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Retrofitting a Saturated Zone (RSAZ) in stormwater biofilters: impact on pollutants removal
Centre for Water Sensitive Cities, Department of Civil Engineering, Monash University.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Monash University, Melbourne, VIC.
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2012 (English)In: WSUD 2012: Water Sensitve Urban Design - 21 - 23 February 2012, Melbourne Cricket Ground : building the water sensitve community, Barton: Institution of Engineers, Australia , 2012Conference paper, Published paper (Refereed)
Abstract [en]

Stormwater biofilters are good nitrogen control measures. However there are lots of cases in practice, where they failed to meet nitrogen removal targets mainly due to their poor design. Retrofitting a Saturated Zone (SAZ) into a poorly performing biofilters, could be a solution since SAZ will both enhance nitrate removal and assure that plants are well water. The aim of this study was to evaluate the influence of a retrofitted SAZ on nitrogen removal in biofilters. Fifteen mature biofilter columns planted with Dianella revoluta and Microleana stipoides were used since they showed the poorest nitrogen removal of a range of plant species (leaching up to -250% of TN), as well as Carex appressa biofilter columns that achieved removal of TN of over 50%. These columns where sampled over a year before retrofitting the 450mm deep SAZ, and 3 months after the retrofitting. The samples analysed for TSS, total nitrogen (TN) and the nitrogen species NH4 and NOx (nitrite and nitrate), total phosphorus (TP) and filterable reactive phosphorus (FRP), and Cu, Pb and Zn. RSAZ columns showed up to 450% increase in NOx removal capacity for Dianella and 360% for Microlaena, while the control Carex columns enhanced their NOx removal by 35%. Unsurprisingly, TP removal (FRP driven) reduced in all treatments due to presence of organic matter in filter media within the RSAZ. This study showed that potentially we can start retrofitting SAZ into poorly performing biofilters in practice, to make them more effective in stormwater pollution control practice.

Place, publisher, year, edition, pages
Barton: Institution of Engineers, Australia , 2012.
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-39973Local ID: eed35bfd-1cae-4768-89c2-e3d86b86a0caISBN: 9780858258952 (electronic)OAI: oai:DiVA.org:ltu-39973DiVA: diva2:1013493
Conference
International Conference on Water Sensitive Urban Design : 21/02/2012 - 23/02/2012
Note
Godkänd; 2012; Bibliografisk uppgift: CD-ROM; 20120619 (andbra)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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