A comparative study on the efficiency of polar and non-polar solvents in oil sludge recovery using solvent extraction

Nezhdbahadori, Farzad; Abdoli, Mohammad Ali; Baghdadi, Majid; Ghazban, Fereydoun

doi:10.1007/s10661-018-6748-6

Cited by 38 publications

(24 citation statements)

References 20 publications

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“…Also, cyclohexane had high ORR values at 2:1 C/OS ratio with Triton X-114 (63% ± 3) and rhamnolipid (63% ± 2). These values are higher compared to other studies (Biceroglu 1994;Avila-Chavez et al 2007;Zubaidy and Abouelnasr 2010;Hu et al 2015;Hu et al 2017;Nezhdbahadori et al 2018). These authors reported ORR values lower than 60%.…”

Section: Resultscontrasting

confidence: 64%

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Ramírez

Shaw

Collins

2020

Environ Sci Pollut Res

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Different physicochemical and biological treatments have been used to treat oil sludges, and oil recovery techniques are preferred such as oil sludge washing (OSW) with surfactants and co-solvents. Toluene is commonly used as co-solvent, but it is non-benign to the environment. This study tested alternative co-solvents (n-pentane, n-hexane, cyclohexane, and isooctane) at 1:1 and 2:1 C/OS (co-solvent to oil sludge ratio). Also, this study evaluated the effect on the oil recovery rate (ORR) of three main parameters in the washing: type, concentration, and application ratio (S/OS) of surfactants to oil sludges. To date, no study has assessed these parameters in the washing of oil sludges from different sources. Four types of oil sludges and five surfactants (Triton X-100 and X-114, Tween 80, sodium dodecyl sulphate (SDS), and rhamnolipid) were used. The results showed that cyclohexane had high ORR and could be used instead of toluene because it is more benign to the environment. The S/OS ratio had a high effect on the ORR and depended on the type of oil sludge. Rhamnolipid, Triton X-100, and Triton X-114 had the highest oil recovery rates (40 – 70%). In addition, it was found that the surfactant concentration had no effect on the ORR. Consequently, the addition of surfactant was not significantly different compared to the washing with no surfactants, except for one sludge. The use of the surfactant in the washing solution can help in the selective extraction of specific oil hydrocarbon fractions in the recovered oil to assess its potential reuse as fuel. Further recommendations were given to improve the OSW process.

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Section: Resultscontrasting

confidence: 64%

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Ramírez

Shaw

Collins

2020

Environ Sci Pollut Res

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“…High equipment cost, complicated operation and non-continuous operation have become the main obstacles hindering the development of this method. On the other hand, oil recovered directly cannot be used directly, and further refining is still needed, which increases the processing cost and cycle [68,69].…”

Section: Technical Advantages Of Oily Sludge Pyrolysismentioning

confidence: 99%

Application and development of pyrolysis technology in petroleum oily sludge treatment

Wang

Gong

Wang

et al. 2020

Environmental Engineering Research

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With the enhancement of public awareness of environmental protection, the harm of oily sludge has gradually been paid attention to. As a kind of dangerous solid waste, the arbitrary disposal of oily sludge will cause quite serious harm to both the environment and human beings. Research on the treatment methods of oily sludge has become a hot spot recently. At present, treatment methods of oily sludge are various, mainly including pyrolysis, direct combustion, freeze-thaw treatment, biological treatment, solvent extraction, thermochemical cleaning, ultrasound-assisted treatment or joint technology, etc. Based on the consideration of economic benefits, social benefits and treatment difficulties, pyrolysis has been considered to be the most appropriate method for oily sludge treatment. Syngas, liquid oil and char can be obtained from pyrolysis of oily sludge, which can meet different needs. In this paper, the pyrolysis technology of oily sludge is reported in detail, including pyrolysis methods, operational parameters and pyrolysis products of oily sludge. On the basis, the advantages and limitations of oily sludge pyrolysis technology are discussed, together with the report of feasibility of pyrolysis technology of oily sludge. Moreover, the development trend of pyrolysis technology of oily sludge is prospected for the future work.

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“…The strategies to treat these wastes are based on contaminant reduction or oil recovery techniques. Following the current waste management trends that indicate the importance of waste reduction, reuse and recycle (Sakai et al 2011;European Parliament 2008), the treatment of oil sludges has been recently aimed at oil recovery techniques (Gumerov et al 2017;Nezhdbahadori et al 2018). Therefore, oil sludge washing (OSW) with surfactants has been applied to treat the oil sludges as an oil recovery method (Zhang et al 2012;Liang et al 2017;Duan et al 2018;Liu et al 2018a), and co-solvents can be added to enhance the extraction of the oil (Hwa et al 2016;Kuppusamy et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicity of oil sludges and residuals from their washing with surfactants: soil dehydrogenase and ryegrass germination tests

Ramírez

Shaw

Collins

2020

Environ Sci Pollut Res

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Oil sludge washing (OSW) with surfactants and co-solvents is used to recover the oil, and this process leaves some residuals (sediments and surfactant solution). Currently, there are no data on the ecotoxicological effects of these OSW residuals from different sludges. This study evaluated the toxicity of OSW residuals from washing four types of oil sludges with five surfactants (Triton X-100 and X-114, Tween 80, sodium dodecyl sulphate (SDS) and rhamnolipid) and a co-solvent (cyclohexane). The toxicity of the residuals was evaluated with the impact on the soil microbial dehydrogenase activity (DHA) and ryegrass (Lolium perenne) seed germination. There was a high DHA detected directly in the sludges and all OSW residual combinations, but this activity could not be attributed to the DHA itself but to some chemical interferences. The DHA was then tested in the soils amended with the OSW residuals to simulate a bioremediation scenario. There were no chemical interferences in this case. In general, the INTF concentrations were significantly higher at low concentrations, 1 and 5% (p < 0.01). There were no significant differences in the DHA at high concentrations of OSW residuals (10, 25 and 50%) which implied that the concentration of the contaminants is not directly proportional to the levels of ecotoxicity. Unexpectedly, the INTF values of the 10, 25 and 50% rhamnolipid-OSW residuals were significantly lower than the Triton X-100 residuals. The ryegrass germination rates were higher than 70% with no apparent phytotoxicity symptoms in the seedlings. Particularly, there was a highly significant negative effect of the residuals on the germination rates at high concentrations (p < 0.01). Given that the extractable petroleum hydrocarbon (EPH) concentrations in the OSW residual-amended soils in both DHA and germination tests were very low (13–21 ppm), other co-contaminants could be contributing to the toxicity. These findings implied that biotreatment techniques can be applied to treat the OSW residuals if necessary.

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A comparative study on the efficiency of polar and non-polar solvents in oil sludge recovery using solvent extraction

Cited by 38 publications

References 20 publications

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Oil sludge washing with surfactants and co-solvents: oil recovery from different types of oil sludges

Application and development of pyrolysis technology in petroleum oily sludge treatment

Ecotoxicity of oil sludges and residuals from their washing with surfactants: soil dehydrogenase and ryegrass germination tests

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