TEKNISKA MÖJLIGHETER ATT FÖRBÄTTRA VÅRA VA-SYSTEM / Technical Possibilities to Improve Our Water Supply and Sewerage Systems
The paper describes the technical improvements which can be effected in our existing water supply and sewerage networks in order to secure the present function demands regarding public health and environment. A substantial development work has been accomplished in this field during the later years and ongoing R&D projects are described. At present there are […]
GNESTA VATTENFÖRSÖRJNING – SAMSPEL MED NATUREN FÖR GODARE VATTEN / Gnesta Water Treatment – a Process Intergrated with Nature for Higher Quality
Upgrading existing water treatment plants includes evaluating possibilities lo get a new raw water source. Both quality and quantity can be increased. The natural resources should be regarded as possible stages in a process. It requires a coordination of knowledges in geohydrology and water process engineering. Upgrading Gnesta Water Treatment Plant is a good example […]
KVÄVEUTSLÄPP VID TUNNELDRIFT FÖR JÄRNVÄG I BOTKYRKA KOMMUN / Nitrogen Emission by Tunnelwork for Railway in Botkyrka Parish, Sweden
Tunnelwork for the new railway through Botkyrka parish has shown to generate a large nitrogen emission to water recipients. Tot-N concentrations over 50,000 ìg/l have been measured in water from the tunnel outlet. The maximum amount of nitrogen emitted to water recipients as NH3, NO2 and NO3 from a tunnellength of approx 4.8 km is […]
KVÄVEREDUKTION VID ÖVERSILNING / Nitrogen Reduction on Inundated Meadows
Inundation of meadows is an old farming system, where the water from a river is used to flood the nearby meadows during a number of days, in order to increase the production. During 1991 it has been tested, in two places in Scania (the southernmost part of Sweden), as a system for removing nitrogen from […]
OM NITRIFIERANDE BAKTERIER / On the Role of Nitrifying Bacteria
The composition of the nitrifying microflora may vary considerably between different sewage treatment plants. The taxonomy of the nitrifying bacteria and the conditions needed for nitrification are outlined. Present and future methods for the detection of nitrifiers and the assessment of nitrification inhibition are discussed.
KOMBINERAD BIOLOGISK FOSFOR- OCH KVÄVEAVSKILJNING STUDIER I PILOTSKALA / Combined Biological Phosphorus and Nitrogen Removal. Pilot Plant Studies
Combined biological phosphorus and nitrogen removal is being studied in a cooperative project involving the Department of Water and Environmental Engineering at Lund Institute of Technology and Sjölunda sewage treatment plant in Malmö. The project aims at finding out the lowest effluent concentrations of phosphorus and nitrogen that can be obtained in a combined process. […]
CONCENTRATION OF HEAVY METALS IN SUPERFICIAL LAKE SEDIMENTS OF PECHENGA DISTRICT, MURMANSK REGION, RUSSIA
The aim of the paper is an attempt to describe the ecological state of water objects on the basis of heavy metals concentrations in the superficial sediments of six lakes of Pechenga district of Murmansk region, situated on different distance from heavy metals pollution source – the ”Pechenganickel” company. Contamination factors and degrees of contamination […]
LIMNOLOGICAL FEATURES OF CIRQUE LAKES ON MOSKENESØY, LOFOTEN, NORTHERN NORWAY
Physical and chemical features of four cirque lakes situated in the Precambrian Basement north of the Arctic Circle are studied. Temperature, oxygen, water colour, turbidity and CODMn profiles together with transparency and lake colour indicate that the lakes are dimictic and oligotrophic. Deficiency of phosphorus are probably the main factor limiting primary production. The total […]
ACIDIFICATION TRENDS, LIMING STRATEGY AND EFFECTS OF LIMING FOR VIKEDALSELVA, A NORWEGIAN SALMON RIVER
The River Vikedalselva located on the southwestern part of Norway is monitored to detect acidification trends and liming effects as part of national monitoring programmes. The acidification of the river ha caused repeated fish kills of smolts and presmolts of Atlantic salmon (Salmon salar L.) and sea trout (Salmo trutta L.). The river showed significant […]
BERÄKNING AV KVÄVE- OCH FOSFORTRANSPORT MED HJÄLP AV SATELLITBILD OCH GIS Bornsjöns avrinningsområde / Calculation of Transports of Nitrogen and Phosphorus by Using Satellite Images and GIS Bornsjön Catchment Area
A literature study and a case study have been made to investigate the possibility to use GIS and remote sensing for calculating transportation of phosphorus and nitrogen in a catchment. To classify the land use a Spot image was used together with a map of urban areas. Other parameters such as land use, inclination, soil […]