Department of Environmental Science and Engineering, School of Energy and Environment, Anhui University of Technology, Maanshan 243002, China.
Department of Environmental Science and Engineering, School of Energy and Environment, Anhui University of Technology, Maanshan 243002, China.
Sci Total Environ. 2023 Apr 10;868:161673. doi: 10.1016/j.scitotenv.2023.161673. Epub 2023 Jan 17.
The sink of microplastics (MPs) in sediments of urban rainwater drainage system (RDS) is of great concern, because the MPs deposited can be resuspended by flow disturbance. Previous research has confirmed the significant accumulation of MPs in sediments of urban RDS, but it remains poorly elucidated, such as pollution sources and influencing factors. In this study, we investigated the MPs in sediments from RDS of a university campus. MPs were detected from all sediment samples, showing the ubiquity of microplastic pollution. Among 11 samples MPs' abundance ranged from 80 to 2610 particles/kg (dry weight), with highly spatial variability, depending on land type and environmental management practice within the catchment. Sites from office & teaching area had the averaged abundance of 335.00 ± 196.85 particles/kg, while 270.00 ± 89.09 particles/kg for staff residential area, and 795.00 ± 1050.65 particles/kg for student living area, indicating that the sediments of RDS from student living area had the highest abundance of MPs. However, independent sample t-test analysis suggests there is no statistically significant difference between land types, because of effective environmental management practices in the catchment. The surfaces of MPs were much rough, which implies that the fragmentation of larger plastic particles resulted in the production of MPs. Although the MPs of <1000 μm were the most, 1000-2000 μm MPs also accounted for a significant proportion in this study, showing a slight difference from the previous study in which MPs over 1 mm were quite low. Polypropylene (PP) and polyester (PET) found to be dominant with 49.75 ± 18.69 % and 49.75 ± 18.69 % of the total number, respectively. As to shapes, the proportion of fiber and fragment MPs exceeded 80 %. The color of MPs diversified greatly, and the MPs with bright colors occupied over 80 %. Fabric fibers, food packaging and courier packaging materials were figured out to be the considerable contributors of MPs.
城市雨水排水系统 (RDS) 沉积物中微塑料 (MPs) 的汇是一个值得关注的问题，因为受水流干扰，沉积的 MPs 可能会重新悬浮。先前的研究已经证实了城市 RDS 沉积物中 MPs 的大量积累，但仍不清楚其污染来源和影响因素。在这项研究中，我们调查了大学校园雨水排水系统沉积物中的 MPs。所有沉积物样本中均检测到 MPs，表明微塑料污染普遍存在。在 11 个样本中，MPs 的丰度范围为 80 至 2610 个/千克（干重），具有高度的空间变异性，这取决于集水区内的土地类型和环境管理实践。来自办公和教学区的样本平均丰度为 335.00 ± 196.85 个/千克，而来自员工住宅区的样本为 270.00 ± 89.09 个/千克，来自学生生活区的样本为 795.00 ± 1050.65 个/千克，这表明学生生活区雨水排水系统的沉积物中 MPs 的丰度最高。然而，独立样本 t 检验分析表明，由于集水区内有效的环境管理实践，不同土地类型之间没有统计学上的显著差异。MPs 的表面非常粗糙，这意味着较大塑料颗粒的破碎导致了 MPs 的产生。尽管 <1000 μm 的 MPs 最多，但在这项研究中，1000-2000 μm 的 MPs 也占了相当大的比例，与之前研究中 MPs 超过 1mm 的比例相当低的情况略有不同。聚丙烯 (PP) 和聚酯 (PET) 分别以 49.75 ± 18.69 %和 49.75 ± 18.69 %的总数占主导地位。至于形状，纤维和碎片 MPs 的比例超过 80 %。MPs 的颜色多种多样，颜色鲜艳的 MPs 占比超过 80 %。织物纤维、食品包装和快递包装材料被认为是 MPs 的主要来源。
