Storm Water Detention Ponds: Modeling Heavy Metal Removal by Plant Species and Sediments
Publication: Journal of Environmental Engineering
Volume 132, Issue 9
Abstract
Laboratory and field studies were conducted to elucidate heavy metal removal by three wetland grasses and sediments in storm water detention pond. The removal of heavy metals including Cd, Cu, Pb, and Zn was mediated by fluid-flow intensity in the reactors. The growth of plants and the removal rates of contaminants were plant species dependent. All three wetland grasses removed contaminants from the spiked nutrient solutions. A first-order kinetic model adequately represented the removal of contaminants by plants. The analyses of undisturbed sediment cores in detention pond revealed strong stratification of heavy metal concentrations at the sediment–water interface. A simple model that integrates heavy metal removal by aquatic plants and sediments in storm water detention ponds is proposed. The model provides an estimate of contaminant residence time which can be related to hydraulic residence time in storm water detention ponds.
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Acknowledgments
This work was partially funded by the Minnesota Department of Transportation. The writers are very grateful for the suggestions and guidance provided by the Technical Advisory Panel on this project. Professor David Biesboer provided valuable suggestions on experimental work in a greenhouse at the University of Minnesota. Additional support for this work was provided by the National Center for Earth-Surface Dynamics (NCED), a Science and Technology Center funded by the Office of Integrative Activities of the National Science Foundation (under Agreement No. NSFEAR-0120914).
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 9 • September 2006
Pages: 1034 - 1042
Copyright
© 2006 ASCE.
History
Received: May 19, 2005
Accepted: Feb 9, 2006
Published online: Sep 1, 2006
Published in print: Sep 2006
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