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Denitrification in a low-temperature bioreactorsystem at two different hydraulic residence times: laboratory column studies
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Geohydrology)
2017 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 38, no 11, 1362-1375 p.Article in journal (Refereed) Published
Abstract [en]

Nitrate removal rates in a mixture of pine woodchips and sewage sludge were determined in laboratory column studies at 5°C, 12°C, and 22°C, and at two different hydraulic residence times (HRTs; 58.2–64.0 hours and 18.7–20.6 hours). Baffles installed in the flow path were tested as a measure to reduce preferential flow behavior, and to increase the nitrate removal in the columns. The nitrate removal in the columns was simulated at 5°C and 12°C using a combined Arrhenius-Monod equation controlling the removal rate, and a first-order exchange model for incorporation of stagnant zones. Denitrification in the mixture of pine woodchips and sewage sludge reduced nitrate concentrations of 30 mg N L−1 at 5°C to below detection limits at a HRT of 58.2–64.0 hours. At a HRT of 18.7–20.6 hours, nitrate removal was incomplete. The Arrhenius frequency factor and activation energy retrieved from the low HRT data supported abiochemically controlled reaction rate; the same parameters, however, could not be used to simulate the nitrate removal at high HRT. The results show an inversely proportional relationship between the advection velocity and the nitrate removal rate, suggesting that bioreactor performance could be enhanced by promoting low advection velocities.

Place, publisher, year, edition, pages
2017. Vol. 38, no 11, 1362-1375 p.
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-303686DOI: 10.1080/09593330.2016.1228699ISI: 000400464400004PubMedID: 27603564OAI: oai:DiVA.org:uu-303686DiVA: diva2:972721
Projects
MiNing
Funder
VINNOVA, P31054-1
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-06-27Bibliographically approved

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Publisher's full textPubMedhttp://dx.doi.org/10.1080/09593330.2016.1228699

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Herbert, Roger

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