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Sustainability 2017, 9(10), 1687; doi:10.3390/su9101687

Stormwater Treatment Evaluation of a Constructed Floating Wetland after Two Years Operation in an Urban Catchment

1
Covey Associates Pty Ltd., 124 Duporth Ave, Maroochydore, QLD 4558, Australia
2
Stormwater Research Group, University of the Sunshine Coast, Sippy Downs Drive, Sippy Downs, QLD 4558, Australia
*
Author to whom correspondence should be addressed.
Received: 6 September 2017 / Revised: 14 September 2017 / Accepted: 20 September 2017 / Published: 22 September 2017
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Abstract

Constructed Floating Wetlands (CFW) for stormwater treatment are increasingly used to treat urban runoff. However, studies of large-scale systems and the long-term evaluation of their treatment efficiency are scarce. This article presents the final results of a two-year study of the pollutant removal performance of a CFW in a stormwater pond capturing runoff from a low-residential catchment in South-East Queensland (Australia) under subtropical conditions. Although the CFW treatment area to catchment ratio was only 0.14%, the results demonstrated a significant removal of both Total Suspended Solids (TSS) and Total Phosphorus (TP) from the stormwater inflows by the CFW. The efficiency ratios for TSS and TP were 81% and 52%, respectively. While the removal rate for total nitrogen was not significant for the CFW evaluated in this study, the ER was still 17%. However, the ERs for nitrate and nitrogen oxide were both 47%. The study results suggest that it may be possible to increase the pollution removal performance of the CFW by upsizing the system and including intermittent re-aeration zones in the surrounding stormwater pond. The results of this research study clearly demonstrate that CFW can be an effective treatment solution for the removal of pollution from urban stormwater runoff. View Full-Text
Keywords: constructed floating wetlands; stormwater pollution; urban runoff; treatment area to catchment ratio constructed floating wetlands; stormwater pollution; urban runoff; treatment area to catchment ratio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Walker, C.; Tondera, K.; Lucke, T. Stormwater Treatment Evaluation of a Constructed Floating Wetland after Two Years Operation in an Urban Catchment. Sustainability 2017, 9, 1687.

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