Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden; Environment and Health Administration, City of Stockholm, Fleminggatan 4, Box 8136, Stockholm SE-104 20, Sweden.
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden E-mail:
Water Sci Technol. 2024 Nov;90(10):2857-2869. doi: 10.2166/wst.2024.368. Epub 2024 Nov 8.
Stormwater is recognised as a vector for microplastics (MPs), including tyre wear particles (TWPs) from land-based sources to receiving waterbodies. Before reaching the waterbodies, the stormwater may be treated. In this study, sediments from six treatment facilities (five retention ponds and a subsurface sedimentation tank) were analysed to understand MP occurrence, concentrations, sizes, polymer types and distribution between inlet and outlet. The concentrations of MPs showed large variations between and within different facilities with MP concentrations of 1,440-72,209 items/kg (analysed by μFTIR) corresponding to 120-2,950 μg/kg and TWP concentrations from <DL up to 69,300 μg/kg (analysed by pyrolysis-GC-MS), with significantly higher concentrations at the inlet compared to the outlet. Polypropylene (PP) was the predominant MP type in terms of number in all samples. TWPs were dominant by mass in most (nine) samples. The relatively low density of PP polymers implies that density might not be the sole factor influencing particle settlement behaviour. Small particles occurred more frequently than large ones; around 70% of the particles detected in the samples were 100 μm or smaller. In summary, this study highlights the occurrence of MPs, including TWPs, in stormwater facilities and demonstrates variations in concentrations depending on sites and locations within the facility.
雨水被认为是微塑料（MPs）的载体，包括来自陆地源的轮胎磨损颗粒（TWP）进入受纳水体。在到达水体之前，雨水可能会经过处理。在这项研究中，对六个处理设施（五个滞留池和一个地下沉淀罐）的沉积物进行了分析，以了解 MPs 的出现、浓度、大小、聚合物类型以及在入口和出口之间的分布情况。MPs 的浓度在不同设施之间和内部存在很大差异，用 μFTIR 分析的 MPs 浓度为 1440-72209 个/千克（对应 120-2950μg/kg），TWP 浓度从<DL 到 69300μg/kg（用热解-GC-MS 分析），入口处的浓度明显高于出口处。就数量而言，在所有样品中，聚丙烯（PP）是主要的 MP 类型。在大多数（九个）样品中，TWP 以质量为主导。PP 聚合物的相对低密度意味着密度可能不是影响颗粒沉降行为的唯一因素。小颗粒比大颗粒更频繁地出现；在样品中检测到的颗粒中，约有 70%的颗粒在 100μm 或更小。总的来说，这项研究强调了 MPs（包括 TWP）在雨水处理设施中的存在，并表明了浓度的变化取决于地点和设施内的位置。
