FACTORS AND MECHANISM AFFECTING THE OIL REMOVAL EFFICIENCY FROM SLUDGE BY ULTRASONIC METHOD

Abstract

Abstract: The ultrasonic oil removal technology is green and environmental friendly, butthe oil removal efficiency is not high, the mechanism is not clear, andhas not been widely applied in industryincurrently. A set of ultrasonic oil removal test equipment was designed for high oil bearing drilling cuttings and sludge in a certain oilfield in the South. Seven main influencing factors, such as ultrasonic frequency, ultrasonicpower, and ultrasonic temperature,etc., were investigated on the oil removal effect. The results showed that ultrasound frequency, ultrasound power, ultrasound action time, solid-liquid ratio (oil based drilling cuttings to water mass ratio), and pH, had a significant impact on the oil sludge removal effect, while ultrasound temperature and thetimeofultrasound treatment hadlittle effecton oil removal. Under the optimal process conditions, the oil removal rate reached 57.18%. When the shear force produced by ultrasonic cavitation is greater than the interaction force between oil and solid particles, the oiladsorbed on the surface of the solid particles is desorbed.Withthe increaseoftemperature and the decrease of solid-liquid ratio, the viscosity of the oil sludge decreased, and the ultrasonic cavitation enhanced. HSiO₃^- occupies the adsorption sites of oil sludge particles in weak alkaline environments, which can prevent the readsorption of oil and improve the oil removal efficiency.

Key words: oil sludge, ultrasonic, oil removal effect, demulsification mechanism

References

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