Use of geotextiles to regulate flow and reduce pollutant transfer in stormwater management

Use of geotextiles to regulate flow and reduce pollutant transfer in stormwater management

… Download …


Part of #Use of geotextiles to regulate flow and reduce pollutant transfer in stormwater management# :

Publishing year : 2012

Conference : Ninth International Congress of Civil Engineering

Number of pages : 8

Abstract: This paper aims at presenting an ensemble of laboratory studies that were performed in two laboratories of the French Ministry of Public Works. The impact of geotextiles on flow and pollutant transfer (reactive solutes but also colloidal particles) was investigated in the laboratory scale. Leaching column experiments were carried out to proceed with a sequential injection of non-reactive solutes to characterize flow processes, heavy metals as reactive solutes and latex particles as colloids. The transfers were investigated under several types of hydric conditions (saturated versus unsaturated) and through several types of porous media (a calcareous deposit, sandy soil and porous gravel). Numerical modeling has helped to understand the geotextile's effect on flow and pollutant transfer. All results point at the following assumptions. The geotextiles do not directly remove pollutants or colloids. They help in homogenizing flow through cutting preferential pathways. Through their influence on flow, they improve the contact between the pollutants and the reactive matrix and increase the contact time between the particles and the contaminants. They can be considered as a potential tool for the optimization of pollutant removal in stormwater treatment plants