Performance of Sand and Mixed Sand–Biochar Filters for Treatment of Road Runoff Quantity and Quality
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-04
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Mcode
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Language
en
Pages
17
Series
Water (Switzerland), Volume 15, issue 8
Abstract
Nature-based solutions and similar natural water retention measures to manage urban runoff are often implemented by cities in order to reduce runoff peaks, catch pollutants, and improve sustainability. However, the performance of these stormwater management solutions is relatively rarely assessed in detail prior to their construction, or monitored and evaluated following implementation. The objective of this study was to investigate the field-scale performance of road runoff filters with respect to the management of stormwater quantity and quality. This study synthesizes data from two intensive measurement surveys after the construction of sand and biochar-amended road runoff filters. The filters were able to strongly control the runoff volume and shape of the hydrograph. The long-term retention was about half that of the water inflow, and a hydrographic analysis showed the significant but strong event-size-dependent detention of runoff in both the sand and the sand–biochar filters. The biochar amendment in the filter showed no clear hydrological impact. The pollutant attenuation of the implemented road runoff filters was modest in comparison with that observed under controlled conditions. The impact of the biochar layer on the effluent water quality was observed as the levels of phosphorous, organic carbon, K, Ca and Mg in the sand–biochar filter effluent increased in comparison with the sand filter.Description
Funding Information: This research was funded by the Academy of Finland (326787), EU Water JPI-EviBAN project (Evidence-based assessment of NWRM for sustainable water management). Publisher Copyright: © 2023 by the authors.
Keywords
filter, hydrograph, road, runoff, stormwater, water quality
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Citation
Koivusalo, H, Dubovik, M, Wendling, L, Assmuth, E, Sillanpää, N & Kokkonen, T 2023, ' Performance of Sand and Mixed Sand–Biochar Filters for Treatment of Road Runoff Quantity and Quality ', Water (Switzerland), vol. 15, no. 8, 1631 . https://doi.org/10.3390/w15081631
