Sökning: "total phosphorus"

Visar resultat 11 - 15 av 115 avhandlingar innehållade orden total phosphorus.

1. 11. SBR-technology - use and potential applications for treatment of cold wastewater

   Författare :Stig Morling; Elzbieta Plaza; Jörgen Hanaeus; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Intermittent operation; Water temperature; nitrogen; phosphorus; SBR; reaction rates; Environmental engineering; Miljöteknik;

   Sammanfattning : Biological nutrient removal is used as an indicator of SBR performance at nine different SBRplants operated for a long period at low water temperatures (5 – 10oC). Typically needed aeratedSRT (Solids Residence Time) for complete nitrification is found to be in the range of 6 – 10 days. LÄS MER

3. 12. Spatial and temporal dynamics of nutrients in two agricultural catchments in southeast Sweden

   Författare :Andreas Milver; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; HYPE-model; phosphorus; nitrogen; arable land; discharge; water quality modeling; snowmelt; nutrient transport; local information;

   Sammanfattning : Many lakes and coast areas in Sweden and all over the globe suffer from eutrophication, caused by an overload of phosphorus (P) and nitrogen (N). In Sweden these emissions from point sources, e.g. LÄS MER

4. 13. Consumption patterns and excretion in aquatic food websenrichment

   Författare :Anders Persson; Enhet akvatisk ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrobiology; trophic interactions; translocation; biomanipulation; enrichment; phosphorus; model; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi;

   Sammanfattning : This thesis links biogeochemical cycling to classical ecology. Predictions derived from food chain theory, based on Lotka-Volterra type of interactions, were tested in aquatic environments with the main hypothesis that consumers affect lower levels of organization by both predation and excretion of limiting nutrients. LÄS MER

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

   Författare :Anna Norström; Gunnel Dalhammar; Jörgen Hanaeus; KTH; []
   Nyckelord :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

7. 15. Assessment of Raw Materials in Stainless Steelmaking-Their Energy Consumption and Greenhouse Gas Emission

   Författare :Wei Wenjing; Anders Tilliander; Peter Samuelsson; Pär Jönsson; Ye Guozhu; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; static process model; mass and energy balance; molybdenum; nickel; phosphorus; stainless steel; life cycle assessment; GHG emission; energy consumption; statisk procesmodell; mass- och energibalans; molybden; nickel; fosfor; rostfritt stål; livscykelanalys; växthusgasutsläpp; energiförbrukning; Metallurgical process science; Metallurgisk processvetenskap;

   Sammanfattning : In stainless steelmaking, around 68% of the total greenhouse gas emissions come from the processing of raw materials. Thus, it is important for steelmakers to make efforts together with their raw material suppliers to implement low-carbon initiatives. To facilitate such initiatives, assessment of raw materials will provide guidance. LÄS MER