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Phosphorus Retention and sorption by constructed wetland soils.
Dunne, E. Culleton, Noel O'Donovan, Grace Harrington, Rory
Dunne, E.
Culleton, Noel
O'Donovan, Grace
Harrington, Rory
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2005-01-01
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eopr-4649a.pdf
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Dunne, E., Culleton, N., O'Donovan, G., Harrington, R., Phosphorus Retention and sorption by constructed wetland soils, End of Project Report, Teagasc, 2005.
Abstract
Phosphorus plays a major role in the eutrophication of freshwater systems. Wetland systems either natural or constructed have an inherent ability to cycle and retain P. Physical, chemical and biological processes regulate P retention in wetland soils and sediments. Of those processes, sorption and precipitation are important in retaining P. Sorption is typically greater under aerobic soil/sediment conditions than anaerobic conditions. Under anaerobic conditions, Fe plays a major role in P dynamics, whereas Al is not affected by changes in redox. Precipitation of P as insoluble Ca bound P is a dominant transformation at high pH. Long-term P retention by wetland systems includes accretion and decomposition of organic and detrital material, and its associated P content. Case studies reviewed illustrated that P retention in natural and constructed wetland systems can vary by several orders of
30
magnitude depending on site-specific factors. The literature reviewed also indicates that using wetlands to retain P from agricultural practices is significant and variable.