Long-term nitrate removal in a denitrification wall

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dc.contributor.authorLong, Lauren M.
dc.contributor.authorSchipper, Louis A.
dc.contributor.authorBruesewitz, Denise A.
dc.date.accessioned2011-03-02T01:24:36Z
dc.date.available2011-03-02T01:24:36Z
dc.date.issued2011
dc.description.abstractDenitrification walls are a low-cost approach for removing excess nitrate (NO₃⁻) from shallow groundwater. Denitrification walls need to be maintenance-free for a number of years to remain cost effective, but little is known about the longevity of these walls. In this study, a denitrification wall constructed on a New Zealand dairy farm in 1996 was monitored to determine NO₃⁻ removal by the wall 14 years after installation. After 14 years, the denitrification wall removed 92% of NO₃⁻ input, which ranged from 2.2 to 3.7 mg N L−1. The NO₃⁻ input to the wall had decreased since first constructed, which was attributed to a change in upslope irrigation practices on the farm. Denitrifying enzyme activity (DEA) remained high after 14 years and the wall remained NO₃⁻ limited. However, total C and microbial biomass C in the wall had decreased by approximately half, while available C remained relatively constant since year 2. By applying a first order decay curve, it was determined that total C in the denitrification wall would not be depleted for 66 years, but it is unclear at what amount of total C that denitrification would become limited. This long-term study suggested that denitrification walls are cost effective solutions for remediating groundwater NO₃⁻ pollution, as they can be effective for a number of years without any maintenance.en_NZ
dc.identifier.citationLong, L.M., Schipper, L.A. & Bruesewitz, D.A. (2011). Long-term nitrate removal in a denitrification wall. Agriculture, Ecosystems & Environment, 140(3-4),514-520.en_NZ
dc.identifier.doi10.1016/j.agee.2011.02.005en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5117
dc.language.isoen
dc.publisherElsevieren_NZ
dc.relation.isPartOfAgriculture, Ecosystems & Environmenten_NZ
dc.subjectDEAen_NZ
dc.subjectavailable Cen_NZ
dc.subjectbioreactoren_NZ
dc.subjectlong-term studyen_NZ
dc.subjectgroundwateren_NZ
dc.titleLong-term nitrate removal in a denitrification wallen_NZ
dc.typeJournal Articleen_NZ
pubs.begin-page514en_NZ
pubs.elements-id35761
pubs.end-page520en_NZ
pubs.issue3-4en_NZ
pubs.volume140en_NZ
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