A new surface runoff treatment system has been designed for London Heathrow Airport, which incorporates separate floating constructed wetlands or reedbeds and sub-surface flow constructed wetlands as major pollutant removal systems. The primary requirement of the newly developed treatment system is to control the concentrations of glycols following their use as de-icers and anti-icers within the airport. The ability of reedbeds to contribute to this treatment role was fully tested through pilot scale, on-site experiments over a 2 year period. The average reductions in runoff BOD concentrations achieved by pilot scale surface flow and sub-surface flow reedbeds were 30.9% and 32.9%, respectively. The corresponding average glycol removal efficiencies were 54.2% and 78.3%, following shock dosing inputs. These treatment performances are used to predict the required full scale constructed wetland surface areas needed to attain the desired effluent water quality. The treatment system also incorporates aeration, storage and, combined with reedbed technology, has been designed to reduce a mixed inlet BOD concentration of 240 mg/l to less than 40 mg/l for water temperatures varying between 6°C and 20°C.
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Research Article|
December 01 2001
The integration of constructed wetlands into a treatment system for airport runoff
D.M. Revitt;
*Urban Pollution Research Centre, Middlesex University, Bounds Green Road, London N11 2NQ, UK. (E-mail: [email protected])
E-mail: [email protected]
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P. Worrall;
P. Worrall
**Penny Anderson Associates, 60 Park Road, Buxton, Derbyshire, SK17 6SN, UK. (E-mail: [email protected])
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D. Brewer
D. Brewer
***Heathrow Airport Ltd, Bath Road, Harlington, Middlesex, UK. (E-mail: [email protected])
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Water Sci Technol (2001) 44 (11-12): 469–476.
Citation
D.M. Revitt, P. Worrall, D. Brewer; The integration of constructed wetlands into a treatment system for airport runoff. Water Sci Technol 1 December 2001; 44 (11-12): 469–476. doi: https://doi.org/10.2166/wst.2001.0868
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