Ledieu Lauriane, Tramoy Romain, Mabilais David, Ricordel Sophie, Bridant Zoé, Bouchet Eric, Bruttin Clémence, Tassin Bruno, Gasperi Johnny
Univ Gustave Eiffel, GERS-LEE, F-44344, Bouguenais, France.
Institut de Recherche en Sciences et Techniques de la Ville IRSTV, CNRS, 1 rue de la Noë, 44321, Nantes, France.
Environ Sci Pollut Res Int. 2025 Apr;32(16):10135-10148. doi: 10.1007/s11356-024-35203-8. Epub 2024 Oct 13.
Urban areas concentrate on human activities that generate large amounts of waste. A small fraction is mismanaged and ends up on urban surfaces and eventually in waterways. The fraction reaching waterways is usually estimated using poorly constrained data, while litter density on urban surfaces and its subsequent transfer dynamics are also poorly documented. This study provides new insights into litter composition, sources, and spatio-temporal variations in the urban catchments of Pin Sec and Jules Verne (Nantes, France), which are dominated by industrial/commercial, collective, and individual housing areas. Regular litter collection on selected street sections was combined with visual counting of street litter (> 1 cm). In total, 50.8 kg (dry weight) of litter were collected and 232,217 items were counted, mainly smoking and food consumption-related items. Litter densities ranged between 40,000 and 452,000 items/km depending on local activities, item mobility, and land use as a driver of road and foot traffic. A median litter accumulation rate of 7 g/inhabitant/day was estimated, suggesting that 0.6% of the total amount of waste generated in public places is mismanaged. Results over space show that litter is strongly correlated with land use and that litter accumulation is promoted in green spaces. Results over time show that litter stock is quickly renewed and that items may have long residence time on urban surfaces.
城市地区集中了大量产生废弃物的人类活动。一小部分废弃物管理不善，最终出现在城市地面上，并最终进入水道。通常使用约束性较差的数据来估算进入水道的废弃物比例，而城市地面上的垃圾密度及其后续转移动态也鲜有记录。本研究对法国南特市平塞克和儒勒·凡尔纳城市集水区的垃圾成分、来源及时空变化提供了新的见解，这些集水区主要由工业/商业区、集体住宅区和个人住宅区组成。在选定的街道段定期收集垃圾，并对街道上大于1厘米的垃圾进行目视计数。总共收集了50.8千克（干重）垃圾，计数了232,217件物品，主要是与吸烟和食品消费相关的物品。根据当地活动、物品流动性以及作为道路和行人交通驱动因素的土地利用情况，垃圾密度在40,000至452,000件/公里之间。估计垃圾积累率中位数为7克/居民/天，这表明公共场所产生的垃圾总量中有0.6%管理不善。空间结果表明，垃圾与土地利用密切相关，绿地中垃圾积累更为明显。时间结果表明，垃圾存量更新迅速，物品在城市地面上可能停留较长时间。
