Use of Concrete Additives to Improve the Quality of Stormwater Runoff from a Car Park

Publisher:
IWA
Publication Type:
Conference Proceeding
Citation:
Website Proceedings of the 11th International Conference on Urban Drainage, 2008, pp. 1 - 10
Issue Date:
2008-01
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This paper describes a three-year study of two innovative stormwater infiltration/filtration systems and their ability to reduce and retain pollutants present within stormwater runoff. The systems contain specially designed porous concrete pipes. Stormwater exfiltrates through the permeable walls of the pipes into the surrounding substrate media material. Iron oxides are recognised for their ability to remove heavy metals from stormwater, due to the process of chemical precipitation. The porous concrete pipes used within the system located within the Mills Park Tennis Centre, Asquith, were injected with iron oxides during the manufacturing process. The porous pipes within the second study system located within Hindmarsh Park, Kiama, did not have iron oxide additives. The influence of these iron oxides forms the focus of this paper. Overall, it was found that the Asquith system had the ability to remove substantial amounts of dissolved copper and zinc from the car park runoff. Significantly lower outlet concentrations were achieved by the Asquith system. The dissolved iron concentration was found to increase after passing through the Asquith system, indicating that the iron oxide injected pipes were leaching iron. Comparisons with water quality guidelines indicate that the resulting iron concentrations are still below the recommended guideline levels.
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