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Removal of pollutants from road runoff - the Vallby system in Sweden
KTH, School of Architecture and the Built Environment (ABE). (Miljögeokemi och ekoteknologi)
1999 (English)Conference paper (Other academic)
Abstract [en]

Storm-water runoff from roads often contains significant quantities of metals and other solids that should be removed before infiltrating into the soil or being discharged into aquatic systems. Many treatment methods based on ecological-engineering principles, utilizing such features as detention ponds and wetlands have been presented during the last number of years. Storm water contains highly bioavailable and mobile dissolved metals. Any treatment measures intended to immobilize these metals must utilize adsorption, ion exchange, and/or precipitation. Additionally, special traps designed to catch particulate ­bound metals should also be included. A treatment plant has recently been constructed in the city of Västerås in central Sweden, where all these removal methods were implemented. The system consists of three treatment steps. In the first step storm water enters a detention pond for the settling of coarse particles. In the second step storm water flows through a system of prefabricated filters installed in manholes. The storm water first flows upward through permeable plastic tubes designed to remove coarse particles and humic substances. It then flows slowly downward through the next filter containing high­ sorption-capacity reactive media. Finally, in the third step of the treatment the water enters a stream and pond system created in a golf course. The system of ditches together with the pond is designed mainly for the reduction of nitrogen. The estimated reduction of pollutants passing through the entire system to the outlet is about 90% for phosphorus, 80% for nitrogen and between 70-90% for metals in general. An outline of the research is presented here.

Place, publisher, year, edition, pages
1999. 1841-1846 p.
National Category
Engineering and Technology Civil Engineering
URN: urn:nbn:se:kth:diva-82472OAI: diva2:498267
8th International Conference Urban Storm Drainage, Sydney, Australia
NR 20140805Available from: 2012-02-11 Created: 2012-02-11Bibliographically approved

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