微塑料圆盘在水中的沉降行为。
Settling behaviors of microplastic disks in water.
作者信息
Yang Ge, Yu Zijian, Baki Abul B M, Yao Weiwei, Ross Matthew, Chi Wanqing, Zhang Wenming
机构信息
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699, USA.
出版信息
Mar Pollut Bull. 2023 Mar;188:114657. doi: 10.1016/j.marpolbul.2023.114657. Epub 2023 Feb 1.
Microplastic (MP) disks have not been studied for settling behaviors in aquatic environments, which affects the transport and fate of MPs. Therefore, settling experiments were conducted on MP disks of three shapes and four common-seen materials. Lighter MP disks (with density ρ = 1.038 g/cm and length l ≤ 5 mm) followed rectilinear vertical trajectories, while heavier MP disks (ρ = 1.161-1.343 g/cm and l = 5 mm) followed zigzag trajectories with oscillations and rotations. The mean terminal settling velocities of MP disks were 19.6-48.8 mm/s. Instantaneous settling velocities of heavier MP disks fluctuated. Existing formulas could not accurately predict the settling velocity of MP disks; thus, a new model was proposed with an error of 15.5 %. Finally, the Re - I* diagram (Re is the disk Reynolds number and I* is the dimensionless moment of inertia) was extended for MP disks to predict settling trajectories.
微塑料（MP）圆盘在水生环境中的沉降行为尚未得到研究，而这会影响微塑料的迁移和归宿。因此，对三种形状和四种常见材料的微塑料圆盘进行了沉降实验。较轻的微塑料圆盘（密度ρ = 1.038 g/cm且长度l≤5 mm）沿直线垂直轨迹沉降，而较重的微塑料圆盘（ρ = 1.161 - 1.343 g/cm且l = 5 mm）则沿带有振荡和旋转的锯齿形轨迹沉降。微塑料圆盘的平均终端沉降速度为19.6 - 48.8 mm/s。较重微塑料圆盘的瞬时沉降速度波动较大。现有公式无法准确预测微塑料圆盘的沉降速度；因此，提出了一个误差为15.5%的新模型。最后，将Re - I图（Re为圆盘雷诺数，I为无量纲惯性矩）扩展用于微塑料圆盘以预测沉降轨迹。
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