| 1. |
- Hallberg, Magnus, et al.
(författare)
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Reactive filters for removal of dissolved metals in highway runoff
- 2007
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Ingår i: Highway And Urban Environment. - 9781402060090 ; , s. 465-474
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Konferensbidrag (refereegranskat)abstract
- A pilot-scale system consisting of presedimentation and a saturated down-flow reactive bed filter was used for cleaning highway runoff. Blast furnace slag (BFS) and Polonite were selected as filter materials. A total suspended solids (TSSs) removal of over 99% was achieved. High removal performance was observed for dissolved Mn, Ni, Co, and Cu. In contrast Al was released after filtration. Metals were retained in the upper layer of the bed filters while a desorption was suggested to take place in the downward layers. This was probably attributed to the elevated salt levels during winter and the intermittent operation.
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| 2. |
- Hvitt Strömvall, Ann-Margret, 1963, et al.
(författare)
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Organic contaminants in urban sediments and vertical leaching in road ditches
- 2006
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Ingår i: 8th Highway and Urban Environment Symposium, Nicosia, Cyprus, 12-14 June 2006, Alliance for Global Sustainability Bookseries, Springer, Editors: Morrison, G.M., Rauch, S., 12. - 9781402060090
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Konferensbidrag (refereegranskat)abstract
- This is a study of the environmental impact of organic contaminants emitted from urban traffic and road infrastructure in Göteborg, Sweden. The vertical leaching of organic contaminants in road ditches, and the occurrence of organic contaminants in stormwater sediment, urban soil and shallow groundwater, have also been investigated. A total of 80 specific organic contaminants were analysed in the stormwater sediment sample, and of these as many as 40 specific organic contaminants were identified. The concentration of total semi-volatiles, alkylbenzenes, aliphatics, 4-nonylphenols, total of mono- and di-nonylphenol ethoxylates, carcinogenic US EPA polycyclic aromatic hydrocarbons PAH–16, diethyl hexylphthalate DEHP and several brominated flame retardants, were all analysed in high concentration. Depth profiles, in clay, clay/sand and sand road ditches, at four places along highway E20, were analysed for a total of 40 specific organic compounds. In the soil profiles, total semi-volatiles (
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| 3. |
- Hvitt Strömvall, Ann-Margret, 1963, et al.
(författare)
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Reactive soil barriers for removal of chromium(VI) from contaminated soil
- 2007
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Ingår i: Highway and Urban Environment. Proceedings of the 8th Highway and Urban Environment Symposium. - Dordrecht : Springer Netherlands. - 9781402060090 ; , s. 295-308
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this project was to find effective reactive materials as use in soil-bed barriers, for remediation of soil contaminated with chromium at Stallbacka industrial area in Sweden. Materials with different reduction/ adsorption capacities of Cr(VI)/Cr(III) were tested in laboratory and in a field pilot-scale experiment. Concentrations of total Cr and Cr(VI) in the soil, highly contaminated with ferrochrome slag, were exceeding the guideline values for contaminated sites in Sweden.Zero-valent iron (Fe0) filling, FeSO4 o7H2O, Na2SO3, field pine bark, modified pine bark, pine sawdust, and sphagnum peat were tested in batch or columns in mixture with the contaminated soil. All the materials, except peat, showed a good ability to reduce Cr(VI) in the batch experiments, and were chosen for further dynamic studies in columns. Iron sulphate and sodium sulphite were both shown to have a good ability to quickly reduce Cr(VI) in the columns, but the use might result in leaching of Fe and SO2- 4 to surface and groundwater. For field bark it took a longer time to reduce/ adsorb the same amounts of chromium, but it was functional for a longer time.Reactive soil-bed barriers were constructed in field: soil with embedded layers of FeSO4, pine bark underlying the soil, and soil without any reactive material layer. The iron sulphate was determined not to be suitable for the soil treatment, due to the high percentage of coarse materials in the soil texture, and thereby a quick washout of FeSO4 during the water infiltration. The field reactive soil barrier with pine bark was proven to be effective in reducing Cr(VI), and also had the capacity to adsorb both total and dissolved chromium leaching from the contaminated soil.
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| 4. |
- Pettersson, Thomas, 1966, et al.
(författare)
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Evolution on Pollutant Removal Efficiency in Stormwater Ponds due to Changes in Pond Morphology
- 2006
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Ingår i: 8th Highway and Urban Environment Symposium, Nicosia, Cyprus, 12-14 June 2006, Alliance for Global Sustainability Bookseries, Springer, Editors: Morrison, G.M., Rauch, S.. - 9781402060090 ; 12
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Konferensbidrag (refereegranskat)abstract
- Ponds are frequently used to remove pollutants from urban runoff, but only a few accurate studies have been carried out to determine the long-term pollutant removal efficiency, and almost none on changes in removal over time. Removal efficiency will be affected by changes in pond morphology, vegetation growth and sediment accumulation. This study presents the evolution of pollutant removal efficiency over a seven-year period.The results showed that vegetation growth and increased sediment thickness affected copper, zinc, and nitrogen removal efficiency nega-tively. Concluding recommendations are removal of vegetation in the au-tumn and sediment removal after approximately seven to ten years in op-eration.
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| 5. |
- Renman, Gunno, et al.
(författare)
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Cleaning of highway runoff using a reactive filter treatment plant - a pilot-scale column study
- 2007
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Ingår i: Highway And Urban Environment. - Dordrecht : Springer Netherlands. - 9781402060090 ; , s. 309-317
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Konferensbidrag (refereegranskat)abstract
- Removal of dissolved heavy metals in road runoff can be achieved by filtration through reactive materials. A four-column installation was set up at an existing treatment plant and used to examine different types of filter materials in situ. Two fractions of granulated activated carbon (GAC), Clinoptilolite and Polonite were investigated. The hydraulic loading was 1 m h(-1) and the metal attenuation capacities were studied under unsaturated and saturated conditions. The relative effectiveness of the materials decreased in the order: GAC of fine fraction > GAC of course fraction > zeolite > Polonite. Aluminium, Fe, Mn, and Zn showed the highest concentrations in influent storm water and also showed elevated removal efficiencies.
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