关键词: 超声波-破乳联用技术, 落地油泥, 显微镜, 空化作用

Abstract: Ultrasonic-demulsification hyphenated technique was adopted to remove waste oil from oil sludge which were generated in Daqing. The effects of ultrasonic frequency, ultrasonic power, ultrasonic temperature, ultrasonic time and demulsifier dosage on the oil removal efficiency were studied. The microscopic structure of the sludge before and after ultrasonic-demulsification were analyzed by microscopy. The experimental results show that the best oil removal rate of oily sludge is 96.8% under the optimum condition of ultrasonic frequency of 40kHz, ultrasonic power of 70W, ultrasonic temperature of 40℃,ultrasonic time of 10min, and the demulsifier dosage is 3mg/L,which are 9.4% higher than a single demulsification technique. Microscopic results show that:compared with a single demulsification treatment of sludge, after ultrasonic-demulsification treatment of sludge, no obvious oil droplets and water droplets, the surface is relatively smooth and less impurity content. It is shown that the cavitation effect of ultrasonic wave has the effect of increasing the oil removal efficiency. It is proved that the ultrasonic-demulsification hyphenated technique can effectively remove waste oil sludge.

Key words: ultrasonic-demulsification hyphenated techniques, oil sludge, microscope, cavitation