Sökning: "Humic substances"

Visar resultat 1 - 5 av 19 uppsatser innehållade orden Humic substances.

  1. 1. Coupling between iron and humic substances in a land-sea transitional zone in the northern Baltic Sea

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Anna Osterman; [2023]
    Nyckelord :Iron; Humic substances; Dissolved organic carbon; Baltic Sea; Rivers;

    Sammanfattning : In marine ecosystems around the world, iron (Fe) is a well-studied and important trace element which has been found to stimulate phytoplankton and cyanobacteria growth, as well as limit nitrogen fixation and being essential for Legionella pneumophila which is known as the main cause of Legionnaires’ disease. Fe also contributes to the brownification of freshwater and has recently been documented to increase in concentration in rivers in Sweden. LÄS MER

  3. 2. The potential use of black soldier fly larvae residue as a fertilizer

    Master-uppsats, SLU/Dept. of Agricultural Biosystems and Techology

    Författare :An-Marthe Ingelaere; [2023]
    Nyckelord :organic waste; fertilizer; black soldier fly; residue; physico-chemical characteristics; sub-Saharan Africa; socio-economic constraints;

    Sammanfattning : In sub-Saharan Africa (SSA), the primary constraint of agriculture productivity has consistently been ascribed to soil fertility. A common approach to improve soil fertility is the use of fertilizers, both organic and inorganic. Though recently interest is increasing in the use of newer alternatives like biostimulants. LÄS MER

  4. 3. Frankia – ett släkte kvävefixerande bakterier : Biodiversitet, förekomst i jord och frö, samt påverkan på tillväxt hos havtorn

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Maria Nygren; [2021]
    Nyckelord :Frankia; Sea buckthorn; Nitrogen-fixation;

    Sammanfattning : This study aimed to describe the biodiversity of the nitrogen-fixing symbiotic bacteria Frankia, to investigate the occurrence of Frankia in soil and seeds, and finally test the effect of a Frankia symbiosis on growth rate on Sea buckthorn (Hippophae rhamnoides) in an experiment. Data from the high-quality ribosomal gene database SILVA was used to reconstruct phylogenetic trees that revealed a genetic diversity in the genus that includes more strains than 16 described species so far. LÄS MER

  5. 4. Patterns and factors affecting brownification in a boreal river

    Master-uppsats, Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Författare :Emil Winqvist; [2021]
    Nyckelord :Bolmen; brownification; precipitation; discharge; sulfur deposition; land use; trend analysis; Technology and Engineering;

    Sammanfattning : During the last decades a brownification of the lakes and streams in the northern hemisphere has been observed. The change has been attributed to an increase of organic content in the water, leached from the top soil layers, called humic substances. LÄS MER

  7. 5. Optimisation of a small-scale ultrafiltration system for separation of humic substances from surface water

    Master-uppsats, KTH/Kemiteknik

    Författare :Nadia Nikzad; [2021]
    Nyckelord :Ultrafiltration; online-coagulation; pH; reaction time; coagulant dosage; NOM; humic substances; Ultrafiltrering; online-koagulation; pH; reaktionstid; koaguleringsdos; NOM; humusämnen;

    Sammanfattning : Norrvatten är den fjärde största dricksvattenproducenten i Sverige. De producerar och distribuerar dricksvatten till 14 kommuner norr om Stockholm. Norrvatten har under en tid studerat alternativa processer för att optimera och öka produktionskapaciteten och effektiviteten i deras dricksvattenreningsverk vid Görvälnverket. LÄS MER