Co-optimisation of phosphorus and nitrogen removal in stormwater biofilters: the role of filter media, vegetation and saturated zone
Bonnie J Glaister, Tim D Fletcher, Perran LM Cook, Belinda E Hatt
Water Science & Technology | IWA PUBLISHING | Published : 2014
Biofilters have been shown to effectively treat stormwater and achieve nutrient load reduction targets. However, effluent concentrations of nitrogen and phosphorus typically exceed environmental targets for receiving water protection. This study investigates the role of filter media, vegetation and a saturated zone (SZ) in achieving co-optimised nitrogen and phosphorus removal in biofilters. Twenty biofilter columns were monitored over a 12-month period of dosing with semi-synthetic stormwater. The frequency of dosing was altered seasonally to examine the impact of hydrologic variability. Very good nutrient removal (90% total phosphorus, 89% total nitrogen) could be achieved by incorporating..View full abstract
We appreciate the financial support of Melbourne Water (State Government of Victoria). Special thanks are also extended to Richard Williamson and Tony Brosinsky (Monash University Civil Engineering Hydraulics Laboratory). We acknowledge our partners at Monash University in the School of Biological Sciences, and the School of Chemistry (Water Studies Centre) for support and advice. Fletcher is supported by an ARC Future Fellowship. Two anonymous reviewers are thanked for their constructive comments.