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Ecosystem age affects nitrate removal in created wetlands
Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
2018 (engelsk)Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
Abstract [en]

This study investigates the effect of ecosystem age on the nitrate removal efficiency, nitrate removal rate and first-order area-based removal rate coefficients (both with and without temperature adjustment) of created wetlands. Data was collected from the first to eleventh year after wetland creation in an experimental wetland facility in south-west Sweden. The 18 small (22-29 m2) free water surface wetlands were divided into three groups based on initial planting: EVW (emergent vegetation wetlands), SVW (submerged vegetation wetlands) and CW (unplanted control wetlands). Summer and winter values from the 11 studied years were analysed separately in the repeated measures ANOVA. Over these 11 years the mean nitrate removal efficiency was 12 % and the mean nitrate removal rate was 0.17 g m-2 d-1. Mean removal rate coefficient (K) was 0.020 g d-1 and mean temperature adjusted removal rate coefficient (Ka) was 0.042 g d-1. The best performing wetlands were those initially planted with, and after four years almost completely covered by, emergent vegetation (EVW). This study indicates a positive correlation between wetland age and nitrate removal potential. It further indicates aging may be hastened by initial planting of wetland vegetation.

sted, utgiver, år, opplag, sider
2018. , s. 19
Emneord [en]
Nitrogen, retention, denitrification, constructed wetland, vegetation
HSV kategori
Identifikatorer
URN: urn:nbn:se:hh:diva-37233OAI: oai:DiVA.org:hh-37233DiVA, id: diva2:1222104
Fag / kurs
Environmental Science
Utdanningsprogram
Master's Programme in Applied Environmental Science
Veileder
Examiner
Tilgjengelig fra: 2018-06-21 Laget: 2018-06-20 Sist oppdatert: 2018-06-21bibliografisk kontrollert

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