Effect of the concentration and size of suspended particulate matter on oil-particle aggregation

Qi, Zhixin; Yu, Yue; Yu, Xinping; Li, Wenxin; Fu, Sinan; Xiong, Dangsheng

doi:10.1016/j.marpolbul.2020.110957

Cited by 19 publications

(11 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extent of OPA formation changes abruptly with increasing particle concentration ( C par ; Figure 7b). When C par is above a certain threshold, the free oil is consumed by sediments at a fixed ratio, although more oil can be captured, which is consistent with the findings of our previous work (Qi et al., 2020; Yu et al., 2019).…”

Section: Discussionsupporting

confidence: 91%

“…There is a critical sediment concentration for the OPA formation. Generally, no OPA forms when SPM is or below 10 mg/L, and oil‐particle aggregation is greatly enhanced when SPM is above 50 mg/L (Ajijolaiya et al., 2006; Qi et al., 2020). Turbulent energy in the aquatic environment determines the size of oil droplets and the collision rate between sediment particles and oil droplets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Oil and Sediment Properties and Mixing States on the Formation and Settling of Oil‐Particle Aggregates

Xiong

et al. 2022

JGR Oceans

Self Cite

View full text Add to dashboard Cite

Understanding the interaction of oil droplets with suspended particulate matter is important not only for sunken oil modeling but also for emergency response. In this study, the effects of mixing time and energy, oil type, and sediment concentration and size on the oil content, morphology, and density of oil‐particle aggregates (OPAs) were investigated through a series of wave tank experiments and sedimentation tests. The results showed that loads of oil and particles in OPAs are high under high mixing energy. Under turbulent hydrodynamics, moderately viscous oils form OPAs more easily and sink rapidly to the seabed. Moreover, an increase in the density and oil capacity of OPAs is observed at a higher sediment concentration. More oil is captured by finer sediments. However, the corresponding oil‐sediment aggregates generally show lower density compared with those formed by larger sediments. The oil‐seawater interfacial tension (IFTow) diminishes with the addition of sediments, further promoting oil dispersion. The increasing duration and mixing energy produce more flake OPAs and multiple‐droplet OPAs. Oil droplets tend to be surrounded by several small particles but attach to the surface of large particles. Regardless of oil type and sediment concentration, the structure of OPAs does not change significantly.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effects of Oil and Sediment Properties and Mixing States on the Formation and Settling of Oil‐Particle Aggregates

Xiong

et al. 2022

JGR Oceans

Self Cite

View full text Add to dashboard Cite

show abstract

“…Here, we proposed a MODA-mineral system to explain the impacts of minerals on MODA transport and the change of the system with increasing mineral concentration. Three mineral concentrations (0, 500, and 1000 mg/L) were adopted to simulate natural ocean conditions . The DOR of 1:25 and mixing energy of 5.62 × 10 –1 W/kg were applied to simulate the surface dispersant application in real ocean conditions, which ensured MPs and oil be sufficiently dispersed in seawater .…”

Section: Resultsmentioning

confidence: 99%

“…In each run, kaolinites were added to the mixture to achieve the mineral concentrations of 0, 100, 300, 500, 750, and 1000 mg/L. These mineral concentration levels were selected to simulate different ocean conditions. , The mixture was shaken for 10 min and kept still for 10 min. The other steps were the same as described in MODA transport under various oil types and MP sizes.…”

Section: Methodsmentioning

confidence: 99%

Transport of Microplastic and Dispersed Oil Co-contaminants in the Marine Environment

Yang

Zhang

Chen

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

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 cocontaminants. 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 MPformed 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.

show abstract

“…Although the chemical dispersant effectively promotes the dispersion of spilled oil and increases the oil concentration in the water column, it also dramatically reduces the size of the dispersed oil droplets, making the size between the minerals and the oil droplets closer. Since OMA majority performed as an oil droplet coated uniformly by small minerals (oil droplets larger than minerals) (Yu et al, 2019a;Qi et al, 2020), the closer the size of oil droplets is to that of minerals, the more di cult it is to form OMA.…”

Section: Effects Of Dispersant On the Oil Dispersion And Oma Formationmentioning

confidence: 99%

Effects of chemical dispersant on the surface properties of kaolin and aggregation with spilled oil

Xiong

et al. 2022

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

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 sea oor. 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 as well as the viscosity and oil-seawater interfacial tension (IFT ow ) 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 IFT ow decreased signi cantly. Furthermore, the oil dispersion and OMA formation at different dispersantto-oil ratio (DOR) were evaluated in a wave tank. When DOR was less than 1:40, the oil enhancement of dispersant was not signi cant. In comparison, it began to contribute when DOR was over 1:40 and the effect became more pronounced with the increasing DOR. The adhesion between oil droplets and kaolin was inhibited with the increasing DOR. The size ratio between oil droplets and particles is the signi cant factor for OMA formation. The closer the oil-mineral size ratio is to 1, the more di cultly the OMA forms.

show abstract

Effect of the concentration and size of suspended particulate matter on oil-particle aggregation

Cited by 19 publications

References 39 publications

Effects of Oil and Sediment Properties and Mixing States on the Formation and Settling of Oil‐Particle Aggregates

Effects of Oil and Sediment Properties and Mixing States on the Formation and Settling of Oil‐Particle Aggregates

Transport of Microplastic and Dispersed Oil Co-contaminants in the Marine Environment

Effects of chemical dispersant on the surface properties of kaolin and aggregation with spilled oil

Contact Info

Product

Resources

About