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Modelling nitrogen transformations in waters receiving mine effluents
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-4208-345X
Vise andre og tillknytning
2011 (engelsk)Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 409, nr 21, s. 4585-4595Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper presents a biogeochemical model developed for a clarification pond receiving ammonium nitrogen rich discharge water from the Boliden concentration plant located in northern Sweden. Present knowledge about nitrogen (N) transformations in lakes is compiled in a dynamic model that calculates concentrations of the six N species (state variables) ammonium-N (Nam), nitrate-N (Nox), dissolved organic N in water (Norg), N in phytoplankton (Npp), in macrophytes (Nmp) and in sediment (Nsed). It also simulates the rate of 16 N transformation processes occurring in the water column and sediment as well as water–sediment and water–atmosphere interactions. The model was programmed in the software Powersim using 2008 data, whilst validation was performed using data from 2006 to 2007. The sensitivity analysis showed that the state variables are most sensitive to changes in the coefficients related to the temperature dependence of the transformation processes. A six-year simulation of Nam showed stable behaviour over time. The calibrated model rendered coefficients of determination (R2) of 0.93, 0.79 and 0.86 for Nam, Nox and Norg, respectively. Performance measures quantitatively expressing the deviation between modelled and measured data resulted in values close to zero, indicating a stable model structure. The simulated denitrification rate was on average five times higher than the ammonia volatilisation rate and about three times higher than the permanent burial of Nsed and, hence, the most important process for the permanent removal of N. The model can be used to simulate possible measures to reduce the nitrogen load and, after some modification and recalibration, it can be applied at other mine sites affected by N rich effluents.

sted, utgiver, år, opplag, sider
2011. Vol. 409, nr 21, s. 4585-4595
HSV kategori
Forskningsprogram
Landskapsekologi; Tillämpad geologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-14523DOI: 10.1016/j.scitotenv.2011.07.024ISI: 000295765200012PubMedID: 21816451Scopus ID: 2-s2.0-80052547209Lokal ID: de415e0a-6958-4d69-9c9b-27b5a0ca9edaOAI: oai:DiVA.org:ltu-14523DiVA, id: diva2:987496
Merknad
Validerad; 2011; 20110808 (ysko)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Chlot, SaraWiderlund, AndersSiergieiev, DmytroEcke, FraukeHusson, EvaÖhlander, Björn

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