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Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors.

ARAN - Access to Research at NUI Galway

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dc.contributor.author Healy, Mark G.
dc.contributor.author Ibrahim, Tristan
dc.contributor.author Lanigan, Gary
dc.contributor.author Serrenho, Ana
dc.contributor.author Fenton, Own
dc.date.accessioned 2012-04-05T16:56:08Z
dc.date.available 2012-04-05T16:56:08Z
dc.date.issued 2012-01-01
dc.identifier.citation Healy, M.G., Ibrahim, T.G., Lanigan, G., Serrenho, A., Fenton, O. 2012. Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors. Ecological Engineering 40: 198-209. en_US
dc.identifier.uri http://hdl.handle.net/10379/2641
dc.description.abstract Laboratory denitrifying bioreactors, which use an organic carbon (C) rich media to enhance microbial reduction of nitrate (NO3-) to nitrogen (N) gases, are used worldwide to protect surface and groundwater. To highlight potential adverse effects of denitrifying bioreactors, nitrate removal rates (g NO3-N m-3 d-1 removed), nitrate removal efficiencies (% removed minus production of other N species) and release of greenhouse gases and solutes (ammonium, phosphorus (P) and organic carbon (C)) were compared in this study using different media: lodgepole pine woodchips (LPW), cardboard, lodgepole pine needles (LPN), barley straw (BBS) and a soil control. Results showed that nitrate removals were consistently >99% for all media for initial leaching and steady-state periods. When pollution swapping was considered, this ranged from 67% for LPW to 95% for cardboard. Sustained P releases over the threshold for the occurrence of eutrophication were measured in all media. Greenhouse gas emissions were dominated by carbon dioxide (CO2) and methane (CH4) fluxes with little nitrous oxide (N2O) release due to the anaerobic conditions prevalent within the bioreactors. Comparisons of different media, under steady-state conditions, showed that C fluxes were highest for cardboard and BBS bioreactors. Carbon fluxes from cardboard bioreactors ranged from 11.6 g C m-2 d-1 to 13.9 g C m-2 d-1, while BBS emissions ranged from 3.9 g C m-2 d-1 to 4.4 g C m-2 d-1. These C emissions were correlated with the total surface area exposed within the media. Such investigations highlight the need to consider pollution swapping during the initial leaching period and should improve design criteria for field-scale bioreactors used to mitigate shallow groundwater NO3 -. en_US
dc.format application/pdf en_US
dc.language.iso en en_US
dc.publisher Ecological Engineering en_US
dc.subject Civil Engineering en_US
dc.subject Denitrification bioreactors en_US
dc.subject Denitrification en_US
dc.subject Groundwater nitrate en_US
dc.title Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors. en_US
dc.type Article en_US
dc.identifier.doi 10.1016/j.ecoleng.2011.12.010
dc.local.publishedsource http://dx.doi.org/10.1016/j.ecoleng.2011.12.010 en_US
dc.description.peer-reviewed peer-reviewed en_US
dc.contributor.funder Department of Agriculture, Fisheries and Food en_US

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