Abstract
Porous asphalt (PA) pavement systems with and without a geotextile layer were investigated in laboratory experiments to determine the impacts of the geotextile layer on the processes leading to lead ion (Pb2+) removal from stormwater runoff. Two types of geotextile membranes that were placed separately at upper and lower levels within the PA systems were tested in an artificial rainfall experiment while using synthetic rainwater. The effect of storage capacity within the system on Pb2+ removal was also investigated. Results indicated that the use of a geotextile layer resulted in a longer delay to the onset of effluent. The non-woven geotextile membrane that was placed below the reservoir course improved the Pb2+ removal rate by 20% over the removal efficiency of the system while using a woven geotextile placed just below the surface but before the choker course. Pb2+ ions were reduced by over 98% in the effluent after being held for 24 h in reservoir storage. Results suggest that temporary storage of stormwater in the reservoir course of a PA system is essential to improving Pb2+ ion removal capability.
Highlights
Impervious surfaces in urban areas can lead to stormwater related problems, including urban flood events, natural water quality degradation, groundwater level decline, etc
The experiment was conducted in two stages: the first stage was to monitor the Pb2+ ion removal efficiency by Porous asphalt (PA) systems during artificial rainfall event 1 (120 min); the second stage involved a temporary storage period (24 h) of the stormwater that was generated by artificial rainfall event 2 and stored within the reservoir course to analyze any changes in removal efficiency and estimate whether the stormwater discharged from the PA systems could be reused as irrigation water
Laboratory studies were designed to study the removal of Pb2+ ions in stormwater runoff from porous asphalt pavement systems with and without a geotextile layer, two different geotextile types, and two position levels within the pavement structure
Summary
Impervious surfaces in urban areas can lead to stormwater related problems, including urban flood events, natural water quality degradation, groundwater level decline, etc. Stormwater runoff being generated by urban impervious surfaces has been regarded as an important contributor to the degradation of receiving waters, because it carries contaminants accumulated between storm events in the urban environment These pollutants include suspended solids, organic matter, nutrients, heavy metals, oils, and even polycyclic aromatic hydrocarbons (PAHs) [3,4]. PPS are comprised of various pavement layers of porous media resulting in a high infiltration capacity that allows for surface stormwater runoff to pass freely into a reservoir structure for temporary storage that may be harvested for later reuse or released slowly into the underlying soil, receiving water bodies, or drainage systems.
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