Luo Xiaoming, Gong Haiyang, He Ziling, Zhang Peng, He Limin
Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum (East China), Qingdao, 266580, China.
Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum (East China), Qingdao, 266580, China.
J Hazard Mater. 2020 Nov 15;399:123137. doi: 10.1016/j.jhazmat.2020.123137. Epub 2020 Jun 11.
The acoustic parameters and operating conditions that determine efficiency of oil recovery from oily sludge are studied. Based on this, the mechanism of ultrasonic disintegration of oily sludge is analyzed. The results show that lower frequency ultrasound results in larger and more energetic cavitation bubbles that are more effective in the desorption of oil from solid particles. Moreover, acoustic intensity and treatment time that correspond to maximal oil recovery are found. Increasing the ratio of water to sludge and pH can reduce the slurry viscosity and facilitate the formation of HSiO, respectively, which improves the oil recovery efficiency. Moreover, Triton X-100 has better oil solubilizing effects than SDBS. After ultrasonic treatment, small amounts of asphaltenes are more stable on solid particles than other components. The heteroatoms such as S, N, and O in asphaltenes form hydrogen bonds with hydroxyl groups on the surface of the particles, impeding the desorption of oil. Mechanical effects such as shock waves and micro jets due to acoustic cavitation can break the hydrogen bonds between asphaltenes and solid particles, thereby facilitating oil recovery from oily sludge.
研究了决定从含油污泥中回收油效率的声学参数和操作条件。在此基础上，分析了含油污泥超声分解的机理。结果表明，较低频率的超声会产生更大、能量更高的空化气泡，这些气泡在从固体颗粒中解吸油方面更有效。此外，还找到了对应最大油回收率的声强和处理时间。增加水与污泥的比例和pH值可以分别降低浆液粘度并促进HSiO的形成，从而提高油回收效率。此外，Triton X-100比SDBS具有更好的油增溶效果。超声处理后，少量沥青质在固体颗粒上比其他成分更稳定。沥青质中的S、N和O等杂原子与颗粒表面的羟基形成氢键，阻碍油的解吸。声空化产生的冲击波和微射流等机械效应可以打破沥青质与固体颗粒之间的氢键，从而促进从含油污泥中回收油。
