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

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 wh...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-04, Vol.29 (20), p.30496-30506
Main Authors: Li, Wenxin, Yu, Yue, Xiong, Deqi, Qi, Zhixin, Fu, Sinan, Yu, Xinping
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Crude oil
Dispersants
Droplets
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Hydrophobicity
Kaolin
Ocean floor
Oil spills
Petroleum
Petroleum Pollution - analysis
Research Article
Seawater
Surface Properties
Surface tension
Surface-Active Agents - chemistry
Viscosity
Waste Water Technology
Water circulation
Water column
Water Management
Water Pollutants, Chemical - analysis
Water Pollution Control
Wave tanks
Zeta potential
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Summary: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 ( 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 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.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-021-17746-2