Analysis and study of the migration pattern of microplastic particles insaturated porous media pavement br

作者：Liu, Sheng; Wu, Jiayan; Sun, Leiye; Huang, Minye; Qiu, Xiaoshan; Tang, Hongmei; Liu, Jieyu; Wu, Pingxiao^*

来源：Science of the Total Environment, 2023, 861: 160613.

DOI：10.1016/j.scitotenv.2022.160613

• Pavement runoff
• Microplastic particles
• Saturated porous media
• Migration law
• Separation effect

This work aims to establish an analytical and comparative model of pavement stormwater runoff and determine howto solve water pollution in saturated porous media pavements. Heavy metal element particles in the stormwater runoffdue to the rainfall will cause inevitable environmental pollution. First, the pavement runoff and materials of saturatedporous media are analyzed. Besides, particle migration laws and separation effects of different materials are compared.Based on this, microplastics are selected as the primary material for pavementfilling. Then, the adsorption effect ofmicroplastics and the parameters of rainwater infiltration rate and infiltration ratio are analyzed to propose a multi-level ecological integrated treatment system for pavement runoff. Specifically, the environmental resource pollutionand saturated porous media materials are analyzed. In addition, the adsorption effect of microplastic particles is ana-lyzed to establish a model to study the selection process of the optimal adsorption material. The main contribution ofthe research is to analyze the migration process of metal particles in the soil in combination with the internal particlemigration rules of plastic granular materials. The research results demonstrate that the rain runoff coefficient graduallyincreases with the expansion of the permeable area of the pavement. The rain runoff coefficient reaches the maximumvalue under the pavement of 120 square meters. In addition, a comparative analysis of three street pavements is con-ducted on the residential street pavement (RSP), commercial street pavement (CSP), and active street pavement (ASP).When comparing the two sets of data, the overall average permeability of the RSP is better than CSP and ASP. Theresearch materials are compared under isothermal conditions. The particle adsorption effect of the same material at50 degrees C is significantly better than that at 30 degrees C. Therefore, it is feasible to resolve the pavement runoff water pollutionthrough technical schemes.