Mangangka, Isri R. and Liu, An and Egodawatta, Prasanna and Goonetilleke, Ashantha
(2015)
Performance characterisation of a stormwater treatment bioretention
basin.
Journal of Environmental Management, 150.
pp. 173-178.
Abstract
Treatment performance of bioretention basins closely depends on hydrologic and hydraulic factors such
as rainfall characteristics and inflow and outflow discharges. An in-depth understanding of the influence
of these factors on water quality treatment performance can provide important guidance for effective
bioretention basin design. In this paper, hydraulic and hydrologic factors impacting pollutant removal by
a bioretention basin were assessed under field conditions.
Outcomes of the study confirmed that the antecedent dry period plays an important role in influencing
treatment performance. A relatively long antecedent dry period reduces nitrite and ammonium concentrations
while increasing the nitrate concentration, which confirms that nitrification occurs within
the bioretention basin. Additionally, pollutant leaching influences bioretention basin treatment performance,
reducing the nutrients removal efficiency, which was lower for high rainfall events. These outcomes
will contribute to a greater understanding of the treatment performance of bioretention basins,
assisting in the design, operation and maintenance of these systems.
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