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Enhanced Microplastic Flotation: Unraveling the Role of Bubble-Chain Hydrodynamics Via Piv Analysis
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Researchers used particle image velocimetry to show that increasing the number of bubbles in a bubble-chain flotation system creates overlapping vortices that expand the hydrodynamic field, boosting microplastic removal efficiency by up to 48.7% — providing a quantitative basis for improving dissolved air flotation treatment technologies.
) increased from 5.58 to 8.31 and 4.78 to 6.52, showing maximum increases of 44.8% and 48.7%, respectively. As the number of bubbles increased, the axial motion of the particles was significantly enhanced, which was attributed to the vertical expansion of the flow field, the increase in vorticity, and the formation of asymmetric flow structures as identified through particle image velocimetry (PIV) analysis. The formation of overlapping vortices within bubble-chain systems substantially broadens the effective hydrodynamic field, facilitating improved flotation of microplastic particles. This extended flow structure provides a quantifiable framework for enhancing the efficiency of dissolved air flotation (DAF) technologies, particularly in applications targeting microplastic separation.
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Researchers developed and tested a microbubble flotation system enhanced with surfactants that achieved high removal efficiency of microplastics from wastewater by exploiting differences in particle surface hydrophobicity and bubble attachment. Because conventional wastewater treatment plants allow significant quantities of microplastics to pass through into receiving waterways, innovative physical separation methods like microbubble flotation are critical for reducing the volume entering aquatic environments and, ultimately, the food supply.
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Numerical investigation of microplastic settling and rising behavior in water reveals how particle shape, density, and size influence their hydrodynamic trajectories and ultimate fate in aquatic systems. These computational findings improve our ability to model microplastic transport and deposition, which is fundamental to understanding where particles accumulate and which organisms are most exposed.
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Using numerical hydrodynamic modeling, researchers investigated how microplastics of varying shapes, densities, and sizes settle and rise through aquatic environments, revealing complex transport behaviors that differ substantially from natural particles. Understanding these movement dynamics is essential for predicting where microplastics accumulate in water bodies, informing risk assessments for aquatic organisms and the design of effective removal strategies.
Microplastic Particle Behavior in Turbulent Flows: Insights from Experimental Investigations
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Advances in microbubble-based separation technologies for microplastics removal from water
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Tiny plastic bits (microplastics) are turning up in our water supplies, and scientists are testing ways to filter them out before they reach our taps. This review looks at one promising method, using ultra-fine bubbles that stick to plastic particles and float them to the surface for removal, which has removed 75 to 95% of microplastics in lab studies. While the technology shows real promise as an affordable, scalable way to clean water, researchers note it still needs refinement before widespread use, especially for smaller or aged plastic particles that behave less predictably.
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