Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water
Oily wastewater is extensively generated during the petroleum extraction and refining processes, as crude oil production water and from the effluent systems in petrochemical enterprises. The discharge standards for such wastewater are stringent, with the Oslo–Paris Convention stipulating that the oi...
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/2297-8739/12/7/174 |
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| author | Tao Yang Hao Xiao Chunyu Jiang Ming Ma Guangwen Zhang Chun Wang Yi Zheng Xiangdi Zhao |
| author_facet | Tao Yang Hao Xiao Chunyu Jiang Ming Ma Guangwen Zhang Chun Wang Yi Zheng Xiangdi Zhao |
| author_sort | Tao Yang |
| collection | DOAJ |
| description | Oily wastewater is extensively generated during the petroleum extraction and refining processes, as crude oil production water and from the effluent systems in petrochemical enterprises. The discharge standards for such wastewater are stringent, with the Oslo–Paris Convention stipulating that the oil content must be below 30 mg/L for permissible discharge. Flotation, a conventional oil–water separation method, relies on the collision and adhesion of rising bubbles with oil droplets in water to form low-density aggregates that float to the surface for separation. The collision and adhesion mechanisms between bubbles and oil droplets are fundamental to this process. However, systematic studies on their interactions remain scarce. This study employs the extended Derjaguin–Landau–Verwey–Overbeek theory to analyze the three mechanical interactions during the collision–adhesion process theoretically and investigates the heterogeneous interaction dynamics experimentally. Furthermore, given the diverse liquid-phase environments of oily wastewater, the effects of salinity, pH, and surfactant concentration are decoupled and individually explored to clarify their underlying mechanisms. Finally, a solution is proposed to enhance the flotation efficiency fundamentally. This work systematically elucidates the influence of liquid-phase environments on the adhesion behavior for the first time through the unification of theoretical and experimental approaches. The findings provide critical insights for advancing flotation theory and guiding the development of novel coagulants. |
| format | Article |
| id | doaj-art-e44946c843fc4be5b765f4574b4a20ff |
| institution | DOAJ |
| issn | 2297-8739 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Separations |
| spelling | doaj-art-e44946c843fc4be5b765f4574b4a20ff2025-08-20T02:47:10ZengMDPI AGSeparations2297-87392025-06-0112717410.3390/separations12070174Heterogeneous Interactions During Bubble–Oil Droplet Contact in WaterTao Yang0Hao Xiao1Chunyu Jiang2Ming Ma3Guangwen Zhang4Chun Wang5Yi Zheng6Xiangdi Zhao7State Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaState Key Laboratory of Chemical Safety, Qingdao 266000, ChinaOily wastewater is extensively generated during the petroleum extraction and refining processes, as crude oil production water and from the effluent systems in petrochemical enterprises. The discharge standards for such wastewater are stringent, with the Oslo–Paris Convention stipulating that the oil content must be below 30 mg/L for permissible discharge. Flotation, a conventional oil–water separation method, relies on the collision and adhesion of rising bubbles with oil droplets in water to form low-density aggregates that float to the surface for separation. The collision and adhesion mechanisms between bubbles and oil droplets are fundamental to this process. However, systematic studies on their interactions remain scarce. This study employs the extended Derjaguin–Landau–Verwey–Overbeek theory to analyze the three mechanical interactions during the collision–adhesion process theoretically and investigates the heterogeneous interaction dynamics experimentally. Furthermore, given the diverse liquid-phase environments of oily wastewater, the effects of salinity, pH, and surfactant concentration are decoupled and individually explored to clarify their underlying mechanisms. Finally, a solution is proposed to enhance the flotation efficiency fundamentally. This work systematically elucidates the influence of liquid-phase environments on the adhesion behavior for the first time through the unification of theoretical and experimental approaches. The findings provide critical insights for advancing flotation theory and guiding the development of novel coagulants.https://www.mdpi.com/2297-8739/12/7/174oil–water separationextended DLVO theoryheterogeneous interactioninduction time |
| spellingShingle | Tao Yang Hao Xiao Chunyu Jiang Ming Ma Guangwen Zhang Chun Wang Yi Zheng Xiangdi Zhao Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water Separations oil–water separation extended DLVO theory heterogeneous interaction induction time |
| title | Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water |
| title_full | Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water |
| title_fullStr | Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water |
| title_full_unstemmed | Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water |
| title_short | Heterogeneous Interactions During Bubble–Oil Droplet Contact in Water |
| title_sort | heterogeneous interactions during bubble oil droplet contact in water |
| topic | oil–water separation extended DLVO theory heterogeneous interaction induction time |
| url | https://www.mdpi.com/2297-8739/12/7/174 |
| work_keys_str_mv | AT taoyang heterogeneousinteractionsduringbubbleoildropletcontactinwater AT haoxiao heterogeneousinteractionsduringbubbleoildropletcontactinwater AT chunyujiang heterogeneousinteractionsduringbubbleoildropletcontactinwater AT mingma heterogeneousinteractionsduringbubbleoildropletcontactinwater AT guangwenzhang heterogeneousinteractionsduringbubbleoildropletcontactinwater AT chunwang heterogeneousinteractionsduringbubbleoildropletcontactinwater AT yizheng heterogeneousinteractionsduringbubbleoildropletcontactinwater AT xiangdizhao heterogeneousinteractionsduringbubbleoildropletcontactinwater |