic oxidation [101,106,111,117], electro-Fenton [116] and electrocoagulation [102,114] have been attracting great attention for the last decades in treating various types of wastewater, as they are easily operated, require relatively low investment cost and are amenable to automation [116].…”