3D analysis of microplastic settling in algal suspensions

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Pollution Pub Date : 2024-09-03 DOI:10.1016/j.envpol.2024.124883

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Abstract

The influence of algae presence in surface water on the settling velocities of microplastics is unknown, and determining it is challenging due to the turbidity of algal suspensions. Measuring the settling velocity of microplastics has traditionally relied on either manual measurement techniques or 2D Particle Tracking Velocimetry (PTV). This study introduces a 3D-PTV method tailored to determine the effects of algae (Synechoccocussp.) on microplastic settling speeds in semi-large columns. We demonstrated that 3D PTV produces much more accurate results than 2D particle tracking. Testing the method in six experiments with varying algae concentrations revealed consistent results across the experiments and alignment with some theoretical approximations. The results were concurrent with calculated 2D speeds. No influence of algal density on settling velocities was found, which is highly relevant for microplastic fate modeling in eutrophic systems. We highlight the applicability and accuracy of 3D particle tracking velocimetry in further understanding microplastic settling behavior.

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藻类悬浮液中微塑料沉降的三维分析。

地表水中藻类的存在对微塑料沉降速度的影响尚不清楚，而且由于藻类悬浮物的浑浊度，要确定其沉降速度也很困难。测量微塑料的沉降速度历来依赖于人工测量技术或二维粒子跟踪测速仪（PTV）。本研究介绍了一种三维 PTV 方法，专门用于确定藻类（Synechoccocus sp.）对半大型水柱中微塑料沉降速度的影响。我们证明了三维 PTV 比二维粒子跟踪能得出更精确的结果。在不同藻类浓度的六次实验中对该方法进行了测试，结果显示各次实验的结果一致，并与一些理论近似值相吻合。结果与计算出的二维速度一致。没有发现藻类密度对沉降速度的影响，这与富营养化系统中微塑料归宿建模高度相关。我们强调了三维粒子跟踪测速仪在进一步了解微塑料沉降行为方面的适用性和准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.