Oil recovery from petroleum sludge through ultrasonic assisted solvent extraction.
The effect of ultrasonic assisted extraction (UAE) process on oil recovery from refinery oily sludge was examined in this study. Two types of UAE treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil and solvent recovery was investigated using an orthogonal experimental design. Results indicated that solvent type, solvent-to-sludge (S/S) ratio, and treatment duration could have significant effects on oil recovery in UAE treatment. Under the optimum conditions, UAEP treatment can obtain an oil recovery of 68.8% within 20 s, which was higher than that (i.e., 62.0%) by MSE treatment after 60 min' extraction. UAEB treatment can also obtain a promising oil recovery within shorter extraction duration (i.e., 15 min) than MSE. UAE was thus illustrated as an effective and improved approach for oily sludge recycling.
a Environmental Engineering Program, University of Northern British Columbia (UNBC) , Prince George , British Columbia , Canada.
Guangji
G
Hu
a Environmental Engineering Program, University of Northern British Columbia (UNBC) , Prince George , British Columbia , Canada.|b WZU-UNBC Joint Research Institute of Ecology and Environment, Wenzhou University (WZU) , Wenzhou , Zhejiang Province , P. R. China.
Jianbing
J
Li
c Environmental and Public Health College, Wenzhou Medical University , Wenzhou , Zhejiang Province , P. R. China.
Shuhui
S
Huang
b WZU-UNBC Joint Research Institute of Ecology and Environment, Wenzhou University (WZU) , Wenzhou , Zhejiang Province , P. R. China.
Yubao
Y
Li
D019652:Extraction and Processing Industry / Q000379:methods*; D007220:Industrial Waste / Q000032:analysis; D008962:Models, Theoretical; D010578:Petroleum / Q000032:analysis*; D059027:Recycling; D012722:Sewage / Q000737:chemistry*; D012997:Solvents; D014465:Ultrasonics
D007220:Industrial Waste; D010578:Petroleum; D012722:Sewage; D012997:Solvents
Mechanical shaking extraction (MSE); oil recovery; oily sludge; total petroleum hydrocarbon (TPH); ultrasonic assisted extraction (UAE)