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Water 2016, 8(8), 349; doi:10.3390/w8080349

Controlling Stormwater Quality with Filter Soil—Event and Dry Weather Testing

1
Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg, Denmark
2
Department of Geosciences and Natural Resource Management, Faculty of Science, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg, Denmark
3
EnviDan A/S, Fuglebækvej 1A, 2770 Kastrup, Denmark
*
Author to whom correspondence should be addressed.
Academic Editor: Brigitte Helmreich
Received: 7 June 2016 / Revised: 8 August 2016 / Accepted: 9 August 2016 / Published: 17 August 2016
(This article belongs to the Special Issue Urban Drainage and Urban Stormwater Management)
View Full-Text   |   Download PDF [922 KB, uploaded 17 August 2016]

Abstract

The use of filter soil is increasing for control of quality of stormwater runoff prior to infiltration or discharge. This study aimed to gain knowledge about treatment efficacy of filter soils at field scale. Percolate samples from swale-trench systems with filter soil based on agricultural till with/without limestone were monitored for 15 and 9 rain events respectively. Further, two curb extensions with filter soil based on landfill soil were monitored for 10 and 8 events. Pollutant concentrations in percolate were compared to influent samples from the catchment area. Additionally one of the curb extensions was tested twice by adding high-dose synthetic influent containing runoff pollutants of concern. Despite generally low influent pollutant levels, phosphorus, copper, zinc, lead and some polyaromatic hydrocarbons exceeded guiding criteria for protection of groundwater and freshwater. Concentrations in the percolate were in most cases reduced, but phosphorus increased and despite reduced concentrations copper, lead and benzo(a)pyrene still exceeded guiding criteria. Pollutants from the synthetic influent were efficiently retained, except the pesticide MCPA. Filter soil based on landfill soil tended to perform better than agricultural till. No impact of limestone was observed. Overall the filter soils performed well in retaining pollutants, despite simultaneous processes of mobilization and immobilization. View Full-Text
Keywords: bioretention; bioswales; heavy metals; infiltration; organic carbon; phosphorous; stormwater runoff; water quality bioretention; bioswales; heavy metals; infiltration; organic carbon; phosphorous; stormwater runoff; water quality
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cederkvist, K.; Jensen, M.B.; Ingvertsen, S.T.; Holm, P.E. Controlling Stormwater Quality with Filter Soil—Event and Dry Weather Testing. Water 2016, 8, 349.

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