An experimental constructed wetland system for the treatment of highway runoff in the UK.
Shutes, R. Brian E., Revitt, D. Mike, Scholes, Lian N. L., Forshaw, M. and Winter , B. (2001) An experimental constructed wetland system for the treatment of highway runoff in the UK. Water Science and Technology, 44 (11). pp. 571-578. ISSN 0273-1223
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This paper compares the performance of an experimental highway runoff treatment system, incorporating a subsurface flow constructed wetland, with that of a vegetated balancing pond. Both systems are located on the same major road in the UK which opened in November 1998. Copper, chromium and nickel total aqueous metal concentrations, although low, have been consistently removed (maximum efficiencies of 67.3, 69.8 and 87.0% respectively in the constructed wetland), particularly in the summer. Zinc showed the highest aqueous metal concentrations and the generally positive removal by the constructed wetland system (maximum efficiency of 60.6%) correlates with the expected metal uptake by Typha latifolia and Phragmites australis. Sediment levels for these metals and for lead progressively decreased over the one year monitoring period. For the two storm events monitored in the constructed wetland system, all metals showed evidence of removal (removal efficiencies of 24.2 to 99.4%) except for copper. Lead and cadmium demonstrated the highest removal efficiencies followed by nickel and zinc. For both storms, the wetland acted as a source of copper (removal efficiencies of -88.4 to -97.1%), which may be explained by the die-back of aquatic plants and consequent release of organically bound copper.
|Research Areas:||Science & Technology > Environmental Science|
|Citations on ISI Web of Science:||22|
|Deposited On:||28 Aug 2009 05:54|
|Last Modified:||06 Feb 2013 11:53|
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