Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2006
Forfattere
Anne Falk ØgaardSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Falk ØgaardSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Falk ØgaardSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Falk ØgaardSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Falk Øgaard Tore KrogstadSammendrag
Det er ikke registrert sammendrag
Forfattere
Erik JonerSammendrag
Som for alle andre produkter som omgir oss er det klart at både råstoffer og produkter som springer ut fra ulike typer nanoteknologi i varierende grad vil ende opp i avfall, jord, vann og sedimenter. Dette åpner for muligheten av at man får en ny type miljøforurensning som vi foreløpig ikke kan se omfanget eller betydningen av.
Forfattere
Mikkel BakkegardSammendrag
Det er ikke registrert sammendrag
Forfattere
Anne Kristine Søvik Bjørn Kløve Kaisa Haikkinen J. Augustin Jari Huttunen J.M. Necki Satu Karjalainen Anu Liikanen Ülo Mander Markku Puustinen S. Teiter P. WachniewSammendrag
The potential atmospheric impact of constructed wetlands (CWs) should be examined as there is a worldwide increase in the development of these systems. Fluxes of N2O, CH4, and CO2 have been measured from CWs in Estonia, Finland, Norway, and Poland during winter and summer in horizontal and vertical subsurface flow (HSSF and VSSF), free surface water (FSW), and overland and groundwater flow (OGF) wetlands. The fluxes of N2O-N, CH4-C, and CO2-C ranged from "2.1 to 1000, "32 to 38 000, and "840 to 93 000 mg m"2 d"1, respectively. Emissions of N2O and CH4 were significantly higher during summer than during winter. The VSSF wetlands had the highest fluxes of N2O during both summer and winter. Methane emissions were highest from the FSW wetlands during wintertime. In the HSSF wetlands, the emissions of N2O and CH4 were in general highest in the inlet section. The vegetated ponds in the FSW wetlands released more N2O than the non-vegetated ponds. The global warming potential (GWP), summarizing the mean N2O and CH4 emissions, ranged from 5700 to 26000 and 830 to 5100 mg CO2-equivalents m"2 d"1 for the four CW types in summer and winter, respectively. The wintertime GWP was 8.5-89.5% of the corresponding summertime GWP, which highlights the importance of the cold season in the annual greenhouse gas release from north temperate and boreal CWs. However, due to their generally small area North European CWs were suggested to represent only a minor source for atmospheric N2O and CH4.
Forfattere
Anne Kristine SøvikSammendrag
Filter beds and constructed wetlands (CWs) treat municipal wastewater through retention of nutrients and particles. Retention of nitrogen (N) in filter beds was studied in the laboratory using columns and meso-scale trenches filled with shellsand and light-weight aggregates (LWA). The objective was to examine whether measuring the natural abundance of "15N in NO3- could be used to estimate denitrification in these systems. In both the columns and the trenches, it was seen that denitrification was more efficient in shellsand and LWA collected from field scale filter beds compared to raw LWA. This was due to the high pH value (about 10) of raw LWA. The enrichment factors (") from the column study was in general lower than values found in laboratory tests of isotope discrimination in denitrification, but similar to " values found for denitrification in groundwater systems. No enrichment factors could be found for the trench study due to simultaneous denitrification and nitrification. When NH4 was partially nitrified in the upper parts of the trench, this diluted the 15N enrichment of NO3- due to denitrification. Thus in systems with high NH4 concentrations, and partial aerobic conditions, the method of natural abundance is not suitable for estimating denitrification.
Forfattere
Anne Kristine Søvik Pål Tore MørkvedSammendrag
Det er ikke registrert sammendrag