New insights into interaction between oil and solid during hydrothermal treatment of oily sludge

Li，Qi1,2; Sun，Dejun1; Chen，Feng1; Xu，Haoran1; Xu，Zhenghe3

2024-06-05

10.1016/j.jhazmat.2024.134358

Journal of Hazardous Materials   影响因子和分区

0304-3894

1873-3336

Hydrothermal treatment (HT) can effectively dehydrate and reduce oily sludge (OS) volume, but the resulting hydrothermal oily sludge (HOS) presents greater challenges for washing than the initial oily sludge (IOS). This study examines the effects of HT on OS by analyzing changes in water, oil, and solid. Results indicate that HT considerably decreases the water content in OS while increasing resin and asphaltenes contents. In addition, condensation, side-chain scission, and oxidation reactions occur during the HT process, resulting in coking, agglomeration, and an increase in oxygen-containing groups. This increase, further confirmed by X-ray photoelectron spectroscopy (XPS), enhances the interaction between oil and solids. Calcite, the most prevalent solid-phase component, may form a calcium bridge with the oxygen-containing groups. Moreover, HT reduces the solid particle size, thereby increasing the oil–solid contact area. Interestingly, the process of deasphalting diminishes the interaction between oil and solids, facilitating sludge washing. After washing, the residual oil content in HOS is reduced to less than 0.34%. This study elucidates why HOS is challenging to separate from oil and solids and introduces a novel method that combines dodecylbenzene sulfonic acid (DBSA)-assisted heptane deasphalting with conventional washing techniques. This method shows promise for applications in OS affected by weathering processes.

Deasphalting Dodecylbenzene sulfonic acid Hydrothermal treatment Oily sludge Oil–solid separation Washing

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85190837500

Scopus

1.Key Laboratory of Colloid and Interface Chemistry,Shandong University,Ministry of Education,Jinan,Shandong,250100,China
2.Tianjin Key Laboratory of Tertiary Oil Recovery and Oilfield Chemistry Enterprises,Oil Production Technology Institute,Dagang Oilfield Company,PetroChina,Tianjin,300280,China
3.Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Li，Qi,Sun，Dejun,Chen，Feng,et al. New insights into interaction between oil and solid during hydrothermal treatment of oily sludge[J]. Journal of Hazardous Materials,2024,471.

Li，Qi,Sun，Dejun,Chen，Feng,Xu，Haoran,&Xu，Zhenghe.(2024).New insights into interaction between oil and solid during hydrothermal treatment of oily sludge.Journal of Hazardous Materials,471.

Li，Qi,et al."New insights into interaction between oil and solid during hydrothermal treatment of oily sludge".Journal of Hazardous Materials 471(2024).