Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue
Oil sludge residue, a solid waste from thermal decomposition of oily sludge in petroleum production, lacks properties suitable for engineering use. This study solidified it using cement (OC), cement with steel slag powder (OC-SSP), and cement with fly ash (OC-F). Through unconfined compressive st...
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Elsevier
2025-06-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S259012302501285X |
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| author | Wang Shixin Wu Yankai Yan Fengmei Wang Jianxin Liu Zequn Li Hongjie |
| author_facet | Wang Shixin Wu Yankai Yan Fengmei Wang Jianxin Liu Zequn Li Hongjie |
| author_sort | Wang Shixin |
| collection | DOAJ |
| description | Oil sludge residue, a solid waste from thermal decomposition of oily sludge in petroleum production, lacks properties suitable for engineering use. This study solidified it using cement (OC), cement with steel slag powder (OC-SSP), and cement with fly ash (OC-F). Through unconfined compressive strength (UCS) and pH testing, optimal mix proportions meeting engineering requirements were identified. Subsequently, nano zero-valent iron (nZVI) loaded biochar (BC) was added in varying amounts for comparative tests. The effects of mix proportions and curing age on solidification were evaluated using UCS, pH, and toxicity tests. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) examined microstructural changes and solidification feasibility. Results showed that higher steel slag powder and fly ash proportions significantly increased sample strength. The pH rose with increased cement and steel slag powder but decreased with more fly ash. Adding nZVI-BC improved early-stage strength and reduced pH, though it had minimal impact on later-stage strength. Post-treatment, the solidified residue met toxicity management standards. Microstructural analysis revealed that solidifying agents promoted the formation of reticular hydrated gel products, enhancing microstructural compactness. This provides a scientific foundation and practical reference for optimizing oil sludge residue solidification. The study demonstrates that combining cement with steel slag powder, fly ash, and nZVI-BC can effectively improve the engineering viability of residual while addressing environmental concerns, offering a sustainable approach to managing this petroleum industry byproducts. |
| format | Article |
| id | doaj-art-98bd75ce32054801ae43375518680dac |
| institution | DOAJ |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-98bd75ce32054801ae43375518680dac2025-08-20T03:09:17ZengElsevierResults in Engineering2590-12302025-06-012610521310.1016/j.rineng.2025.105213Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residueWang Shixin0Wu Yankai1Yan Fengmei2Wang Jianxin3Liu Zequn4Li Hongjie5Postgraduate, School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, ChinaAssociate Professor, School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, ChinaSenior Engineer, First-Class Constructor, Shandong Gangwan Construction Group Co., Ltd., Rizhao, Shandong 276800, China; Corresponding author.Postgraduate, School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, ChinaPostgraduate, School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, ChinaPostgraduate, School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, ChinaOil sludge residue, a solid waste from thermal decomposition of oily sludge in petroleum production, lacks properties suitable for engineering use. This study solidified it using cement (OC), cement with steel slag powder (OC-SSP), and cement with fly ash (OC-F). Through unconfined compressive strength (UCS) and pH testing, optimal mix proportions meeting engineering requirements were identified. Subsequently, nano zero-valent iron (nZVI) loaded biochar (BC) was added in varying amounts for comparative tests. The effects of mix proportions and curing age on solidification were evaluated using UCS, pH, and toxicity tests. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) examined microstructural changes and solidification feasibility. Results showed that higher steel slag powder and fly ash proportions significantly increased sample strength. The pH rose with increased cement and steel slag powder but decreased with more fly ash. Adding nZVI-BC improved early-stage strength and reduced pH, though it had minimal impact on later-stage strength. Post-treatment, the solidified residue met toxicity management standards. Microstructural analysis revealed that solidifying agents promoted the formation of reticular hydrated gel products, enhancing microstructural compactness. This provides a scientific foundation and practical reference for optimizing oil sludge residue solidification. The study demonstrates that combining cement with steel slag powder, fly ash, and nZVI-BC can effectively improve the engineering viability of residual while addressing environmental concerns, offering a sustainable approach to managing this petroleum industry byproducts.http://www.sciencedirect.com/science/article/pii/S259012302501285XOil sludge residueSteel slag powderFly ashMicrostructureUnconfined compressive strength |
| spellingShingle | Wang Shixin Wu Yankai Yan Fengmei Wang Jianxin Liu Zequn Li Hongjie Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue Results in Engineering Oil sludge residue Steel slag powder Fly ash Microstructure Unconfined compressive strength |
| title | Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue |
| title_full | Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue |
| title_fullStr | Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue |
| title_full_unstemmed | Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue |
| title_short | Analysis and study of ZVI on the physical properties and microstructure of solidified oil sludge residue |
| title_sort | analysis and study of zvi on the physical properties and microstructure of solidified oil sludge residue |
| topic | Oil sludge residue Steel slag powder Fly ash Microstructure Unconfined compressive strength |
| url | http://www.sciencedirect.com/science/article/pii/S259012302501285X |
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