Efficient heavy-metal removal from road runoff should be realized with particle separation and adsorption. As adsorbents, three zeolites and three ferric hydroxides were tested for copper and zinc removal. Sorption capacity and kinetics were evaluated with batch and specific column experiments. Results evidence that sorption capacity and kinetics of all ferric hydroxides were superior to the zeolites. Increased electrical conductivity revealed severe desorption of copper and zinc only from zeolites. For the full-scale treatment plant, zeolite 3 and Ferrosorp are used in one of the two retention filters each. The zeolite retention filter is not in service during winter to prevent desorption caused by de-icing salt.
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References
Boller M, Langbein S, Steiner M (2006) Characterization of road runoff and innovative treatment technologies. Proceedings of the 8th highway and urban environment symposium. Springer, Amsterdam
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Boller, M., Langbein, S., Steiner, M. (2007). Development and full-scale implementation of a new treatment scheme for road runoff. In: Morrison, G.M., Rauch, S. (eds) Highway and Urban Environment. Alliance For Global Sustainability Bookseries, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6010-6_39
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