Abstract: At present, in the field of oil-water separation and deep purification of oily wastewater in substation, there is no mature technology that can meet the standard discharge of oily wastewater with different concentrations and give consideration to high efficiency and economy. This paper proposes an oily wastewater treatment technology using hydraulic cavitation oil-water separation method coupled with ozone chemical technology. In the early stage, after removing most of the oil slick with hydrocyclone, the emulsified oil that is difficult to remove enters the hydraulic cavitation unit, and a small amount of floating oil and emulsified oil are oxidized into small molecular substances through the cavitation effect to be removed. At the same time, the ozone generated by the ozone generator can strengthen the oxidation reaction efficiency, improve the equipment treatment capacity and reduce the content of oil and organic matter in the subsequent effluent. By setting up an experimental platform and configuring oily wastewater with different oil content for test, the total oil content of oily wastewater can be significantly reduced to 5mg / L, which verifies the feasibility and efficiency of this technology.

Key words: accident oil pool, oily wastewater, water conservancy cavitation