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61,005 resultsShowing papers similar to Aggregation characterization and mechanism of microplastics and suspended sand in the Three Gorges Reservoir
ClearTurbulence-sediment synergy controls buoyant microplastic settling in the three gorges reservoir
Laboratory experiments showed that turbulence and sediment concentration interact synergistically to control the settling and resuspension of buoyant microplastics in water. Understanding these coupled dynamics is essential for modeling microplastic transport and deposition in rivers and coastal zones.
Experimental study on parameterizing microplastic-sediment aggregation
Researchers conducted laboratory flocculation experiments to parameterize microplastic-sediment aggregation, testing fibers, fragments, and spheres of varying sizes and densities to characterize how microplastics and sediment form flocs with enhanced settling velocity, with the goal of improving numerical transport models of microplastic fate in rivers and estuaries.
Influence of catastrophic flood on microplastics organization in surface water of the Three Gorges Reservoir, China
Microplastic distribution in the Three Gorges Reservoir was analyzed before and after a catastrophic 2020 flood, finding that the flood altered microplastic organization, stability, and polymer composition throughout the reservoir, with implications for microplastic transport to the global ocean.
Role of biophysical flocculation on microplastics and sediment interactions in a microtidal estuary
Field surveys and lab experiments in a microtidal estuary found that microplastics flocculate with negatively charged clastic sediment through biophysical processes, influencing how microplastics are transported, aggregated, and deposited in estuarine environments.
Rapid flocculation and settling of positively buoyant microplastic and fine-grained sediment in natural seawater
Laboratory experiments showed that positively buoyant microplastics rapidly flocculated with fine-grained sediment in natural seawater, causing particles that would otherwise float to sink quickly. The finding has important implications for predicting microplastic fate in estuaries, where plastic-sediment aggregates may settle to the seafloor rather than dispersing.
Sedimentation behavior of aggregated microplastics: Influence of particle size and water constituents in environmental waters
Laboratory experiments investigated how aggregation of microplastics with sediments and organic matter affects their sinking rates in water, finding that aggregate composition strongly influences settling velocity. These findings improve models predicting whether microplastics sink to the seafloor or remain suspended in the water column.
How do microplastics interact with other particles in aquatic environments?
This study investigates how microplastics interact with other particles in aquatic environments, examining the physical and chemical mechanisms governing aggregation, adsorption, and co-transport of microplastics with suspended particles. The research is hosted on the Experiment platform for open scientific discovery funding and sharing.
Flocculation and its impact on microplastic transport mechanisms in rivers
Researchers used rotating wheel laboratory experiments to investigate microplastic-sediment flocculation mechanisms in rivers, finding that fine cohesive sediments adhere to MP particles to form aggregates that modify transport behaviour and enhance deposition, contributing to MP accumulation in riverine sedimentary deposits.
Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
Researchers investigated heteroaggregation between polystyrene microplastics and ferrihydrite iron mineral particles, finding that this aggregation process leads to rapid removal of microplastic particles from the water column, with implications for understanding microplastic fate and transport in natural water systems.
Occurrence and Characteristics of Microplastic Pollution in Xiangxi Bay of Three Gorges Reservoir, China
Researchers surveyed Xiangxi Bay in the Three Gorges Reservoir and characterized microplastic occurrence and distribution, finding contamination throughout the bay with patterns influenced by local water circulation and sediment dynamics.
Preferential deposition of buoyant small microplastics in surface sediments of the Three Gorges Reservoir, China: Insights from biomineralization
This study examined the distribution of buoyant small microplastics in surface sediments of the Three Gorges Reservoir, finding preferential deposition patterns at the sediment-water interface. The research revealed that reservoir hydrodynamics and sediment characteristics drive accumulation of buoyant microplastics in specific zones.
Interactions between nano/micro plastics and suspended sediment in water: Implications on aggregation and settling
Interactions between nanoplastics and suspended sediment were studied in NaCl solutions, finding that large sediment particles significantly enhanced settling of nanoplastics through heteroaggregation, with the effect increasing at higher ionic strength. The study reveals how sediment-nanoplastic aggregation drives vertical transport and burial of nanoplastics in aquatic environments.
Microplastics in surface waters and sediments of the Three Gorges Reservoir, China
Researchers sampled surface waters and sediments of the Three Gorges Reservoir in China and found microplastic contamination throughout, with concentrations influenced by water flow dynamics and proximity to human settlements.
Effects of size and surface charge on the sedimentation of nanoplastics in freshwater
Researchers investigated how size and surface charge of polystyrene nanoplastics affect their sedimentation behavior in freshwater, finding that both properties significantly influence aggregation dynamics and settling rates, with implications for predicting nanoplastic fate in aquatic environments.
Aggregation Behavior of Particulate Plastics and Its Implications
This chapter reviews how microplastics aggregate with each other and with natural particles like sediment and algae in water, affecting their transport, fate, and biological availability. Heteroaggregation with natural colloids is more common than microplastic-to-microplastic clumping, which has important implications for how microplastics move through aquatic environments.
Flocculation of PVC Microplastic and Fine-Grained Cohesive Sediment at Environmentally Realistic Concentrations
Laboratory flocculation experiments showed that PVC microplastics form aggregates with fine cohesive sediment at environmentally realistic concentrations, with aggregate size and settling velocity influenced by salinity and mixing energy, affecting microplastic transport in estuarine environments.
Migration behaviors of microplastics in sediment-bearing turbulence: Aggregation, settlement, and resuspension
This study explored how turbulent shear flow affects microplastic aggregation with suspended sediment and the resulting vertical migration behavior. Smaller microplastics aggregated more readily with sediment particles, dramatically increasing their settlement rate and potentially causing secondary pollution when bottom sediments are resuspended by turbulence.
Both nanoplastic and iron mineral types determine their heteroaggregation: Aggregation kinetics and interface process
Researchers measured how four types of nanoplastics aggregate with iron minerals and found that surface chemistry drives the outcome — with PMMA forming the strongest heteroaggregates and carboxyl-modified particles the weakest — and that electron transfer from nanoplastics to hematite partially reduces iron, with implications for aquatic iron cycling.
Heteroaggregation of nanoplastic particles in the presence of inorganic colloids and natural organic matter
Nanoplastics were found to heteroaggregate extensively with inorganic colloids and natural organic matter in both freshwater and marine conditions, altering their size, surface charge, and settling behavior compared to pristine particles. The study demonstrates that nanoplastic behavior in natural waters is dominated by interactions with other environmental constituents rather than the intrinsic properties of the plastic alone.
Sediment organic carbon dominates the heteroaggregation of suspended sediment and nanoplastics in natural and surfactant-polluted aquatic environments
Researchers found that sediment organic carbon plays a dominant role in the heteroaggregation of nanoplastics with suspended sediment particles, with surfactant pollution altering aggregation dynamics and influencing the environmental transport and fate of nanoplastics in aquatic systems.
Influence of typical clay minerals on aggregation and settling of pristine and aged polyethylene microplastics
Researchers investigated how common clay minerals affect the aggregation and settling behavior of pristine and aged polyethylene microplastics in water. They found that high salt concentrations promoted the settling of microplastics when clay minerals were present, and that electrostatic repulsion was the dominant force governing interactions between plastics and clay particles. The findings provide new insights into how microplastics are transported and deposited in natural water systems.
Aggregation behavior of polyethylene microplastics in the nearshore environment: The role of particle size, environmental condition and turbulent flow
Researchers investigated how particle size, salinity, dissolved organic matter, and turbulent flow affect the aggregation behavior of polyethylene microplastics in nearshore water, finding that all factors influenced aggregation rates and aggregate structure. Understanding microplastic aggregation in estuarine environments is essential for predicting their sedimentation and biological uptake.
Heterogeneous aggregation of microplastics and mineral particles in aquatic environments: Effects of surface functional groups, pH, and electrolytes
Researchers studied how microplastics clump together with soil and rock minerals in water, finding that positively charged minerals bound to plastic particles nearly three times more effectively than clay minerals, and that low pH and calcium ions dramatically accelerated aggregation. Understanding these dynamics helps predict where microplastics will settle or stay suspended in rivers, lakes, and aquifers.
Impact of coagulation characteristics on the aggregation of microplastics in upper-ocean turbulence
This study investigated how coagulation conditions affect microplastic aggregation in water treatment, finding that coagulant type and dose significantly influence floc formation with plastic particles and ultimately removal efficiency.