10.4122/1.1000001054 Jensen, M.B. Bisballe, L. Road runoff treatment with dual porosity filtration - 18 m3/h subsurface pilot construction in \303\230restad, Copenhagen DTU Library, Technical University of Denmark (DTU) 2005 Road runoff treatment; dual porosity filtration Orestad Danish Centre for Forest, Landscape and Planning, The Royal Veterinary and Agricultural University Ramb\303\270ll Denmark en Conference full text 10.4122/1.1000001053 application/pdf 1 In Orestad, - a 310 hectares development area in Copenhagen, storm water runoff is discharged into open canals that serve recreational purposes too. Runoff from trafficked surfaces (i.e. road runoff) has to be cleaned to obtain high quality canal water. Consequently roof runoff, which is discharged directly to the canals, and road runoff are handled in individual sewer systems. Available techniques for wastewater treatment do not fulfill the requirements in Orestad regarding effluent quality, treatment mechanisms and/or land consumption. This paper describes the development and preliminary testing of a \342\200\234green\342\200\235 concept for high-level road runoff treatment in dense urban areas. The concept is based on the patent-applied technology Dual Porosity Filtration (DPF), which mimics natural solute transport processes in fractured till. The treatment facility is built from rigid horizontal nylon sheets - supporting flow, interlaid by layers of low porosity filtering materials - supporting contaminants retention. Gravity forces silt and clay sized particles to deposit in low porosity layers, thus avoiding clogging of flow supporting layers. Dissolved contaminants are adsorbed while passing surfaces of the filtering material. No chemicals are applied. Maintenance of the facility is limited, and its lifetime is estimated to > 20 years. Green space consumption is minimized by placing the facility belowground.