Oil recovery from refinery oily sludge via ultrasound and freeze/thaw

The effective disposal of oily sludge generated from the petroleum industry has received increasing concerns, and oil recovery from such waste was considered as one feasible option. In this study, three different approaches for oil recovery were investigated, including ultrasonic treatment alone, fr...

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Bibliographic Details
Published in:Journal of hazardous materials 2012-02, Vol.203, p.195-203
Main Authors: Zhang, Ju, Li, Jianbing, Thring, Ronald W., Hu, Xuan, Song, Xinyuan
Format: Article
Language:English
Subjects:
biosurfactants
Crude oil
desorption
Freeze/thaw
Freezing
Hot Temperature
Hydrocarbons
industry
Oil recovery
oils
Oils - isolation & purification
Oily sludge
petroleum
Petroleum hydrocarbons (PHCs)
Rhamnolipids
Sewage
Sludge
slurries
sodium chloride
Ultrasonic treatment
Ultrasonics
Ultrasound
Waste water
wastewater
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Summary:The effective disposal of oily sludge generated from the petroleum industry has received increasing concerns, and oil recovery from such waste was considered as one feasible option. In this study, three different approaches for oil recovery were investigated, including ultrasonic treatment alone, freeze/thaw alone and combined ultrasonic and freeze/thaw treatment. The results revealed that the combined process could achieve satisfactory performance by considering the oil recovery rate and the total petroleum hydrocarbon (TPH) concentrations in the recovered oil and wastewater. The individual impacts of five different factors on the combined process were further examined, including ultrasonic power, ultrasonic treatment duration, sludge/water ratio in the slurry, as well as bio-surfactant (rhamnolipids) and salt (NaCl) concentrations. An oil recovery rate of up to 80.0% was observed with an ultrasonic power of 66 W and an ultrasonic treatment duration of 10 min when the sludge/water ratio was 1:2 without the addition of bio-surfactant and salt. The examination of individual factors revealed that the addition of low concentration of rhamnolipids (
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2011.12.016