Abstract
The free surface flow Integrated Constructed Wetlands (ICW) concept explicitly combines the objectives of cleansing and managing water flow from farmyards with that of integrating the wetland infrastructure into the landscape and enhancing its biological diversity. This leads to system robustness and sustainability. Hydraulic dissipation, vegetation interception, and evapotranspiration create an additional freeboard at the outlet of each wetland segment and at the point of discharge, thus enhancing hydraulic residence time and cleansing capacity during hydraulic fluxes. The principal design criteria leading to adequate effluent water quality (i.e., molybdate reactive phosphorus less than 1 mg/1) from ICW are that the wetland area needs to be sized by a factor of at least 1.3 times the farmyard area and the aspect ratio for the individual wetland segments (i.e., approximately four cells) needs to be less than 1:2.2 (width to length). Within a year of ICW commissioning, approximately 75% of farmyard runoff was intercepted, leading to improvements in the receiving surface waters of the catchment. Most of the recorded phosphate concentrations after ICW treatment agreed with the Irish Urban Wastewater Treatment Regulation 2001, which can be used as a benchmark to assess ICW treatment performance and which is usually applied unofficially to ICW even if it may appear to be too stringent. A case study of 13 ICW systems suggested that phosphorus exported from an ICW system was similar to the typical background concentrations of phosphorus export rates from land to water.
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Literature Cited
American Public Health Association (APHA). 1998. Standard Methods for the Examination of Water and Wastewater, twentieth edition. American Public Health Association (APHA), American Water Works Association and Water and Environmental Federation, Washington, DC, USA.
Bormann, F. H. and G. E. Likens. 1981. Pattern and Process in a Forested Ecosystem. Springer, New York, NY, USA.
Braskerud, B. C. 2002. Factors affecting phosphorus retention in small constructed wetlands treating agricultural non-point source pollution. Ecological Engineering 1: 41–61.
British Standards Institute (BSI). 1999. Code of Practice for Site Investigation. BSI, London, UK. BS 5930.
Carroll, P., R. Harrington, J. Keohane, and C. Ryder. 2005. Water treatment performance and environmental impact of integrated constructed wetlands in the Anne Valley watershed, Ireland. p. 207–17. In E. J. Dunne, K. R. Reddy, and O. T. Carton (eds.) Nutrient Management in Agricultural Watersheds: A Wetlands Solution. Wageningen Academic Publishers, Wageningen, the Netherlands.
Dunne, E. J., N. Culleton, G. O’Donovan, R. Harrington, and K. Daly. 2005a. Phosphorus retention and sorption by constructed wetland soils in Southeast Ireland. Water Research 39: 4355–62.
Dunne, E. J., N. Culleton, G. O’Donovan, R. Harrington, and A. E. Olsen. 2005b. An integrated constructed wetland to treat contaminants and nutrients from diary farmyard dirty water. Ecological Engineering 24: 221–34.
Environmental Protection Agency (EPA). 2002. Interim report: the biological survey of river quality 2001. EPA, Johnston Castle, Wexford, Ireland.
Forget, C., A. Drizo, Y. Comeau, and R. P. Chapuis. 2001. Elimination du phosphore d’effluents de pisciculture par marais artificiel a substrat absorbant. Presented at Americana 2001, Reseau Environnement, Montreal, March 28–30 (in French).
Gray, S., J. Kinross, P. Read, and A. Marland. 2000. The nutrient assimilative capacity of maerl as a substrate in constructed wetland system for waste treatment. Water Research 34: 2183–90.
Harrington, R., E. J. Dunne, P. Carroll, J. Keohane, and C. Ryder. 2005. The concept, design and performance of integrated constructed wetlands for the treatment of farmyard dirty water. p. 179–88. In E. J. Dunne, K. R. Reddy, and O. T. Carton (eds.) Nutrient Management in Agricultural Watersheds: A Wetlands Solution. Wageningen Academic Publishers, Wageningen, the Netherlands.
Harrington, R. and C. Ryder. 2002. The use of integrated constructed wetlands in the management of farmyard runoff and waste water. In Proceeding of the National Hydrology Seminar on Water Resources Management Sustainable Supply and Demand. The Irish National Committees of the IHP (International Hydrological Programme) and ICID (International Commission on Irrigation and Drainage), Tullamore, Ireland.
Hill, C. M., J. Duxbury, L. Geohring, and T. Peck. 2000. Designing constructed wetlands to remove phosphorus from barnyard runoff: a comparison of four alternative substrates. Journal of Environmental Science and Health Part A — Toxic and Hazardous Substances and Environmental Engineering 35: 1357–75.
Irish Phosphorus Regulations. 1998. Water Quality Standards for Phosphorus. Local Government (Water Pollution) Act 1977. Irish Government, Dublin, Ireland. S.I. No. 258 1998.
Irish Urban Waste Water Treatment Regulations. 2001. Urban Waste Water Treatment Regulations. Irish Government, Dublin, Ireland. S.I. No. 252 2001.
Kadlec, R. L. and R. H. Knight. 1996. Treatment Wetlands. CRC Press, Boca Raton, FL, USA.
Karathanasis, A. D., C. L. Potter, and M. S. Coyne. 2003. Vegetation effects on fecal bacteria, BOD, and suspended solid removal in constructed wetlands treating domestic wastewater. Ecological Engineering 20: 157–69.
Keohane, J., P. Carroll, R. Harrington, and C. Ryder. 2005. Integrated constructed Wetlands for farmyard dirty water treatment: a site suitability assessment. p. 196–206. In E. J. Dunne, Ks. R. Reddy, and O. T. Carton (eds.) Nutrient Management in Agricultural Watersheds: A Wetlands Solution. Wageningen Academic Publishers, Wageningen, the Netherlands.
Lee, B. H. and M. Scholz. 2007. What is the role of Phragmites australis in experimental constructed wetland filters treating urban runoff? Ecological Engineering 29: 87–95.
Lee, B. H., M. Scholz, and A. Horn. 2005. Constructed wetlands for the treatment of concentrated stormwater runoff (Part A). Environmental Engineering Science 23: 191–202.
McGarrigle, M., T. Champ, R. Norton, P. Larkin, and M. Moore. 1993. The trophic status of Lough Conn, County Mayo, Ireland. Mayo County Council, Castlebar, Ireland.
Minitab Inc. 2003. Minitab Statistical Software, Release 14 for Windows. State College, PA, USA.
Mitsch, W. J. and J. G. Gosselink. 2000. Wetlands, third edition. John Wiley & Sons, Inc., New York, NY, USA.
Mitsch, W. J. and S. E. Jorgensen. 2003. Ecological Engineering and Ecological Restoration. John Wiley & Sons, Inc., New York, NY, USA.
Morgan, G., Q. Xie, and M. Devins. 2000. Phosphorus export from farm in Dripsey catchment, County Cork, Ireland. Environmental Protection Agency, Dublin, Ireland. Research and Development Report, Series No. 6.
Newman, J. M., J. C. Clausen, and J. A. Neafsey. 2000. Seasonal performance of a wetland constructed to process dairy milkhouse wastewater in Connecticut. Ecological Engineering 14: 181–98.
Otte, M. L. 2005. Wetlands of Ireland — An overview: diversity, ecosystem services and utilization. p. 39–44. In E. J. Dunne, K. R. Reddy, and O. T. Carton (eds.) Nutrient Management in Agricultural Watersheds: A Wetlands Solution. Wageningen Academic Publishers, Wageningen, the Netherlands.
Reddy, G. B., P. G. Hunt, R. Phillips, K. Stone, and A. Grubbs. 2001. Treatment of swine wastewater in marsh-pond-marsh constructed wetlands. Water Science and Technology 44: 545–50.
Rodgers, M., P. Gibbons, and J. Mulqueen. 2003. Nitrate leaching on a sandy loam soil under different dairy wastewater applications. In Proceedings of the International Water Association’s 7th International Specialized Conference on Diffuse Pollution and Basin Management, University College Dublin, Dublin, Ireland.
Scholz, M. 2006. Wetland Systems to Control Urban Runoff. Elsevier, Amsterdam, the Netherlands.
Seo, D. C., J. S. Cho, H. J. Lee, and J. S. Heo. 2005. Phosphorus retention capacity of filter media for estimating the longevity of constructed wetland. Water Research 39: 2445–57.
Smith, E., R. Gordon, A. Madani, and G. Stratton. 2006. Year-round treatment of diary wastewater by constructed wetlands in Atlantic Canada. Wetlands 26: 349–57.
Stationary Office. 2006. European Communities (Good Agricultural Practice for Protection of Waters) Regulations 2006. Government Publications Office, Dublin, Ireland. S.I. No. 378 of 2006.
Tanner, C. C., J. P. S. Sukias, and M. P. Upsdell. 1999. Substratum phosphorus accumulation during maturation of gravel-bed constructed wetlands. Water Science and Technology 40: 147–54.
Townend, J. 2002. Practical Statistics for Environmental and Biological Scientists. John Wiley & Sons, Inc., New York, NY, USA.
Tunney, H., O. Carton, T. O’Donnell, and A. Fanning. 1998. Phosphorus loss from soil to water. Teagasc, Ireland. End of Project Report ARMIS 4022.
United Nations Environment Programme (UNEP). 2003. Convention on Biological Diversity. 9th Meeting of the Subsidiary Body on Scientific, Technical and Technological Advice (November 10–14, 2003), Montreal, Canada (UNEP)/CBD/ SBSTTA/9/INF/4.
Vesanto, J., J. Himberg, E. Alhoniemi, and J. Parhankangas. 2000. SOM Toolbox for Matlab 5 Documentation. Helsinki University of Technology, Helsinki, Finland.
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Scholz, M., Harrington, R., Carroll, P. et al. The Integrated Constructed Wetlands (ICW) concept. Wetlands 27, 337–354 (2007). https://doi.org/10.1672/0277-5212(2007)27[337:TICWIC]2.0.CO;2
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DOI: https://doi.org/10.1672/0277-5212(2007)27[337:TICWIC]2.0.CO;2