Performance of dispersed oil and suspended sediment during the oil-sediment aggregation process

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

doi:10.1016/j.marpolbul.2021.112455

Cited by 16 publications

(8 citation statements)

References 60 publications

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“…In experimental groups, the mass concentrations of particles, YYS crude oil, and bacteria were 1500, 500, and 1500 mg/L (mass ratio 3:1:3) or 50, 500, and 50 mg/L (mass ratio 1:10:1), respectively. The particle concentration range used was that observed in the natural nearshore environment. ,,, A high particle concentration provides more opportunities for OPA formation, facilitates the fragmentation of oil droplets, and increases the amount of captured oil. ,,, For the control group (section 2 of the SI), the mass concentrations of particles and YYS crude oil were 1500 and 500 mg/L (mass ratio 3:1) or 50 and 500 mg/L (mass ratio 1:10), respectively. Three parallel experiments were set up for each sample.…”

Section: Methodsmentioning

confidence: 99%

“…12,30,40,43 A high particle concentration provides more opportunities for OPA formation, facilitates the fragmentation of oil droplets, and increases the amount of captured oil. 30,40,44,45 For the control group (section 2 of the SI), the mass concentrations of particles and YYS crude oil were 1500 and 500 mg/L (mass ratio 3:1) or 50 and 500 mg/L (mass ratio 1:10), respectively. Three parallel experiments were set up for each sample.…”

Section: Methodsmentioning

confidence: 99%

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The Role of Bacteria in the Formation and Migration of Oil–Particle Aggregates (OPAs) after Marine Oil Spills and the Associated Mechanism

Dong

Wan

Wang³

et al. 2023

Environ. Sci. Technol.

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Oil spills interact with mineral particles to form oil− particle aggregates (OPAs), which promotes the oil's natural diffusion and biodegradation. We investigated the effect of bacteria on the formation and vertical migration of OPAs under different concentrations and types of particles and proposed and elucidated an oil− particle−bacteria coupling mechanism. The depth of particle penetration into oil droplets (13−17 μm) was more than twice that of the nonbacterial group. Oil that remained in the water column and deposited to the bottom decreased from 87% to 49% and increased from 14% to 15% at high/low concentration, respectively. Interestingly, the median droplet diameter showed a negative correlation (R 2 = 0.83) and positive correlation (R 2 = 0.60) at high/low concentration, respectively, with the relative penetration depth first proposed. We further demonstrated that bacteria increased the penetrating depth by a combination of reducing/increasing the interfacial tension, reducing the oil amount (C 17 −C 38 ) in the OPAs, and increasing the particle width. These effects reduced the droplet size and ultimately changed the vertical migration of OPAs. Finally, we provided a simple assessment of the vertical distribution of OPAs in nearshore environments based on experimental data and suggested that the role of bacteria in increasing the depth of particles penetrating into the oil droplets should not be ignored. These findings will broaden the research perspective of marine oil spill migration.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The Role of Bacteria in the Formation and Migration of Oil–Particle Aggregates (OPAs) after Marine Oil Spills and the Associated Mechanism

Dong

Wan

Wang³

et al. 2023

Environ. Sci. Technol.

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“…The effective density of individual OPA ( ρ e ) was determined by an empirical equation in our previous study (Qi et al., 2021):

\rho =\rho -{\rho }_{s}=33.49\cdot \frac{{v}_{a}{\rho }_{s}{u}_{s}}{g{{D}_{a}}^{2}},

where ρ opa is the bulk density of OPA, V a is the settling velocity, D a is the sphere‐equivalent diameter of OPA, g is the gravitational acceleration, and ρ s and υ s are the density and the kinematic viscosity of seawater, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The effective density of individual OPA (ρ e ) was determined by an empirical equation in our previous study (Qi et al, 2021):…”

Section: Analysis Of the Density Of Opasmentioning

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

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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.

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“…Under appropriate conditions, up to 20% of the spilled oil can interact with particulate matter, and the oil content of the formed OMA after spraying oil dispersant accounts for 65% of the total spilled oil (Bandara et al, 2011). As polycyclic aromatic hydrocarbons (PAHs) persist much longer in the sediment phase than at the sea surface (Harayama et al, 1999), these oil-bearing aggregates will exist on the seabed for a long time, resulting in excessive petroleum hydrocarbon contaminant, especially toxic PAHs, posing a serious threat to both the benthic communities and marine environment (Gao et al, 2019;Qi et al, 2021;Suneel et al, 2021). Common oil spill responses are mostly applicable to the oating oil but ineffective for the sunken oil (IMO, 2012; Usher, 2009).…”

Section: Introductionmentioning

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

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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.

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Performance of dispersed oil and suspended sediment during the oil-sediment aggregation process

Cited by 16 publications

References 60 publications

The Role of Bacteria in the Formation and Migration of Oil–Particle Aggregates (OPAs) after Marine Oil Spills and the Associated Mechanism

The Role of Bacteria in the Formation and Migration of Oil–Particle Aggregates (OPAs) after Marine Oil Spills and the Associated Mechanism

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

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

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