Solid effect in chemical cleaning treatment of oily sludge

Liang, Jiling; Zhao, Lei; Hou, Wanguo

doi:10.1016/j.colsurfa.2017.02.038

Cited by 43 publications

(30 citation statements)

References 36 publications

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“…At present, the commonly used oily sludge cleaning agents are mainly divided into inorganic salt type and organic salt type. 16 Among them, organic salt surfactants can be divided into cationic surfactants, anionic surfactants, nonionic surfactants, and amphoteric surfactants according to the properties of the hydrophilic head. Due to the complex and diverse structures of surfactants, surfactants with different structures have different adsorption characteristics, critical micelle concentration values, and solubilization capabilities.…”

Section: Resultsmentioning

confidence: 99%

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

et al. 2021

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This paper reported a new oily sludge compound cleaning agent formula, which used a combination of molecular simulation and experimental methods to study its interfacial formation energy (IFE), and exciting results were obtained. From a total of 24 surfactants in five categories, sodium silicate (Na 2 SiO 3 ), sodium dodecylbenzene sulfonate, and fatty alcohol polyoxyethylene polyoxypropylene ether (JFC-SF) were screened out because of their excellent washing oil effect. Under a reasonable orthogonal system, when the mass ratio of the three surfactants was 3:1:1, the oil desorption effect was the best, the oil residual rate could reach 2.13%, and the oil removal efficiency could reach 93.53%. Verified by the molecular dynamics simulation module, the absolute value of the interface binding energy was the largest at this compound ratio, which was 465.71 kcal/mol. More importantly, we have discussed in depth the mechanism of adsorption and permeation of oily sludge by cleaning agents. Through single-factor influence experiments, the following optimized working condition parameters of the cleaning agent were determined: cleaning conditions with an agent content of 4%, a temperature of 70 °C, a stirring speed of 400 rpm, a cleaning time of 30 min, and a liquid–solid ratio (L/S) of 4:1. The research results laid the foundation for resource utilization, harmlessness, and reduction of oily sludge in the Liaohe oilfield.

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Section: Resultsmentioning

confidence: 99%

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

et al. 2021

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“…It is generally believed that the desorption of asphaltene from solid surface is the most difficult part in the treatment process of oil-contaminated soil. Based on the difference in asphaltene content between the two samples, a first-order kinetic model was used to fit the extraction process of the two samples, as shown in Figure . The dynamic parameters (such as rate constant and activation energy) of the two processes were calculated by using eqs and , as shown in Table S4: where A is the predacious factor, C t the oil content at time t , T the temperature (K), and t the reaction time.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the high content of asphaltene is the key factor that makes the sludge difficult to be treated and is also an important reason to attract many researchers or practitioners to study this kind of oil-contaminated soil. It is a new idea to recover the oil content and ensure that oil content of the tails is lower than the relevant standard, which has been favored by more and more environmental protection personnel. , Under the guidance of this treatment idea, many new methods have emerged in recent years, such as enhanced oil recovery using surfactants, , the freeze–thaw method, , pyrolysis, solvent extraction, , chemical cleaning, , flotation, microwave radiation, , electrical treatment, and centrifugation. , However, no effective method has been found for the treatment of asphaltenes.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Oil-Contaminated Soil from Kuwaiti Dry Oil Lakes: Development of a New Processing Technology

et al. 2020

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Oil-contaminated soil of a dry oil lake which was taken from Kuwait included two types of samples, namely, oil sludge and oil soil. Through the analysis of physical and chemical properties, the results show that both of them with high oil content had a certain recycling value combined with a poor dispersion effect in water. Then, a new process based on countercurrent extraction was designed to treat the oil-contaminated soil. Through a series of laboratory-scale experiments, the optimal processing conditions were found, in which the oil content of tails was lower than 0.5% and the oil obtained from the organic phase by evaporating could be reused. Furthermore, the reaction conformed to the kinetic characteristics of the quasi-first-order reaction; the activation energy (E a) was 27.425 kJ/mol (oil sludge) and 51.839 kJ/mol (oil soil), and the extraction mechanism of the compound extractant was expounded. The proposed countercurrent extraction method shows well performance to recover oil from oil-contaminated soil which is economically efficient and supports environmental protection.

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“…It has been established that the oil sludge treatment should follow the reduction, reuse, and recycle (3R) policies mentioned in the present waste management procedures (Sakai et al 2011 ; European Parliament 2008 ). Therefore, oil sludge washing (OSW) with surfactants has been used to recover the oil (Liang et al 2017 ; Duan et al 2018 ; Liu et al 2018a ; Chen et al 2019 ) and sometimes co-solvents are added to help with the oil extraction process (Zheng et al 2012 ). Hu et al ( 2020 ) mentioned that there has been recently increasing oil recovery-related research to extract valuable energy and to reduce potentially harmful petroleum hydrocarbons and volume of oil sludge to dispose of.…”

Section: Introductionmentioning

confidence: 99%

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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Solid effect in chemical cleaning treatment of oily sludge

Cited by 43 publications

References 36 publications

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

Compound Cleaning Agent for Oily Sludge from Experiments and Molecular Simulations

Treatment of Oil-Contaminated Soil from Kuwaiti Dry Oil Lakes: Development of a New Processing Technology

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

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