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Anthropogenic nitra...
Anthropogenic nitrate attenuation versus nitrous oxide release from a woodchip bioreactor
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White, S. A. (författare)
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Morris, S. A. (författare)
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Wadnerkar, P. D. (författare)
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Woodrow, R. L. (författare)
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Tucker, J. P. (författare)
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Holloway, C. J. (författare)
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Conrad, S. R. (författare)
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Sanders, C. J. (författare)
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Hessey, S. (författare)
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- Santos, Isaac R. (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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(creator_code:org_t)
- Elsevier BV, 2022
- 2022
- Engelska.
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Ingår i: Environmental Pollution. - : Elsevier BV. - 0269-7491. ; 300
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Nitrogen loss via overland flow from agricultural land use is a global threat to waterways. On-farm denitrifying woodchip bioreactors can mitigate NO3− exports by increasing denitrification capacity. However, denitrification in sub-optimal conditions releases the greenhouse gas nitrous oxide (N2O), swapping the pollution from aquatic to atmospheric reservoirs. Here, we assess NO3−-N removal and N2O emissions from a new edge-of-field surface-flow bioreactor during ten rain events on intensive farming land. Nitrate removal rates (NRR) varied between 5.4 and 76.2 g NO3−-N m−3 wetted woodchip d−1 with a mean of 30.3 ± 7.3 g NO3−-N m−3. The nitrate removal efficiency (NRE) was ∼73% in ideal hydrological conditions and ∼18% in non-ideal conditions. The fraction of NO3−-N converted to N2O (rN2O) in the bioreactor was ∼3.3 fold lower than the expected 0.75% IPCC emission factor. We update the global bioreactor estimated Q10 (NRR increase every 10 °C) from a recent meta-analysis with previously unavailable data to >20 °C, yielding a new global Q10 factor of 3.1. Mean N2O CO2-eq emissions (431.9 ± 125.4 g CO2-eq emissions day−1) indicate that the bioreactor was not significantly swapping aquatic NO3− for N2O pollution. Our estimated NO3−-N removal from the bioreactor (9.9 kg NO3−-N ha−1 yr−1) costs US$13.14 per kg NO3−-N removed and represents ∼30% NO3−-N removal when incorporating all flow and overflow events. Overall, edge-of-field surface-flow bioreactors seem to be a cost-effective solution to reduce NO3−-N runoff with minor pollution swapping to N2O. © 2022
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- Climate change
- Greenhouse gases
- Horticulture
- Remediation
- Water quality
- Agriculture
- Bioconversion
- Bioreactors
- Carbon dioxide
- Cost effectiveness
- Denitrification
- Land use
- Nitrogen oxides
- Anthropogenics
- Greenhouses gas
- N removal
- Nitrates removal
- Nitrogen loss
- Nitrous oxide
- Overland flow
- Removal rate
- Surface flow
- Wood chip
- Nitrates
- nitrate
- nitrogen
- rain
- agricultural land
- Article
- carbon dioxide equivalent
- controlled study
- cost effectiveness analysis
- ecosystem restoration
- human impact (environment)
- hydrology
- nitrous oxide emission
- surface runoff
- water sampling
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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White, S. A.
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Morris, S. A.
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Wadnerkar, P. D.
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Woodrow, R. L.
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Tucker, J. P.
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Holloway, C. J.
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visa fler...
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Conrad, S. R.
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Sanders, C. J.
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Hessey, S.
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Santos, Isaac R.
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visa färre...
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