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Fu H, Liu W, Sun X, Zhang F, Wei J, Li Y, Li Y, Lu J, Bao M. Assessment of spilled oil dispersion affected by dispersant: Characteristic, stability, and related mechanism. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 358:120888. [PMID: 38615399 DOI: 10.1016/j.jenvman.2024.120888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 02/26/2024] [Accepted: 04/10/2024] [Indexed: 04/16/2024]
Abstract
Oil dispersion, a crucial process in oil transport, involves the detachment of oil droplets from slicks and their introduction into the water column, influencing subsequent oil migration and transformation. This study examines oil dispersion, considering characteristics, stability, and mechanisms, while evaluating the impact of dispersants and salinity. Results show the significant role of surfactant type in dispersants on oil dispersion characteristics, with anionic surfactants exhibiting higher sensitivity to salinity changes compared to nonionic surfactants. The dispersion efficiency varies with salinity, with anionic surfactants performing better in low salinity (<20‰) and nonionic surfactants showing superior performance at 30-35‰ salinities. Rheological analysis illustrates the breakup and coalescence of oil droplets within the shear rates of breaking waves. An increase in interfacial film rigidity impedes the coalescence of oil droplets, contributing to the dynamic stability of the oil-water hybrid system. The use of GM-2, a nonionic dispersant, results in the formation of a solid-like interface, characterized by increased elastic modulus, notably at 20‰ salinity. However, stable droplet size distribution (DSD) at 35‰ salinity for 60 h suggests droplets can remain dispersed in seawater. The enhancement of stability of oil dispersion is interpreted as the result of two mechanisms: stabilizing DSD and developing the strength of viscoelastic interfacial film. These findings offer insights into oil dispersion dynamics, highlighting the importance of surfactant selection and salinity in governing dispersion behavior, and elucidating mechanisms underlying dispersion stability.
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Affiliation(s)
- Hongrui Fu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
| | - Wei Liu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Xiaojun Sun
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Feifei Zhang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Jing Wei
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Yang Li
- China Petrochemical Corporation (Sinopec Group), Beijing, 100728, China
| | - Yiming Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Jinren Lu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
| | - Mutai Bao
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
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2
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Fu H, Kang Q, Sun X, Liu W, Li Y, Chen B, Zhang B, Bao M. Mechanism of nearshore sediment-facilitated oil transport: New insights from causal inference analysis. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133187. [PMID: 38104519 DOI: 10.1016/j.jhazmat.2023.133187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/12/2023] [Accepted: 12/04/2023] [Indexed: 12/19/2023]
Abstract
A quantitative understanding of spilled oil transport in a nearshore environment is challenging due to the complex physicochemical processes in aqueous conditions. The physicochemical processes involved in oil sinking mainly include oil dispersion, sediment settling, and oil-sediment interaction. For the first time, this work attempts to address the sinking mechanism in petroleum contaminant transport using structural causal models based on observed data. The effects of nearshore salinity distribution from the estuary to the ocean on those three processes are examined. The causal inference reveals sediment settling is the crucial process for oil sinking. Salinity indirectly affects oil sinking by promoting sediment settling rather than directly affecting oil-sediment interaction. The increase of salinity from 0‰ to 35‰ provides a natural enhancement for sediment settling. Notably, unbiased causal effect estimates demonstrate the strongest positive causal effect on the settling efficiency of sediments is posed by increasing oil dispersion effectiveness, with a normalized value of 1.023. The highest strength of the causal relationship between oil dispersion and sediment settling highlights the importance of the dispersing characteristics of spilled oil to sediment-facilitated oil transport. The employed logic, a data-driven method, will shed light on adopting advanced causal inference tools to unravel the complicated contaminants' transport.
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Affiliation(s)
- Hongrui Fu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Qiao Kang
- The Northern Region Persistent Organic Pollution (NRPOP) Control Laboratory, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL A1B 3×5, Canada
| | - Xiaojun Sun
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Wei Liu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yang Li
- China Petrochemical Corporation (Sinopec Group), Beijing 100728, China
| | - Bing Chen
- The Northern Region Persistent Organic Pollution (NRPOP) Control Laboratory, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL A1B 3×5, Canada
| | - Baiyu Zhang
- The Northern Region Persistent Organic Pollution (NRPOP) Control Laboratory, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL A1B 3×5, Canada
| | - Mutai Bao
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
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3
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Li W, Qi Z, Xiong D, Wu Y, Wang W, Qi Y, Guo J. Formation and sedimentation of oil-mineral aggregates in the presence of chemical dispersant. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:1937-1944. [PMID: 37786335 DOI: 10.1039/d3em00327b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
The formation and sedimentation of oil-mineral aggregates (OMAs) is the major method to transport spilled oil to the seafloor. In this study, the formation and sedimentation experiments of OMA using montmorillonite and four crude oils were performed in a wave tank in the presence of chemical dispersant. Most of the formed OMAs were droplet OMAs, and single droplet OMA would aggregate into multiple ones under the action of the dispersant. The size of the oil droplets trapped in the OMA increased with time and was larger for the oil with higher viscosity. The sinking velocities of OMAs formed in this study were between 100-1200 μm s-1 and they were positively correlated with their diameter. The density of OMA was of the same order as that of the crude oil that formed them. An increase in the dispersant dosage could promote the formation of OMAs. The oil content in OMAs was higher for the denser oil in the presence of a dispersant. The maximum oil trapping efficiency of OMAs was 48.05%. This study provides fundamental data on the formation kinetics of OMAs.
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Affiliation(s)
- Wenxin Li
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Zhixin Qi
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Deqi Xiong
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Yifei Wu
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Wei Wang
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Yajing Qi
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
| | - Jian Guo
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian 116026, China.
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4
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Yu X, Qi Z, Xiong D, An Y, Gao H, Yang M, Liu Z. Impact of mixing energy and dispersant dosage on oil dispersion and sedimentation with microplastics in the marine environment. MARINE POLLUTION BULLETIN 2023; 195:115542. [PMID: 37714077 DOI: 10.1016/j.marpolbul.2023.115542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/05/2023] [Accepted: 09/10/2023] [Indexed: 09/17/2023]
Abstract
Recently, the fate of spilled oil in the presence of microplastics (MPs) in the sea has attracted attention of researchers. Merey crude oil and polyethylene terephthalate (PET) were used as the experimental materials in this study. The effects of mixing energy and dispersant dosage on oil dispersion and sedimentation in the presence of MPs in the water column were investigated by laboratory experiments simulating actual sea conditions. The increase of mixing energy showed a promoting effect on oil dispersion. When the oscillation frequency increased from 140 rpm to 180 rpm, the oil dispersion efficiency (ODE) ranged from 2.1 %-3.7 % to 17.4 %-30.8 %, and the volumetric mean diameter (VMD) of the suspended oil droplets/MPs-oil agglomerates (MOA) decreased from 99.9-131.4 μm to 76.6-88.2 μm after 2 h oscillation. The application of chemical dispersant led to an increase in both the quantity and size of the formed sunken MPs-oil-dispersant agglomerates (MODA). At the dispersant-to-oil ratio (DOR) of 1:5, the ODE declined from 77.7 % to 62.6 % when the MPs concentration increased from 0 to 150 mg/L, while the oil sinking efficiency (OSE) rose from 3.4 % to 15.6 % when the MPs increased from 25 to 150 mg/L; the maximum size of the sunken MODA reached 13.0 mm, and the total volume of the MODA formed per unit volume oil reached 389.7 μL/mL oil at the MPs concentration of 150 mg/L. Meanwhile, the results showed that the presence of MPs inhibited the oil dispersion by increasing the oil-water interfacial tension. The outcomes of this work may provide assistance in predicting the transport of spilled oil and developing emergency measures.
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Affiliation(s)
- Xinping Yu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Zhixin Qi
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Deqi Xiong
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Yaya An
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Huan Gao
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Miao Yang
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Ziyue Liu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
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Qi Z, Wang Z, Yu Y, Yu X, Sun R, Wang K, Xiong D. Formation of oil-particle aggregates in the presence of marine algae. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:1438-1448. [PMID: 37424387 DOI: 10.1039/d3em00092c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
After an oil spill, the formation of oil-particle aggregates (OPAs) is associated with the interaction between dispersed oil and marine particulate matter such as phytoplankton, bacteria and mineral particles. Until recently, the combined effect of minerals and marine algae in influencing oil dispersion and OPA formation has rarely been investigated in detail. In this paper, the impacts of a species of flagellate algae Heterosigma akashiwo on oil dispersion and aggregation with montmorillonite were investigated. This study has found that oil coalescence is inhibited due to the adhesion of algal cells on the droplet surface, causing fewer large droplets to be dispersed into the water column and small OPAs to form. Due to the role of biosurfactants in the algae and the inhibition of algae on the swelling of mineral particles, both the oil dispersion efficiency and oil sinking efficiency were improved, which reached 77.6% and 23.5%, respectively at an algal cell concentration (Ca) of 1.0 × 106 cells per mL and a mineral concentration of 300 mg L-1. The volumetric mean diameter of the OPAs decreased from 38.4 μm to 31.5 μm when Ca increased from 0 to 1.0 × 106 cells per mL. At higher turbulent energy, more oil tended to form larger OPAs. The findings may add knowledge about the fate and transport of spilled oil and provide fundamental data for oil spill migration modelling.
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Affiliation(s)
- Zhixin Qi
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Zhennan Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Yue Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
- National Maritime Environmental Monitoring Center, Dalian 116023, China
| | - Xinping Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Ruiyang Sun
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Kaiming Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Deqi Xiong
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China.
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Wang PS, Ahmad A, Nazar M, Rahmah AU, Moniruzzaman M. Biocompatible and Biodegradable Surfactants from Orange Peel for Oil Spill Remediation. Molecules 2023; 28:5794. [PMID: 37570764 PMCID: PMC10421384 DOI: 10.3390/molecules28155794] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/24/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
Oil spill remediation plays a vital role in mitigating the environmental impacts caused by oil spills. The chemical method is one of the widely recognized approaches in chemical surfactants. However, the most commonly used chemical surfactants are toxic and non-biodegradable. Herein, two biocompatible and biodegradable surfactants were synthesized from orange peel using the ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCl) and organic solvent dimethylacetamide (CH3CN(CH3)2) as reaction media. The acronyms SOPIL and SOPOS refer to the surfactants prepared with BMIMCl and dimethylacetamide, respectively. The surface tension, dispersant effectiveness, optical microscopy, and emulsion stability test were conducted to examine the comparative performance of the synthesized surfactants. The Baffled flask test (BFT) was carried out to determine the dispersion effectiveness. The toxicity test was performed against zebrafish (Danio rerio), whereas the closed bottle test (CBT) evaluated biodegradability. The results revealed that the critical micelle concentration (CMC) value of SOPIL was lower (8.57 mg/L) than that of SOPOS (9.42 mg/L). The dispersion effectiveness values for SOPIL and SOPOS were 69.78% and 40.30%, respectively. The acute toxicity test demonstrated that SOPIL was 'practically non-toxic' with a median lethal concentration of more than 1000 mg/L after 96 h. The biodegradation rate was recorded as higher than 60% for both surfactants within 28 days, demonstrating their readily biodegradable nature. Considering these attributes, biocompatible and biodegradable surfactants derived from orange peel emerge as a promising and sustainable alternative for oil spill remediation.
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Affiliation(s)
- Peng Soon Wang
- Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; (P.S.W.); (A.A.); (M.N.)
| | - Aqeel Ahmad
- Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; (P.S.W.); (A.A.); (M.N.)
| | - Masooma Nazar
- Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; (P.S.W.); (A.A.); (M.N.)
| | - Anisa Ur Rahmah
- Department of Chemical Engineering, Universitas Muhammadiyah Surakarta, Kartasura 57162, Sukoharjo, Indonesia;
| | - Muhammad Moniruzzaman
- Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia; (P.S.W.); (A.A.); (M.N.)
- Center of Research in Ionic Liquids (CORIL), Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak, Malaysia
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7
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Yang M, Zhang B, Chen X, Kang Q, Gao B, Lee K, Chen B. Transport of Microplastic and Dispersed Oil Co-contaminants in the Marine Environment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:5633-5645. [PMID: 36972473 DOI: 10.1021/acs.est.2c08716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Microplastics (MPs) and oil pollution are major concerns in oceans. Although their coexistence in oceans and the associated MP-oil-dispersant agglomerates (MODAs) have been reported, limited attention is given to the behavior of the co-contaminants. This study investigated MODA transport in a simulated ocean system and explored related mechanisms under various oil types, salinities, and mineral concentrations. We found that more than 90% of the heavy oil-formed MODAs stayed at the seawater surface, while the light oil-formed MODAs were widely distributed throughout the seawater column. The increased salinity promoted MODAs formed by 7 and 90 μm MPs to transport from the seawater surface to the column. This was elucidated by the Derjaguin-Landau-Verwey-Overbeek theory as more MODAs formed under higher salinities and dispersants kept them stable in the seawater column. Minerals facilitated the sinking of large MP-formed MODAs (e.g., 40 μm) as minerals were adsorbed on the MODA surface, but their impact on small MP-formed MODAs (e.g., 7 μm) was negligible. A MODA-mineral system was proposed to explain their interaction. Rubey's equation was recommended to predict the sinking velocity of MODAs. This study is the first attempt to reveal MODA transport. Findings will contribute to the model development to facilitate their environmental risk evaluation in oceans.
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Affiliation(s)
- Min Yang
- Northern Region Persistent Organic Pollutant Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Newfoundland A1B3X5, Canada
| | - Baiyu Zhang
- Northern Region Persistent Organic Pollutant Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Newfoundland A1B3X5, Canada
| | - Xiujuan Chen
- Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Qiao Kang
- Northern Region Persistent Organic Pollutant Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Newfoundland A1B3X5, Canada
| | - Boyang Gao
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B3X5, Canada
| | - Kenneth Lee
- Fisheries and Oceans Canada, Ecosystem Science, Ottawa, Ontario K1A 0E6, Canada
| | - Bing Chen
- Northern Region Persistent Organic Pollutant Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Newfoundland A1B3X5, Canada
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Fahmi Alali A, Wang S, Zhu Z, Atkinson J. Formation of oil-particle aggregates with motor oil and kaolinite clay in cold and warm freshwater. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:566-576. [PMID: 36727406 DOI: 10.1039/d2em00364c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Motor oil is one of the most common pollutants in stormwater runoff in freshwater ecosystems. It can form aggregates with solids (creating oil particle aggregates, OPAs) which complicates the understanding of the fate and transport of motor oil, particularly in cold freshwater, conditions that have not been studied extensively. Laboratory and numerical experiments were conducted with kaolinite clay and three types of motor oil in both cold and warm freshwater, in which: (1) the interaction of clay particles with motor oil was experimentally investigated, in response to changes in oil viscosity, water temperature, and mixing intensity; (2) variability in particle size distribution of the formed OPAs was measured; and (3) a mechanistic OPA formation model was applied and results were compared with experimental data. The results showed that kaolinite clay and motor oil formed mostly droplet-type OPAs, lower-viscosity oil tended to form a wider size range of OPAs, and higher mixing intensity and higher water temperature produced larger numbers of smaller OPAs. Although there was a reasonably good match between the experimental data and the modeling results, more research is needed to further improve the modeling framework.
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Affiliation(s)
- Abdulrhman Fahmi Alali
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Department of Civil Engineering, King Saud University, P. O. Box 800, Riyadh 11421, Saudi Arabia
| | - Shu Wang
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China
| | - Zhenduo Zhu
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Joseph Atkinson
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
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Fu H, Li H, Bao M, Liu Y, Wei L, Ju L, Cao R, Li Y. Mesoscale evaluation of oil submerging and floating processes during marine oil spill response: Effects of dispersant on submerging stability and the associated mechanism. JOURNAL OF HAZARDOUS MATERIALS 2022; 436:129153. [PMID: 35739699 DOI: 10.1016/j.jhazmat.2022.129153] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/05/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
The migration of oil spills in marine environment is still not clear, especially the key processes of submerging and floating, which is an important concern for effective disposal of oil spills. In mesoscale wave tank (32 m × 0.8 m × 2 m), this study has evaluated the characteristics of oil submergence based on oil concentration and oil droplet size. The concept of effective submergence is put forward for the first time, utilized to analyze the effects of dispersant on submerging stability and associated mechanisms. The results indicate dispersants increase submerged oil concentration and promote homogeneous distribution and vertical penetration. Of concern is that dispersants increase the proportion of small oil droplets (2.5-70 µm), prolonging the residence time of oil droplets in water by delaying the floating process. Dispersants sharply reduce oil droplets size (VMD<44 µm) thus decreasing the coalescence probability. These contribute to better submerging stability. By contrast, the submerged oil, formed as oil patches, oil streamers, and large oil droplets (VMD>170 µm) when without dispersant, will float and reattach to oil slicks more quickly due to their large volume. These findings help to clarify spilled oil behaviors and provide a new idea for the research on oil submergence.
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Affiliation(s)
- Hongrui Fu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Haoshuai Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
| | - Mutai Bao
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
| | - Yunlong Liu
- North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China; Key Laboratory of Ecological Prewarning,Protection and Restoration of Bohai Sea, Ministry of Natural Resources, Qingdao 266033, China
| | - Lai Wei
- North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China; Key Laboratory of Ecological Prewarning,Protection and Restoration of Bohai Sea, Ministry of Natural Resources, Qingdao 266033, China
| | - Lian Ju
- North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China; Key Laboratory of Ecological Prewarning,Protection and Restoration of Bohai Sea, Ministry of Natural Resources, Qingdao 266033, China
| | - Ruichen Cao
- Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES), and Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China
| | - Yang Li
- China Petrochemical Corporation (Sinopec Group), Beijing 100728, China
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Li W, Yu Y, Xiong D, Qi Z, Fu S, Yu X. Effects of chemical dispersant on the surface properties of kaolin and aggregation with spilled oil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:30496-30506. [PMID: 35000158 DOI: 10.1007/s11356-021-17746-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 11/21/2021] [Indexed: 06/14/2023]
Abstract
After oil spills occur, dispersed oil droplets can collide with suspended particles in the water column to form the oil-mineral aggregate (OMA) and settle to the seafloor. However, only a few studies have concerned the effect of chemical dispersant on this process. In this paper, the mechanism by which dispersant affects the surface properties of kaolin and the viscosity and oil-seawater interfacial tension (IFTow) of Roncador crude oil were separately investigated by small-scale tests. The results indicated that the presence of dispersant impairs the zeta potential and enhances the hydrophobicity of kaolin. The viscosity of Roncador crude oil rose slightly as the dosage of dispersant increased, while IFTow decreased significantly. Furthermore, the oil dispersion and OMA formation at different dispersant-to-oil ratio (DOR) were evaluated in a wave tank. When DOR was less than 1:40, the effect of dispersant on the dispersion of spilled oil was not obvious. With the increasing DOR, the effect became more pronounced, and the adhesion between oil droplets and kaolin was inhibited. The size ratio between oil droplets and particles is the significant factor for OMA formation. The closer the oil-mineral size ratio is to 1, the more difficultly the OMA forms.
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Affiliation(s)
- Wenxin Li
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China
| | - Yue Yu
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China
| | - Deqi Xiong
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China.
| | - Zhixin Qi
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China
| | - Sinan Fu
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China
| | - Xinping Yu
- Coll Environm Sci & Engn, Dalian Maritime Univ, Dalian, 116026, China
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Yu Y, Qi Z, Xiong D, Li W, Yu X, Sun R. Experimental investigations on the vertical distribution and properties of oil-mineral aggregates (OMAs) formed by different clay minerals. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 311:114844. [PMID: 35276564 DOI: 10.1016/j.jenvman.2022.114844] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/01/2022] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
After oil spills, the floating oil may interact with suspended minerals to form the oil-mineral aggregates (OMAs) in turbulent environments. In this work, a flume was used in conjunction with a settling device to investigate the vertical distribution and properties of OMAs formed by different clay minerals. The density and size of OMAs depend on the density and surface properties of the constituent particles, which also affect the vertical distribution of dispersed oil. Density of oil-montmorillonite aggregates increased from 1165 to 1897 kg/m3 within 6 h test. Among the four minerals, montmorillonite displayed the highest affinity with dispersed oil and the most significant modification of oil-water interfacial tension. Oil dispersion efficiency was significantly greater and reached 39.3% in the presence of montmorillonite at 300 mg/L compared with the control group (17.6%). Particle concentration is the most important factor for the capture of oil and participation of particles during the OMA formation, while the zeta potential and hydrophobicity have nonsignificant effect on the two processes. Cation exchange capacity has a moderate effect on the sunken oil formation, which is also the second main factor governing the particle participation. Particle size plays a second leading role in governing the sunken oil formation but with a minor contribution of the particle participation.
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Affiliation(s)
- Yue Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Zhixin Qi
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
| | - Deqi Xiong
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
| | - Wenxin Li
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Xinping Yu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Ruiyang Sun
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
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Qi Z, Sun R, Yu Y, Xiong D, Li W, Yu X, Fu S. Performance of dispersed oil and suspended sediment during the oil-sediment aggregation process. MARINE POLLUTION BULLETIN 2021; 168:112455. [PMID: 34020408 DOI: 10.1016/j.marpolbul.2021.112455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 04/28/2021] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
Oil-sediment aggregation is an important transport and transformation process of spilled oil, which has been considered as a pathway of spill remediation. This work focused on the individual performance of dispersed oil and sediment during the aggregation process. Dispersion of three oils was first tested and validated in a water tank. An approach of estimating the mass variation of the sediment that has participated in forming the oil-sediment aggregates (OSAs) has been developed by density analysis. Results indicated that the density of the formed OSAs increases during the aggregation. In the context of remediation, it takes longer for sediment to reach equilibrium than for dispersed oil, especially under high mixing energy at a large sediment concentration, which results in the formation of dense OSAs, as well as high aggregation degree and rate. Roncador oil possesses a relatively high capability of capturing sediment to form dense OSAs, especially at an initial sediment concentration of over 150 mg/L. Oil sinking efficiency and the characteristic change rate of aggregated oil mass seem to be proportional to oil dispersion efficiency, and decrease with the mean size of dispersed oil droplets. The process of aggregation can further promote the dispersion of oil into water column. This study also provides fundamental data for the formation kinetics of OSAs.
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Affiliation(s)
- Zhixin Qi
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Ruiyang Sun
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Yue Yu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Deqi Xiong
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Wenxin Li
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Xinping Yu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Sinan Fu
- College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
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Yu Q, Jiang Z, Yu Y, Yang H, Sun X, Wang C, Ho SH. Synchronous removal of emulsions and organic dye over palladium nanoparticles anchored cellulose-based membrane. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 288:112402. [PMID: 33774564 DOI: 10.1016/j.jenvman.2021.112402] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/11/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Membrane is a considerable precursor for emulsions separation and organic dyes degradation used in water purification and oil reclamation. However, the tedious preparation method, the surface smears easily, and low degradation efficiency, these characteristics usually significantly hinder its applicability toward wastewater governance. Herein, a green, facile, and efficient fabrication strategy to prepare a bi-functional palladium nanoparticles (PdNPs)-loaded bacterial cellulose membrane (BCMPd) is proposed. A tri-functional bacterial cellulose membrane (BCM) was obtained by percolating bacterial cellulose (BC) on a basal membrane, and BCM served as a support, reducing agent, and stabilizer in the subsequent reduction of PdNPs. Bi-functional BCMPd was successfully obtained and used for continuously removing emulsions and reducing methylene blue (MB) from simulated wastewater via the integration of physical sieving and chemical reaction. Meanwhile, the enhancement factors for the water transfer ability and demulsification capacity correlated directly with the wettability and surface structure of BCMPd. Furthermore, the dosage of BC was adjusted to reveal the mechanism for the enhanced water transferability and demulsification capacity. Notably, PdNPs of BCMPd decreased Fermi potential difference between BH4- and MB, accelerating the electron transfer of the reduction reaction and thus exhibiting a remarkable MB degradation efficiency. Together, the information obtained in this work can be useful for comprehensively addressing the bottleneck of forming a cost-effective, eco-friendly, and bi-functional membrane reactor, providing an alternative approach for better treatment of complex wastewater.
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Affiliation(s)
- Qianqian Yu
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China
| | - Zishuai Jiang
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China
| | - Yuan Yu
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China
| | - Haiyue Yang
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China
| | - Xiaohan Sun
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China
| | - Chengyu Wang
- Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, PR China.
| | - Shih-Hsin Ho
- State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin, 150040, PR China.
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