Work

Assessment of the Accumulation Characteristics of Pollutants in the Soil of Permeable Pavement and the Risk of Heavy Metal Pollution Based on the Simulated Rainfall Experiment

Year: 2025

Type: article

Abstract: In this study, aiming to determine the potential pollution risks to the soil foundation caused by permeable pavement after its operation, a fully permeable asphalt pavement system is constructed. Through an accelerated simulation of a three-year cumulative rainfall test, the cumulative characteristics of pollutants in the soil foundation of the permeable asphalt pavement were studied, and a risk assessment of heavy metal pollution was carried out. The results show that N and P pollution is relatively serious. TN and NH4+-N decrease with the increase of the soil foundation depth (0–50 cm), and there is an obvious surface accumulation phenomenon. The average contents at a depth of 0–10 cm are 1219 mg/kg and 443 mg/kg, respectively. The content of TP first shows a decreasing trend and then an increasing one, and it faces the risks of surface accumulation and leaching loss in the middle and lower parts. Although the average contents of Cu, Pb and Zn at different depths all meet the requirements of the Soil Environmental Quality Standard (for agricultural land), they are all higher than the background values of soil elements in Jiangsu Province. Among them, Cu and Zn pose a considerable ecological risk to the environment, especially with serious enrichment in the surface layer. The above cumulative characteristics of pollutants in the fully permeable asphalt pavement provide reference value for extending the service life of the permeable pavement system.

Source: Applied Sciences

DOI: 10.3390/app152111369