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Performance of vegetated biofilters for highway runoff treatment
Griessler Bulc, Tjaša ; Šajn-Slak, Alenka
Highways have a long-term impact on the environment, therefore a sustainable approach to their design is vital. In the spring of 2001 a pilot vegetated biofilter (VB), based on constructed wetland ...technology, was set up at a section of the northeast-southwest motorway in Slovenia. It was designed for acritical flow of 11.75 Us for 0.75 ha of catchment area. It consisted of a sedimentation basin covering an area of 36 m2 and a VB of 85 m2. The VB was filled with sand media and planted with reeds. Performance efficiency of the system was evaluated from summer to autumn 2001. Some of the physical and chemical parameters monitored varied noticeably. Removal efficiency was 69% for suspended solids, 97% for settlement solids, 51% for COD, 11% for BOD5 and80% for Fe. Heavy metals such as Cz, Zn, Cd, Ni and Pb were below limited level at the inflow with reduction efficiency in the system of over 90%. Concentrations of N and P showed a limited level of nutrients for biological processes. Results of the study suggest that VB could be an alternative for highway runoff treatment. Further long-term investigations are needed to provide more data on their proper design.
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