Optimisation of the nitrogen retention capacity of stormwater biofiltration systems
2007 (English)In: Techniques et stratégies durables pour la gestion des eaux urbaines par temps de pluie: 6e Conférence internationale, [25-27] juin 2007, Lyon, France, Villeurbanne: Graie , 2007Conference paper (Refereed)
Excess nitrogen in stormwater is a principal cause for eutrophication of many water bodies in the world. Biofilters, which used a vegetated soil media, have been shown to reduce nitrogen concentrations in stormwater, although there is substantial scope to improve their current nitrogen removal performance. This paper explores the nitrogen transformations in biofilters and optimised theirs design to maximise removal. To achieve this, 20 columns were constructed to test a range of submerged anoxic zone (SAZ) depths, to maximise denitrification. The effect of adding a carbon source to act as an electron donor supplement in the filter media was also tested. Nitrate removal of up to 99% was achieved, with removal by columns with added carbon significantly greater, with a mean removal of greater than 90%, whilst the non-carbon columns showed an average 50% nitrate removal. Depth profiles revealed that mineralization is the limiting step of nitrogen removal in the biofilter columns. The results will contribute to guidelines for optimal biofilter design.
Place, publisher, year, edition, pages
Villeurbanne: Graie , 2007.
Research subject Urban Water Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-35878Local ID: a9639180-5184-11dc-959a-000ea68e967bISBN: 9782950933775OAI: oai:DiVA.org:ltu-35878DiVA: diva2:1009132
NOVATECH 2007 : 24/06/2007 - 29/06/2007
Godkänd; 2007; 20070823 (godble)2016-09-302016-09-30Bibliographically approved