Sökning: "biological nitrogen removal"

Visar resultat 1 - 5 av 53 avhandlingar innehållade orden biological nitrogen removal.

  1. 1. Nitrogen removal in treatment wetlands : Factors influencing spatial and temporal variations

    Författare :Sofia Kallner Bastviken; Karin Sundblad-Tonderski; Jos Verhoeven; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Wetlands; denitrification; macrophytes; nitrogen; nitrification; model; treatment wetlands; potential denitrification; Biology; Biologi;

    Sammanfattning : Decreasing the nitrogen transport from land to surrounding seas is a major task throughout the world to limit eutrophication of the coastal areas. Several approaches are currently used, including the establishment of wetlands, to decrease the transport of nitrogen. LÄS MER

  2. 2. Treatment of domestic wastewater using microbiological processes and hydroponics in Sweden

    Författare :Anna Norström; Gunnel Dalhammar; Jörgen Hanaeus; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Microbiology; biological; hydroponics; microbial composition; nitrogen; organic matter; phosphorus; small scale; theoretical energy requirements; wastewater treatment.; Mikrobiologi; Microbiology; Mikrobiologi;

    Sammanfattning : Conventional end-of-pipe solutions for wastewater treatment have been criticized from a sustainable view-point, in particular regarding recycling of nutrients. The integration of hydroponic cultivation into a wastewater treatment system has been proposed as an ecological alternative, where nutrients can be removed from the wastewater through plant uptake; however, cultivation of plants in a temperate climate, such as Sweden, implies that additional energy is needed during the colder and darker period. LÄS MER

  3. 3. Developing and optimizing processes for biological nitrogen removal from tannery wastewaters in Ethiopia

    Författare :Seyoum Leta; Gunnel Dalhammar; Jes Ia Cour Jenson; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Ecology; biological nitrogen and supphide removal; dntififying bacteria; nitrade-reducing; sulphuroxidizing bacteria; nitrate uptake rate; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Sammanfattning : In Ethiopia industrial effluents containing high contents of organic matter, nitrogen and heavy metals are discharged into inland surface waters with little or no pre-treatment. Significant pollution concerns related to these effluents include dissolved oxygen depletion, toxicity and eutrophication of the receiving waters. LÄS MER

  4. 4. Nitrogen transformations in wetlands: Effects of water flow patterns

    Författare :Torbjörn Davidsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; Hydrobiology; hydrology; infiltration; subsurface flow; surface flow; wetland; nitrogen; Denitrification; mineralization; nitrification; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

    Sammanfattning : In this thesis, I have studied nitrogen turnover processes in watermeadows. A watermeadow is a wetland where water infiltrates through the soil of a grassland field. LÄS MER

  5. 5. Greenhouse gas production in nitrogen removal wetlands

    Författare :Johanna Stadmark; Biologiska institutionen; []

    Sammanfattning : Nitrogen removal wetlands are constructed in agricultural areas as a measure to reduce the amount of non-point source nitrogen that reaches coastal areas. Methane and nitrous oxide, two greenhouse gases, are produced under anaerobic conditions and an increased amount of waterlogged areas will therefore increase the potential emission of these gases. LÄS MER