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Field-scale denitrifying woodchip bioreactor treating high nitrate mine water at low temperatures
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrologi)ORCID iD: 0000-0002-0311-8368
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrologi)ORCID iD: 0000-0002-7561-757X
2017 (English)In: Mine water and circular economy / [ed] Wolkersdorfer C, Sartz L, Sillanpää M, Häkkinen A, 2017, Vol. 2, 1087-1094 p.Conference paper, Published paper (Refereed)
Abstract [en]

A field-scale woodchip bioreactor was installed at the Kiruna iron ore mine (northern Sweden) for the removal of NO3- in mine and process water originating from the use of ammonium nitrate based explosives. Over a period of two years, the woodchip bioreactor removed an average incoming NO3- concentration of 22.0±0.3 mg N L-1 to below detection limits (0.06 mg N L-1) at bioreactor temperatures above 5°C and hydraulic residence times between 1.9-2.6 days. As the hydraulic residence time in the system was decreased to 1 day and/or the bioreactor temperature decreased to below 5°C, NO3- removal was incomplete. The bioreactor acted as an overall sink and source of NO2- and NH4+, respectively, with low level ammonium production (< l mg N L-1) observed during the test period. The direct application of a woodchip bioreactor for the removal of NO3- in leachate produced from waste rock deposits in subarctic climates is limited by the variability and timing of leachate production.

Place, publisher, year, edition, pages
2017. Vol. 2, 1087-1094 p.
National Category
Environmental Sciences Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-329617OAI: oai:DiVA.org:uu-329617DiVA: diva2:1142472
Conference
13th IMWA Congress
Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2017-09-19

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