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- Hallberg, Magnus, et al.
(författare)
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Evaluation of a sand filter material for road runoff treatment– Pilot-scale field trial focused on copper and zinc removal
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The negative effects of stormwater discharges on receiving aquatic environments and the need for their purification were highlighted by the EU courts' "Weser-Ruling" in May 2020. The ruling stated the need for removal of dissolved pollutants. The decision justifies field studies for development of far-reaching methods for runoff treatment. In this in situ study, a standard sand was used as medium for road runoff filtration and removal of dissolved and particle-bound (< 0.45 µm) zinc (Zn) and copper (Cu), Data collected included 24 road runoff events, mimicking the flow variations and pollutant emissions over a seven-month period. The findings showed that filter sand can be used to remove Zn and Cu from road runoff in a gravity fed treatment system. The removal of total Zn and Cu was 93% and 67%, respectively. Dissolved Zn was efficiently removed by the sand (87%), however not Cu (19%). The sand efficiently removed total suspended solids (TSS) from maximum occurring 443 mg L-1 to below 5 mg L-1. No head loss due to the TSS loadings was observed. The initial studies show the sand's potential to remove the investigated metals, but in the longer term, effluent concentrations may exceed emission permit values.
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| 2. |
- Hallberg, Magnus, et al.
(författare)
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Evaluation of a sand filter material for road runoff treatment- pilot-scale field trial focused on copper and zinc removal
- 2022
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Ingår i: Water practice and technology. - : IWA Publishing. - 1751-231X. ; 17:8, s. 1652-1665
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Tidskriftsartikel (refereegranskat)abstract
- The effects of stormwater discharges on receiving aquatic environments and the need for their purification were highlighted by an EU court in May 2020. The ruling stated the need for removal of dissolved pollutants, which justifies field studies for development of far-reaching methods for runoff treatment. In this study, a standard sand was used as medium for road runoff filtration and removal of dissolved and particle-bound (<0.45 mu m) zinc (Zn) and copper (Cu). Data included 24 road runoff events, mimicking the flow variations and pollutant emissions over a seven-month period. The findings showed that sand can be used to remove Zn and Cu from road runoff in a gravity fed treatment system at a surface load ranging from 16.8 to 201 L m(-2) h(-1). The removal of total Zn and Cu was 93 and 67%, respectively. Dissolved Zn was efficiently removed by the sand (87%), however not Cu (19%). The sand efficiently removed total suspended solids (TSS) from the maximum occurring 443 mg L-1 to below 5 mg L-1. No head loss due to the TSS loadings was observed. The sand's potential to remove the investigated metals was shown, but in the longer term, effluent concentrations may exceed permitted values.
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| 3. |
- Renman, Agnieszka, et al.
(författare)
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Treatment method to remove dissolved metals from motorway runoff – initial observations and implications for operation and maintenance
- 2021
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Konferensbidrag till NORDIWA, 28 september – 1 oktober, 2021, Göteborg Treatment method to remove dissolved metals from motorway runoff – initial observations and implications for operation and maintenance Magnus Hallberg1, Agnieszka Renman2, Raúl Rodríguez Gómez2, Gunno Renman2, Liselott Berndtsson1 1 Swedish Transport Administration, Stockholm, 2 Royal Institute of Technology, Division of Water and Environmental Engineering, Stockholm A large number of different stormwater treatment systems were designed over the years. Unfortunately, their adaptation to operation and maintenance were not always taken into account. During the extensive construction of treatment plants at the new motorway bypass Stockholm, the Swedish Transport Administration investigate sustainable and maintenance efficient stormwater solutions for removal of dissolved pollutants. Moreover, the environmental authorities claim for high consent limits of stormwater effluent metal concentrations with particular regard to zinc (Zn). For this reason, the Swedish Transport Administration started a project in 2020. Runoff at three sites along a section of the E4 motorway, Stockholm, are used for testing filter materials in large column experiments and full-scale filter wells to assess removal of dissolved pollutants. The impact of particulate matter for filter clogging is also studied. The filter wells, situated at Lilla Essingen, aim to remove dissolved metals from road runoff. The pre-treated water, where the load of particulate matter reduces in an open storage pond, is pumped into two parallel filter wells, each filled with 2.7 m3 Leca Filtralite® P. The filter system received stormwater from July 2020 and the first part of the trial terminated in December 2020. The volume treated during this period was approximately 1300 m3. We performed automatic flow-proportional and occasional grab sampling of influent and effluent stormwater to the filters. The water analyses comprised total and dissolved metals, suspended solids (SS), oil, electrical conductivity, turbidity and pH. We continuously monitored the pressure drop in the filters. The SS and turbidity in the pre-treated, influent water ranged from below 5 up to 170 mg/l and 5.2 to 358 NTU, respectively. The filters removed SS efficiently (78%) and turbidity of effluent water was in average 7.8 NTU. The average removal was for dissolved Zn 94%. The oil index (fraction C10-C40) investigated reached 783 µg/l in the influent but was always below 50 µg/l in the filter effluent. The correlation between turbidity and SS was linear (R2=0.9806). Influent pH was in July and December 7.5 and 7.4 respectively. The filter effluent had a pH of 10.2 in July and 9.5 in December. The filters showed continuous pressure drop during the study period however it did not affect the water flow through the filters. After six months of operation and up to 26 regulated pond volumes, the filter showed no signs of declining purification function or clogging.
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