Gas capture and extraction using multi-linear drainage géocomposite

The design of gas drainage systems is essential for mitigating environmental impacts, especially in contaminated soils (e.g., hydrocarbons, radon) and landfill covers (e.g., methane and carbon dioxide management). This study experimentally investigates the gas drainage capacity and transport through mini pipes within multi-linear drainage geocomposites, as these mini pipes primarily determine the system’s overall drainage capacity. Initially, the assessment of the discharge capacities was performed on air, and CO₂ through various mini-pipe diameters and lengths to characterize the flow rate as a function of the gradient. Finally, the drainage capacity through mini-tube connections and their integration into the principal collection system was examined. These two steps enable the estimation of both linear and singular head losses, considering the extended lengths of the mini-pipes and their connections. The final objective is to extend these findings to gases such as methane and radon by establishing discharge equivalencies among various fluids. This experimentation is supported by well-known fluid transport concepts, allowing for the modeling and reproduction of the drained flow rate as a function of the fluid gradient. This paper presents the methodology and results of the proposed study, along with various analyses of equivalency considerations to enhance gas drainage system design.