Plant growth and nutrient uptake in treatment wetlands for water with low pollutant concentration

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Gilles VincentJacques Brisson

Abstract

The objective of this study was to determine how macrophytes commonly used in treatment wetlands (TWs) respond to water with low pollutant concentration. We measured pollutant removal efficiency and compared growth and nutrient uptake of five macrophytes in demonstration scale units (volume >40 m3) irrigated by water with pollutant concentrations representative of average urban stormwater quality. All species showed a strong productivity gradient along the beds, starting with high biomass - high density near the inlet, then decreasing progressively with distance. Cyperus was by far the most productive species. Phragmites and Thalia had higher biomass in the first few metres of the beds than Typha and Arundo. In terms of pollutant removal, decreasing plant growth may be interpreted as indicative of high efficiency when caused by nutrient depletion. Differences in aboveground biomass between species did not translate into measurable differences in removal efficiency at the outlet. Although Phragmites australis is the species most commonly used in TWs, under the low nutrient load, Cyperus had twice its biomass, and higher N and P uptake. These results highlight the importance of considering wastewater characteristics when selectin...Continue Reading

References

Aug 1, 1992·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
Nov 26, 2008·Trends in Genetics : TIG·Alisdair R Fernie, Nicolas Schauer
Mar 3, 2009·The Science of the Total Environment·Fangyue LiRalf Otterpohl

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Citations

Jun 28, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Carolyn M RodakJason R Vogel
Sep 19, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Umesh GhimireVeera Gnaneswar Gude
May 7, 2019·The Science of the Total Environment·Peter F SchwammbergerStephen J Trueman

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