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- Title
Microplastic accumulation in sewer sediments and its potential entering the environment via combined sewer overflows: a study case in Paris.
- Authors
Nguyen, Minh Trang; Phuong, Ngoc Nam; Saad, Mohamed; Tassin, Bruno; Gillet, Thomas; Guérin-Rechdaoui, Sabrina; Azimi, Sam; Rocher, Vincent; Gasperi, Johnny; Dris, Rachid
- Abstract
During wet weather events, combined sewer overflows (CSOs) transfer large amount of particulate matter and associated pollutants into surrounding water bodies, thereby deteriorating the recipients' ecological health. Resuspension of sewer sediments during these events contributes significantly to pollution level of these discharges. However, how much this in-sewer process contributes to CSOs' quality regarding microplastic (MP) pollution is little known. Therefore, an investigation on sewer deposits inside the Parisian combined sewer network was carried out. The study found high MP concentrations stored in this matrix, ranging from 5 × 103 to 178 × 103 particle/kg dry weight. Polymer composition is similar to what found in raw wastewater, containing a high proportion of polyethylene and polypropylene. Thus, the results indicated the persistence of MPs in sewer network during transport during dry weather periods to treatment facilities. Once resuspension of sewer deposits happens, MPs can be released into water flow and get discharged along with CSOs. This highlights another potential pathway of MPs into freshwater environment.
- Subjects
PARIS (France); SEWERAGE; COMBINED sewer overflows; ENVIRONMENTAL health; PARTICULATE matter; SEDIMENTS; WATER pollution; BODIES of water
- Publication
Environmental Science & Pollution Research, 2024, Vol 31, Issue 7, p10501
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-023-31734-8