Mangangka, Isri R. and Egodawatta, Prasanna and Parker, Nathaniel and Gardner, Ted and Goonetilleke, Ashantha
(2013)
Performance characterisation of a constructed Wetland.
Water Science & Technology, 68 (10).
pp. 2195-2201.
Abstract
Performance of a constructed wetland is commonly reported as being variable due to the site
specific nature of influential factors. This paper discusses the outcomes from an in-depth study
which characterised the treatment performance of a wetland based on the variation in the runoff
regime. The study included a comprehensive field monitoring of a well-established constructed
wetland in Gold Coast, Australia. Samples collected at the inlet and outlet were tested for Total
Suspended Solids (TSS), Total Nitrogen (TN) and Total Phosphorus (TP). Pollutant concentrations in
the outflow were found to be consistent irrespective of the variation in inflow water quality. The
analysis revealed two different treatment characteristics for events with different rainfall depths. TSS
and TN load reduction was found to be strongly influenced by the hydraulic retention time where
performance was relatively superior for rainfall events below the design event. For small events,
treatment performance was higher at the beginning of the event and gradually decreased during the
course of the event. For large events, the treatment performance was comparatively poor at the
beginning and improved during the course of the event. The analysis also confirmed the variable
treatment trends for different pollutant types.
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