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The role of biofilm and hydrodynamics on the fate of microplastic particles in rivers: an experimental study
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Researchers conducted flume and field experiments to examine how biofilm formation and hydrodynamic conditions govern the fate of microplastic particles in rivers, investigating why some MP-polluted rivers crossing industrialized areas show no significant upstream-to-downstream concentration differences. The study identified biofilm-mediated density changes and turbulence as key factors controlling whether low-density MPs remain suspended or settle into sediments.
The transfer of microplastics particles (MP) from densely populated and industrialised areas to watercourses is particularly important but, some rivers crossing these types of territories present no significant MP concentration difference between upstream and downstream. At the same time low-density MP is found in the sediments. In general, three key parameters are hypothesized as governing the MP fate in aquatic environments: particle characteristics, interactions with biota, and hydrodynamics. The role of these parameters together on the dynamics of this MP dynamics in running water systems is yet to be explored to better estimate the temporality of MP displacement and its fate. In an experimental approach, we integrated the water column and sediment compartments, exploring the role of turbulence and biofilm on low-density MP dynamics. In a flume containing sediment and biofilm on it, the trajectory of standard particles of polyethylene polymer ( 50 µm) were followed at different flow velocities. A Particle Image Velocimeter setup followed by data processing using Particle Tracking Velocimetry allowed to retrace the trajectory of the particles near the sediment indicating their fate. We observed that increasing turbulence led to higher relative numbers of MP being in contact with the biofilm from 4 Also see: https://micro2024.sciencesconf.org/559204/document
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The role of biofilm and hydrodynamics on the fate of microplastic particles in rivers: an experimental study
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Researchers conducted experimental flume studies to investigate how biofilm formation and hydrodynamic conditions jointly govern microplastic particle fate in rivers, examining why some urbanized and industrialized river reaches show no significant upstream-to-downstream increase in microplastic concentration despite theoretical inputs.
Understanding the role of turbulence and biofilm on low density microplastic dynamics: An experimental approach towards natural conditions
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Flume experiments showed that turbulence in rivers significantly increases the frequency with which buoyant low-density microplastics come into contact with bacterial biofilms on the riverbed — and that this biofilm contact, while capturing only a small percentage of passing particles, helps explain why lightweight plastics are consistently found buried in river sediments despite their tendency to float. The study reveals a two-step process: turbulence drives plastics toward the riverbed, and biofilm properties then control how many stick. This has implications for predicting where microplastics accumulate and how they move through freshwater systems.
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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.
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