College of Environment, Nanjing University of Technology, Nanjing, China.
J Hazard Mater. 2009 Nov 15;171(1-3):914-7. doi: 10.1016/j.jhazmat.2009.06.091. Epub 2009 Jun 24.
Oily sludge with an initial oil content of 0.130 g g(-1) (dry basis) was mixed with water and treated in an ultrasound cleaning tank. The oil was then separated from the oily sludge by air floatation. Experiments were carried out with and without 28 kHz ultrasonic irradiation at different temperatures. The results show that the minimum oil content, 0.055 g g(-1) (dry basis), was obtained at 40 degrees C after ultrasound irradiation, which was 55.6% less than without ultrasonic irradiation. In addition, this work clearly establishes that 28 kHz ultrasound is superior to 40 kHz ultrasound. The ultrasonic acoustic pressure amplitude with the 28kHz ultrasound was 0.085 MPa; the 28 kHz ultrasound also exhibited lower oil content than the 40 kHz ultrasound, which yielded 0.120 MPa acoustic pressure amplitude. It can also be concluded that sodium silicate obstructs ultrasound oily sludge deoiling.
初始含油率为 0.130 g g(-1)（干基）的含油污泥与水混合后在超声清洗槽中进行处理。然后通过气浮将油从含油污泥中分离出来。在不同温度下进行了有无 28 kHz 超声波辐射的实验。结果表明，超声辐射后在 40°C 时获得的最小含油率为 0.055 g g(-1)（干基），比没有超声辐射时减少了 55.6%。此外，本工作清楚地表明 28 kHz 超声波优于 40 kHz 超声波。28 kHz 超声波的超声声压幅度为 0.085 MPa；28 kHz 超声波的含油率也低于声压幅度为 0.120 MPa 的 40 kHz 超声波。还可以得出结论，硅酸钠阻碍了超声波含油污泥除油。
