Author(s): Eduardo Garcia-Haba; Juan Naves; Carmen Hernandez-Crespo; Angelica Goya-Heredia; Joaquin Suarez; Jose Anta; Ignacio Andres-Domenech
Linked Author(s): Jose Anta Álvarez, Juan Naves García-Rendueles, Ignacio Andrés Doménech
Keywords: No Keywords
Abstract: Permeable pavements (PP) are effective sustainable urban drainage solutions to manage and treat stormwater. Several significant fears associated with the use of this technology relate mainly to clogging problems. These concerns notably encompass its hydraulic efficiency and its capacity to enhance water quality. The properties of sediments transported by urban runoff onto permeable pavements exert a significant influence on the clogging process. This, in turn, impacts both the hydrological performance and the efficiency of pollutant elimination. Laboratory experiments simulated and analyzed the response of permeable asphalt under different sediment loading conditions. Six different sediment classes were applied to permeable asphalt slabs in two laboratory rainfall simulators. Different hydraulic variables were measured, including permeability, filtered water volumes and runoff. Also, effluent water quality parameters and treatment efficiencies were determined. Sediment surface loads of 1 kg/m2 or more caused significant reductions in permeability (22–99 %), except for very fine sediments (<125 μm) (1%). Sediment with higher content of organic matter reduce infiltration ratios and increase runoff flows and volumes. Permeability recovery after vacuum cleaning varied between 8 - 100% of original permeability. The rainfall frequency is an important variable to consider when vacuum cleaning methods are going to be tested and proposed for maintenance. The hydraulic efficiency exhibited remarkable performance, filtering virtually the entirety (100%) of the applied rainfall when the sediment surface load was lower than 4 kg/m2. However, when this threshold was exceeded, surface runoff was observed. The slab’s efficiency in retaining pollutants was notably high, with 96% for Chemical Oxygen Demand (COD), 76% for Total Nitrogen (TN), 79% for Total Phosphorus (TP), and 98% for Total Suspended Solids (TSS).
Year: 2024