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Urine separating wastewater systems : experiences of design and nitrogen conservationJohansson, Erica January 1999 (has links)
Urine separating (US) wastewater systems, where urine is collected and used as a fertiliser, may be a strategy to achieve a high degree of nutrient recycling from human waste to agriculture. The Swedish experiences of US systems show that the design of the toilets and the sewers are of great importance to achieve a working system. One study of the US system in the eco-village in Björsbyn also shows that special attention should be given to avoidance of leakage of water into the urine sewers. During storage of urine the main nitrogen constituent, urea, decomposes to ammonium. Thus, there is a risk nitrogen losses as ammonia evaporation. Several factors concerning the decomposition of urea has been studied in laboratory experiments. A one-time dosage of acid in the beginning of a storage cycle could inhibit the urea decomposition. One strategy to reduce the amount of urine solution produced in a US system may be to use nitrification in combination with drying. Results from a laboratory experiment showed that the method has a potential. However, the system used has to be modified in order to minimise the nitrogen losses. / Godkänd; 1999; 20070403 (ysko)
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Thermal response test : in situ measurements of thermal properties in hard rockGehlin, Signhild January 1998 (has links)
In-situ determination of thermal properties in bedrock is important for the sizing of larger BTES systems. In-situ values of thermal conductivity may reduce required borehole length up to 30%. This thesis treats a new mobile thermal response test equipment (TED), developed in Luleå, Sweden, 1995-98. TED is set up on a small trailer, and is tried out on groundwater filled boreholes, fitted with single and double U-loop piping. It has been used at several commercial borehole direct cooling systems for telephone switching stations in Sweden, and on test-holes in a well documented closed down heat store in Luleå. The response tests show good accuracy and reliability of the measured thermal conductivity and thermal resistance provided good insulation of the equipment. The tests take into account the interaction of the bedrock with the duct piping and filling, the borehole geometry and groundwater and is a valuable tool for pre-investigations for BTES. / Godkänd; 1998; 20070404 (ysko)
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Dewatering of wastewater sludge by natural air dryingMarklund, Stefan January 1997 (has links)
Godkänd; 1997; 20070418 (ysko)
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Atmospheric icing : failure studies and ice load predictions on masts by weather station dataSundin, Eva January 1995 (has links)
Godkänd; 1995; 20080330 (ysko)
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Numerisk modellering av strömningsförhållanden över horisontellt homogena ytor med stora råhetselementHäggkvist, Kenneth January 1988 (has links)
No description available.
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Brash ice behaviour in frequented ship channelsSandkvist, Jim January 1986 (has links)
No description available.
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An investigation of components in wastewater nutrients management : natural sludge dewatering and storage of urineHellström, Daniel January 1996 (has links)
Godkänd; 1996; 20080328 (ysko)
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Water film solar collectors : Solar heat from asphalt and roof surfacesSöderlund, Monika January 1987 (has links)
No description available.
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Ice accretion and ice adhesion to polymer materialAndersson, Lars-Olof January 1993 (has links)
No description available.
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Frazil ice evolution on open channelsHammar, Lars January 1994 (has links)
<p>Godkänd; 1994; 20080330 (ysko)</p>
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