TESTING THE POWER LAW ON URBAN WATER AND WASTEWATER PIPELINE NETWORKS / Å teste hypotesen om at ”Power Law” kan knyttes til ledningsnettverk for vann- og avløpssystemer i byer
Active research has been going on to observe and validate the Power Law in physics, computer science, economics, linguistics, sociology, geophysics etc. This paper sets out to test the hypothesis that the Power Law is a feature of water and wastewater pipeline networks in cities. Databases from 30 different municipalities in Norway serve as the […]
Kväverening utan kolkälla / Nitrogen removal without an organic carbon source
Many waste water treatment plants in Sweden needs to improve the nitrogen removal in the coming years in order to fulfill stringent regulatory requirements with respect to nitrogen in the final effluent from today’s level of 15–20 mg/l to 8–10 mg/l. At waste water treatment plants having anaerobic digesters, the nitrogen content in the reject […]
MAPPING OF NON-AQUEOUS PHASE LIQUIDS USING TIME DOMAIN REFLECTOMETRY / Kartering av icke vattenlösliga vätskor med tidsdomän reflektometri
A two-dimensional multi-fluid flow experiment was performed in a container (45 cm x 54 cm x 20 cm) filled with fine sandy soil. A dye stained light nonaqueous phase liquid (LNAPL) was applied in four releases over a rectangular area of 5 x 20 cm at the center of the soil surface. The releases varied […]
Evaluation of using grey water as an alternative irrigation source in Jordan Utvärdering av användandet av gråvatten som en alternativ vattenresurs till bevattning i Jordanien
One option for coping with wasteful uses of fresh water in landscape irrigation is to use the treated greywater (GW). In the present study, an evaluation of a simple treatment system for reusing GW to irrigate green areas, trees, and ornamentals all over the campus in Tafila Technical University (TTU), Jordan, is presented. After 12 […]
POTENTIAL WATER SAVING FROM RAINWATER HARVESTING IN SYRIA / Potentiell vattenbesparing genom insamling av regnvatten i Syrien
Syria, as well as many other countries in the Middle East, faces serious water shortage problems. Available water per capita (AWPC) will dramatically decrease due to climate change, population increase, and water needed for economic growth. Rainwater harvesting can play an important role in increasing available water in Syria. However, the absence of rainwater sewer […]
Om drivkrafter bakom några sjösänkningar i Sverige – exempel från Näsbyholmssjön (Skåne) och Hjälmaren (Närke-Södermanland-Västmanland)/ The driving forces behind some lake lowerings in Sweden – examples from Lake Näsbyholmssjön and Lake Hjälmaren
During the period 1840–1940, a large number of lakes in Sweden were drained or the water tables lowered. The driving forces behind these projects are discussed and the most important reasons behind them identified. A change in land ownership from collective towards private and undisputed control stimulated farmers to invest in improvements in the arable […]
Comparison between two techniques for sludge dewatering – trials at Sjölunda and Klagshamn WWTPs
The cost for disposal of the dewatered sludge is dominating among the operational costs for sludge handling at municipal wastewater treatment plants. This, in turn, is affected by the dryness of the sludge. In this paper the results from parallel trials with two different dewatering techniques, at two different wastewater treatment plants (Sjölunda and Klagshamn […]