Abundance, composition and fluxes of plastic debris and other macrolitter in urban runoff in a suburban catchment of Greater Paris

Robin Treilles (1) , Johnny Gasperi (2, 1) , Saad Mohamed (1) , Romain Tramoy (1) , Jérôme Breton (3) , Alain Rabier (3) , Bruno Tassin (1)

1 LEESU - Laboratoire Eau Environnement et Systèmes Urbains
2 GERS-LEE - Eau et Environnement
3 DSEA - Direction des Services de l'Environnement et de l'Assainissement

Stormwater possibly represents a significant input for plastic debris in the environment; however, the quantification and composition of plastic debris and other macrolitter in stormwater are not available in literature and the amounts discharged into freshwater have been poorly investigated. To obtain a better understanding, the occurrence, abundance, and composition of the macrolitter in screened materials from stormwater were investigated at a small residential suburban catchment (Sucy-en-Brie, France) in Greater Paris. The macrolitter, particularly the plastic debris, was sorted, weighed, and classified based on the OSPAR methodology. On average, plastics accounted for at least 62% in number and for 53% of the mass of all the anthropogenic waste found in the screened materials. The most common items were plastic bags or films, crisp or sweet packets, cigarette butts, plastic fragments of unknown origin, garbage bags or garbage bag strings, foil wrappers, tampon applicators, plastic cups, and medical items such as bandages. Plastic debris concentrations in runoff water ranged between 7 and 134 mg/m3 (i.e. 0.4–1.7 kg.yr−1.ha−1 or 4.8–18.8 g.yr−1.cap−1). When extrapolated to the Greater Paris area, the estimated amount of plastic debris discarded into the environment through untreated stormwater of separate sewer systems ranges from 8 to 33 tons.yr−1.

Domaines: Sciences de l'environnement

Robin Treilles, Johnny Gasperi, Saad Mohamed, Romain Tramoy, Jérôme Breton, et al.. Abundance, composition and fluxes of plastic debris and other macrolitter in urban runoff in a suburban catchment of Greater Paris. Water Research, 2021, 192, pp.116847. ⟨10.1016/j.watres.2021.116847⟩. ⟨hal-03113127⟩