Dynamics of nitrate-nitrogen removal in experimental stormwater biofilters under intermittent wetting and drying

Subramaniam, D., Mather, P., Russell, S., & Rajapakse, J. (2016) Dynamics of nitrate-nitrogen removal in experimental stormwater biofilters under intermittent wetting and drying. Journal of Environmental Engineering, 142(3), Article Number-0.

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High concentrations of nitrate-nitrogen degrade the quality of aquatic environments. The primary mechanism by which nitrate-nitrogen is removed (denitrification) requires anoxic conditions and electron donors. While removal of total and ammonium-nitrogen is often high in stormwater biofilters, poor removal or even the release of nitrate-nitrogen in the outflow has often been observed. Five Perspex biofilter columns (94 mm internal diameter) were fabricated with a filter layer that contained 8% organic material. Columns were operated at 875  mm/h 875  mm/h and fed with simulated stormwater with different antecedent dry days (ADDs) and concentrations of nitrate-nitrogen. Samples were collected from the outflow at different time intervals between 2 and 150 min and were tested for nitrate-nitrogen. The removal of nitrate-nitrogen varied during an event from a high removal percentage (60–90%) in the initial outflow that gradually decreased in the first 30 min and settled at 0–15% removal thereafter. This remained consistent during all simulated events independent of the number of ADDs or inflow concentrations. ADDs and previous event feed concentrations affected the outflow nitrate-nitrogen concentration in the first 30 min of the current event. Therefore, from this study it is concluded that denitrification within stormwater biofilters occurs mainly during drying periods rather than wetting periods.

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ID Code: 93079
Item Type: Journal Article
Refereed: Yes
Keywords: Antecedent dry days, Nitrate-nitrogen, Stormwater biofilters, Simulated stormwater
DOI: 10.1061/(ASCE)EE.1943-7870.0001043
ISSN: 1943-7870
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 ASCE
Deposited On: 19 Feb 2016 03:59
Last Modified: 25 Feb 2016 10:42

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