Sökning: "denitrification"

Visar resultat 1 - 5 av 116 uppsatser innehållade ordet denitrification.

  1. 1. Greenhouse gas emissions from peat soil thawing in spring : a comparison between fertilized and unfertilized soil

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Fanny Otterlin Karlsson; [2024]
    Nyckelord :agricultural soil; carbon dioxide; freeze-thaw cycles; nitrous oxide; soil temperature; water content;

    Sammanfattning : Peat soils drained for agriculture and forestry contribute to a significant amount of greenhouse gas emissions. Nitrous oxide is a greenhouse gas with high warming potential and agriculture in general accounts for about 70 % of nitrous oxide emissions. LÄS MER

  3. 2. The potential nitrous oxide emissions in a permanent grassland chronosequence

    Kandidat-uppsats, SLU/Dept. of Forest Mycology and Plant Pathology

    Författare :Sandra Lillsjö Kronblad; [2023]
    Nyckelord :nitrous oxide emission; permanent grasslands; denitrification; nitrous; reen house gas; agriculture;

    Sammanfattning : As a part of a larger project (Belowground biodiversity of grasslands – conservation needs and potential to promote sustainable agriculture), this study aims to investigate potential nitrous oxide (N2O) emissions and microbial gene abundances needed for the production (nirS and nirK) and reduction (nosZI and nosZII) of nitrous oxide in soil of permanent grasslands of various age. Thegrasslands have at different times been converted to permanent grasslands and are of interest because of the possibility to shed more light about the passage of time’s affects on the soil microbialcommunities and their activity. LÄS MER

  4. 3. Utvärdering av driftdata i fullskala för minimering av lustgasutsläpp på Henriksdals Reningsverk

    Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

    Författare :Erika Forsén; [2023]
    Nyckelord :Nitrous oxide; nitrification; denitrification; greenhouse gas; biological treatment; ammonium feedback control; oxygen set-point; nitrate recirculation; nitrite; nitrate; ammonium; wastewater treatment plant; nitrous oxygen production; Lustgas; nitrifikation; växthusgas; biologisk rening; ammoniumåterkoppling; syrebörvärden; nitratrecirkulation; nitrit; nitrat; ammonium; avloppsreningsverk; lustgasproduktion; denitrifikation;

    Sammanfattning : Lustgas är en växthusgas, ca 300 gånger mer potent än koldioxid och som har potential att bryta ned ozonlagret med sin livslängd på 120 år i atmosfären. Lustgasutsläppen beräknas ha ökat med mellan 20–30% sedan förindustriell tid vilket tros bero på en ökad användning av konstgödsel i jordbrukssektorn men en del av all lustgas som bildas kommer från avloppsreningsverk vilka står för ca 1,6% av lustgasavgången till atmosfären där Henriksdals reningsverk bidrar med lustgasproduktion. LÄS MER

  5. 4. Modelling the full-scale N2O emissions from wastewater treatment plants for identifying mitigation strategies

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Naga Deepika Peddamudium; [2023]
    Nyckelord :Modelling; simulation; ASM2dISS; N2O production pathways; N2O emission factor; mitigation strategies; water and environmental engineering; Technology and Engineering;

    Sammanfattning : Nitrous oxide (N2O) emissions, which primarily originate from the biological nitrogen removal process, dominate the release of greenhouse gases (GHGs) in wastewater treatment plants (WWTPs). N2O production occurs through dynamic microbial pathways that have a significant impact on the environment compared with other GHG emissions. LÄS MER

  7. 5. Some Like It Hot: Pre-heating Prior to Bioreactor Treatment Enhances Nitrogen Removal From Mine Drainage

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Laura Nina Bettoni; [2022]
    Nyckelord :denitrification; nitrate removal; temperature; woodchip bioreactor; waste rock leachate;

    Sammanfattning : Ammonium-nitrate based explosives (NH4NO3) used within the operations of Kiruna iron ore mine release nitrate (NO3-) into the environment, potentially having adverse effects on local river-systems. One way of reducing NO3- impacts to the environment is through a woodchip denitrifying bioreactor (DBR). LÄS MER