Effects of Hot Water-Based Extraction Process on the Removal of Petroleum Hydrocarbons from the Oil-Contaminated Soil

Chen, Hong-Shuo; Li, Xin; Zhang, Qiming; Liu, Yangsheng

doi:10.1021/acs.energyfuels.9b04352

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Many studies have demonstrated that surfactants are promising cleaning agents, and satisfactory cleaning results can be obtained using cationic, anionic, and non-ionic surfactants; however, because of the negative charge of oily sludge particles, cationic surfactants tend to remain in the soil and have a substantial impact on the environment. Thus, anionic and non-ionic surfactants are usually used, which have been investigated to optimize the formulations of surfactants and investigate the washing and extraction effects of their single and combined use [78].…”

Section: Surfactantsmentioning

confidence: 99%

Application and Development of Chemical Heat Washing Technology in Petroleum Oily Sludge Treatment: A Review

Liu,

Wang,

Zhai

et al. 2024

Separations

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Because of the requirements for accelerating the construction of a green, low-carbon, and recycling economy development system, the petrochemical industry has been paying attention to green and low-carbon transformations and innovations. Oily sludge is a type of bulk hazardous solid waste from various sources that significantly harms the environment. Chemical heat washing of oily sludge represents a large proportion of the treatment technology for oily sludge, which can be used individually and has many applications in joint treatment with other processes. However, research on the formulation of cleaning agents for this process has mainly focused on the surfactant at this stage, and many studies have demonstrated the secondary pollution of surfactant; thus, research on reducing or replacing surfactants as cleaning agents has been conducted. This review highlights the research progress of chemical heat washing of oily sludge according to the classification of cleaning agents and describes the reasons for the stabilization of currently recognized oily sludge, the chemical heat washing process, and the mechanism of oil–soil separation. Finally, the research direction for new emulsions as new cleaning agents to replace surfactants is set out.

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Section: Surfactantsmentioning

confidence: 99%

Application and Development of Chemical Heat Washing Technology in Petroleum Oily Sludge Treatment: A Review

Liu,

Wang,

Zhai

et al. 2024

Separations

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“…31 Many studies have shown that the effects of compound cleaning agents are better than the cleaning effects of a single detergent. For example, Chen et al 32 studied the effect of compound surfactants, Tween 80, SDBS, and washing powder on the cleaning effect. The results confirmed that the cleaning effect of the composite surfactant group on the hot water leaching process of oil sludge and oily soil was significantly better than those of the other four groups.…”

Section: Compounding Of Cleaning Agentsmentioning

confidence: 99%

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Yan,

Tong,

et al. 2023

Ind. Eng. Chem. Res.

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Oily sludge is both a hazardous waste and a resource that contains significant amounts of recoverable mineral oil, while the recovery and reduction of mineral oil are the main methods of reducing the hazardous characteristics of oily sludge. In this study, chemical hot washing was used to treat oily sludge from an oilfield in Xinjiang, China, and the optimum detergent formulation and optimal process parameters were obtained through chemical compounding and process parameter optimization. The mechanism of oil removal was explored through a variety of different components of crude oil. The results show that the compound detergent AXQ (sodium phosphate/ sodium carbonate = 4:6) can reduce the oil content of oily sludge from 20.13 to 1.55% at a dosing rate of 1.5%, 70 °C, a solid−liquid ratio of 1:5, a stirring rate of 400 rpm, a stirring time of 20 min, a pH value of 9, a centrifugal speed of 3000 rpm, a centrifugal time of 10 min, and an oil removal rate of 92.30%, meeting the DB 65/T 3998-2017 treatment standard. Chemical thermal washing removed most of the mineral oil, with 93.47, 95.38, 63.35, and 79.47% removal of the four components, respectively, and gas chromatography analysis indicated that most of the low carbon number petroleum hydrocarbons prior to n-heptadecane were removed. Analysis of the different crude oil components after hot washing shows that the alkaline inorganic salts destroy the stable emulsion system formed by naturally occurring interfacially active substances like asphaltene and resin through electrical neutralization, achieving a three-phase separation of oil, water, and solids and laying the foundation for mineral oil removal.

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“…For instance, when oil sands were cleaned using water washing, the asphaltene was easily removed from the silica surface by the action of chemicals and fluid disruption. In contrast, asphaltenes on clay surfaces were difficult to remove [10]. The difference between properties of oil-silica and oil-clay interfaces is the fundamental reason for this variation [11].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Interaction of Clay and Saturates in Petroleum-Contaminated Soil: Effect of Clay Surface Heterogeneity

Yang

Liang

2022

Molecules

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Petroleum-contaminated soil (PCS) exhibits a variety of oil–soil interfacial properties. Surface heterogeneity of soil particles is one of the most critical influencing aspects. The interaction energies of the heterogeneous surfaces of montmorillonite (Mnt) and kaolinite (Kln) for saturates adsorption were determined by molecular simulation to be −1698.88 ± 0.67 (001 surface of Mnt), −73.81 ± 0.51 (010 edge of Mnt), −3086.33 ± 0.46 (001 surface of Kln), and −850.17 ± 0.74 (010 edge of Kln) kJ/mol, respectively. The adsorption of both clays with saturates relied on van der Waals forces, and the edges of Mnt were hardly adsorbed with saturates. According to adhesive force measurements, the oil–clay interaction forces of Mnt and Kln were 111.18 ± 0.01 and 122.65 ± 0.03 μN, respectively. In agreement with the simulations, Kln adsorbed saturates more strongly. Dynamic interfacial rheology and liquid viscoelasticity also revealed differences in adsorption behaviors between Mnt–saturates and Kln–saturates. It demonstrated that in the case of relatively low clay concentrations, the impact of particle surface heterogeneity on the adsorption process was stronger than that of structure even though Mnt had multilayer structures. Moreover, in thermodynamic adsorption experiments, it was evident that Kln adsorbed more oil than Mnt at the adsorption equilibrium states even though both were multilayer adsorptions and the adsorption amounts declined with increasing temperature. Simultaneously, the characteristics of the thermal adsorption of clay and saturates with different proportions were consistent with clay dispersion in saturates, and Kln released more heat being combined with oil. Overall, the heterogeneity of clay particles strongly affects the oil–clay interfacial chemical behaviors, causing more difficulty in treating PCS containing Kln than those containing Mnt. These results provide a theoretical basis for PCS treatment technology.

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Effects of Hot Water-Based Extraction Process on the Removal of Petroleum Hydrocarbons from the Oil-Contaminated Soil

Cited by 7 publications

References 33 publications

Application and Development of Chemical Heat Washing Technology in Petroleum Oily Sludge Treatment: A Review

Application and Development of Chemical Heat Washing Technology in Petroleum Oily Sludge Treatment: A Review

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Interfacial Interaction of Clay and Saturates in Petroleum-Contaminated Soil: Effect of Clay Surface Heterogeneity

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