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Open AccessArticle

Performance Evaluation of a Floating Treatment Wetland in an Urban Catchment

Stormwater Research Group, University of the Sunshine Coast, Sippy Downs Drive, Sippy Downs 4558, Queensland, Australia
Drapper Environmental Consultants (DEC), 12 Treetops Avenue, Springfield Lakes 4300, Queensland, Australia
Covey Associates Pty Ltd., 124 Duporth Ave, Maroochydore 4558, Queensland, Australia
Author to whom correspondence should be addressed.
Academic Editor: John W. Day
Water 2016, 8(6), 244;
Received: 21 April 2016 / Revised: 31 May 2016 / Accepted: 6 June 2016 / Published: 8 June 2016
Floating Treatment Wetland (FTW) systems are purpose-built devices designed to replicate the water treatment processes that occur in and around naturally occurring floating vegetated islands. FTWs can be used to improve the water quality of water storage ponds by contributing to water treatment processes through adhesion, filtration, nutrient uptake (direct use by plants), and sequestration. This paper presents the results of a twelve-month investigation into the pollution removal performance of a FTW receiving stormwater runoff from a 7.46 ha urban residential catchment. As anticipated, there was a high degree of variation in FTW treatment performance between individual rainfall events. Overall pollution removal performance was calculated to be 80% for Total Suspended Solids (TSS), 53% for Total Phosphorous (TP), and 17% for Total Nitrogen (TN) for a FTW footprint of 0.14% of the contributing catchment. TSS and TP concentrations were found to be significantly reduced after FTW treatment. The minimum FTW footprint to catchment size ratio required to achieve regulated nutrient removal rates was calculated to be 0.37%. Sum of loads calculations based on flow resulted in pollution load reductions of TSS 76%, TP 55%, and TN 17%. Pollution treatment performance (particularly for TN) was found to be affected by low influent concentrations, and highly-variable inflow concentrations. The study demonstrated that FTWs are an effective treatment solution for the removal of pollution from urban stormwater runoff. View Full-Text
Keywords: floating treatment wetland; stormwater pollution; urban stormwater floating treatment wetland; stormwater pollution; urban stormwater
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Nichols, P.; Lucke, T.; Drapper, D.; Walker, C. Performance Evaluation of a Floating Treatment Wetland in an Urban Catchment. Water 2016, 8, 244.

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