科研之友
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摘要
Oil sludge from oilfield is one kind of hazardous wastes, and its harmless treatment is one of the major challenges faced by the oil field in our country. In order to get better understanding on the relationship between oil sludge soil properties and crude oil removal efficiency by ultrasonic irradiation, typical oil sludge samples from different oilfield were investigated. After the treatment, the residual crude oil content, solid particles diameter distribution and chemical composition of the soil were analyzed, and the results showed that the oil removal efficiency was higher than 60% for Daqing and Dagang oil sludge with the large soil particles diameter treated by ultrasonic, while the oil removal efficiency was only 11% for Jidong oil sludge with the smaller soil particles. Daqing and Dagang oil sludge had low calcium oxides contents of 4.84% and 5.94%, respectively, while Jidong oil sludge had high calcium oxides contents of 11.57%. Further simulation experiments also showed that the soil with high calcium oxides content had large adsorption capacity toward crude oil, high adsorption affinity and low oil removal efficiency by ultrasonic irradiation, while the soil with low calcium oxides content had small crude oil adsorption capacity, low adsorption affinity and good oil removal efficiency. The results from this study could provide supports for the development and large-scale application of the ultrasonic technology treating the oil sludge in the oil fields.
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