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Biofouling, particle morphology, and exposure reshape the threshold of microplastic incipient motion
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Scientists found that when microplastics develop a slimy layer of bacteria and algae (called biofilm) in rivers and oceans, it changes how easily they get swept up and moved by water currents—similar to how a rougher surface affects grip. This matters because understanding where microplastics travel and settle helps researchers predict where these pollutants build up in waterways, which is a key step in figuring out how they might eventually reach our food and water supplies.
Microplastics (MPs) are pervasive pollutants in aquatic environments, and understanding their transport dynamics is critical for assessing environmental risks. This study represents a pioneering analysis of the threshold of MP incipient motion. By conceptualizing biofilm as an enhancement of surface roughness, we find that biofilm influences the incipient motion of MPs by altering the coefficient of static friction (μ).The dependence of the μ on the biofilm thickness is formulated empirically, and the associated increase in the critical Shields number (θ) for MPs is then determined. Furthermore, factors affecting the θ of MPs, such as particle shape, size, biofilm on the surface, and exposure conditions are systematically integrated into a semi-theoretical model by 45 incipient motion experiments and data extracted from published literature. The theoretical component is grounded in force balance analysis, while model coefficients are empirically calibrated using experimental results. Comparison with existing empirical models demonstrates that the proposed framework offers improved robustness and predictive capability for assessing the incipient motion of biofouled MPs.
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Shifting settling regimes of aquatic microplastics
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Researchers conducted laboratory settling experiments and modeling to understand how physical properties of microplastics influence their settling velocity and transport behavior in aquatic environments. They found that biofilm colonization significantly increases settling rates, suggesting that biofouling is a key factor controlling microplastic fate and distribution in rivers and lakes.
Impact of Biofilm Formation on Microplastic Behaviour in Aquatic Environments: An Comprehensive Review.
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This review examines how biofilms — communities of microorganisms that coat microplastics — change the behavior of plastic particles in aquatic environments, affecting how they move, sink, and interact with ecosystems. Understanding biofilm formation on microplastics is key to predicting where these particles end up and what risks they pose to water quality and aquatic life.
BIOPHYLM: Biofilm on microplastics - a biophysical perspective
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Scientists are studying how bacteria grow on tiny plastic particles (microplastics) in rivers and lakes, creating slimy coatings called biofilms. These biofilms change how the plastic pieces move through water and may affect whether they become more or less harmful to wildlife and potentially humans. Understanding this process will help researchers better assess the health risks of plastic pollution in our water systems.
Impacts of Biofilm Formation on the Fate and Potential Effects of Microplastic in the Aquatic Environment
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Researchers reviewed how biofilm formation on microplastic surfaces affects the fate and potential ecological effects of microplastics in aquatic environments, finding that biofilms alter particle buoyancy, surface chemistry, and interactions with organisms.
Biofilm on microplastics in aqueous environment: Physicochemical properties and environmental implications
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This review examines how bacteria and other microorganisms form sticky films called biofilms on microplastic surfaces in water. These biofilms change how microplastics move through the environment and increase their ability to absorb pollutants like heavy metals, pesticides, and antibiotics. Biofilm-coated microplastics may also carry harmful bacteria, making them a greater potential health risk than clean microplastic particles.
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