Enhanced oil–mineral aggregation with modified bentonite

Chen, Li; Zhou, Yanbo; Xiaoqian, Wang; Zwicker, Thomas; Lu, Jun

doi:10.2166/wst.2013.013

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…The abundant chemically dispersed oil droplets, with a smaller size and larger surface area, might sufficiently interact with quartz sand of several micron scales. Considering the hydrophobicity of sediment particles, the addition of a chemical dispersant could enhance the surface hydrophobicity of quartz sand, leading to the improvement in the formation of OSAs [56,57].…”

Section: Discussionmentioning

confidence: 99%

Distribution of Polycyclic Aromatic Hydrocarbons in Sunken Oils in the Presence of Chemical Dispersant and Sediment

Gao

Xiong

et al. 2019

JMSE

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The formation of sunken oils is mainly dominated by the interaction between spilled oils and sediments. Due to their patchiness and invisibility, cleaning operations become difficult. As a result, sunken oils may cause long-term and significant damage to marine benthonic organisms. In the present study, a bench experiment was designed and conducted to investigate the quantitative distribution of polycyclic aromatic hydrocarbons (PAHs) in sunken oils in the presence of chemical dispersant and sediment. The oil sinking efficiency (OSE) of 16 priority total PAHs in the sediment phase was analyzed with different dosages of dispersant. The results showed that the synergistic effect of chemical dispersant and sediment promoted the formation of sunken oils, and the content of PAHs partitioned in the sunken oils increased with the increase of dispersant-to-oil ratios (DORs). Furthermore, with the addition of chemical dispersant, due to the solubility and hydrophobicity of individual PAHs, the high molecular weight (HMW) PAHs with 4–6 rings tended to partition to sediment compared with low molecular weight (LMW) PAHs with 2–3 rings. The synergistic effect of chemical dispersant and sediment could enhance the OSE of HMW PAHs in sunken oils, which might subsequently cause certain risks for marine benthonic organisms.

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Section: Discussionmentioning

confidence: 99%

Distribution of Polycyclic Aromatic Hydrocarbons in Sunken Oils in the Presence of Chemical Dispersant and Sediment

Gao

Xiong

et al. 2019

JMSE

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“…Clays are more effective than other minerals, such as quartz, in part because of they have higher surface area (Omotoso et al, ; Zhang et al, ). Additionally, hydrophobic minerals have a greater tendency to form OPAs than hydrophilic minerals, and researchers have recently shown that the effectiveness of traditional minerals, such as bentonite and kaolinite, can be enhanced by altering their natural surface properties to increase their hydrophobicity (Chen et al, ; Lee et al, ; Wang et al, ; Zhang et al, ). Zhang et al () also explored the effectiveness of materials that would not typically be found in a beach environment, such as fly ash and graphite, but had limited success compared to traditional minerals.…”

Section: Formationmentioning

confidence: 99%

Formation, Fate, and Impacts of Microscopic and Macroscopic Oil‐Sediment Residues in Nearshore Marine Environments: A Critical Review

Gustitus

Clement

2017

Reviews of Geophysics

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Crude oil that is spilled in marine environments often interacts with suspended sediments to form residues that can impact the recovery of the affected nearshore ecosystems. When spilled oil and sediment interact, they can form either small microscopic aggregates, commonly referred to as oil‐particle aggregates, or large macroscopic agglomerates, referred to as sediment‐oil agglomerates or sediment‐oil mats. Although these different sized oil‐sediment residues have similar compositions, they are formed under different conditions and have different fates in nearshore environments; the goal of this review is to synthesize our current understanding of these two types of residues. We believe that researchers who focus solely on studying either microscopic aggregates or macroscopic agglomerates could benefit from understanding the research findings available in the other field. In this study, we compare and contrast various processes that control the formation, fate, and impacts of these two types of residues in nearshore environments and point out some of the knowledge gaps in this field. Additionally, these residues have been referred to by many names in the past, leading to confusion and misconceptions at times. In this effort, we recommend a uniform nomenclature to distinguish them based on their physical size. Our overall aim is to bridge the gap between microscopic and macroscopic oil‐sediment residue literature to foster a robust exchange of ideas, which we believe can lead to the development of efficient strategies for managing oil spills that affect nearshore environments.

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“…Several investigations were carried out to understand the various mechanisms involving the formation of aggregates  generally termed Oil Particle Aggregates (OPAs) ,  when oil interacts with suspended particles (including both organic − and inorganic matter , ), whereby it was observed that such aggregation processes are mainly caused by the hydrophobic adsorption between the sediments and the crude oil’s polar compounds (i.e., asphaltenes and resins). − Therefore, crude oils with a relatively high fraction of polar compounds are more inclined to form OPAs, and hydrophobic sediments, such as bentonite and kaolinite, are mostly investigated. ,− …”

Section: Introductionmentioning

confidence: 99%

Post-Formation of Oil Particle Aggregates: Breakup and Biodegradation

Abou-Khalil

Jayalakshmamma

et al. 2023

Environ. Sci. Technol.

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Spilled oil slicks are likely to break into droplets in the subtidal and intertidal zones of seashores due to wave energy. The nonliving suspended fine particles in coastal ecosystems can interact with the dispersed oil droplets, resulting in the formation of Oil Particle Aggregates (OPAs). Many investigations assumed that these aggregates will settle due to the particles’ high density. Recent studies, however, reported that some particles penetrate the oil droplets, which results in further breakup while forming smaller OPAs that remain suspended in the water column. Here, we investigated the interaction of crude oil droplets with intertidal and subtidal sediments, as well as artificial pure kaolinite, in natural seawater. Results showed that the interaction between oil droplets and intertidal sediments was not particularly stable, with an Oil Trapping Efficiency (OTE) < 25%. When using subtidal sediments, OTE reached 56%. With artificial kaolinite, OPA formation and breakup were more significant (OTE reaching up to 67%) and occurred faster (within 12 h). Oil chemistry analysis showed that the biodegradation of oil in seawater (half-life of 485 h) was significantly enhanced with the addition of sediments, with half-lives of 305, 265, and 150 h when adding intertidal sediments, subtidal sediments, and pure kaolinite, respectively. Such results reveal how the sediments’ shape and size affect the various oil–sediment interaction mechanisms, and the subsequent impact on the microbial degradation of petroleum hydrocarbons. Future studies should consider investigating the application of fine (several microns) and sharp (elongated-sheeted) sediments as a nondestructive and nontoxic technique for dispersing marine oil spills.

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Enhanced oil–mineral aggregation with modified bentonite

Cited by 8 publications

References 22 publications

Distribution of Polycyclic Aromatic Hydrocarbons in Sunken Oils in the Presence of Chemical Dispersant and Sediment

Distribution of Polycyclic Aromatic Hydrocarbons in Sunken Oils in the Presence of Chemical Dispersant and Sediment

Formation, Fate, and Impacts of Microscopic and Macroscopic Oil‐Sediment Residues in Nearshore Marine Environments: A Critical Review

Post-Formation of Oil Particle Aggregates: Breakup and Biodegradation

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