System Aqua has been designed to meet the growing need for an objective, reproducible and comprehensive tool for assessing the conservation value of Swedish lakes and watercourses as well as for identifying waterbodies worth rehabilitation. The system may be used to provide an integrated assessment of whole catchments together with their component waters. Emphasis in […]
Författare
EVA WILLENoch BERTA ANDERSSON
Nyckelord (Keyword)
nature conservation, biodiversity, assessment tool, lakes, watercourses, catchments.
Årgång
1998
Nummer
2
Utgåva
Trace metal concentrations in brackish and sea water can be determined by ICP-SMS (inductively coupled plasma sector mass spectrometry) with no pretreatment other than acidification and dilution. This is possible because of i) very low instrumental detection limits, and ii) the elimination of most of the spectral interferences caused by the salts. These interferences make […]
Författare
THOMAS RUTH
Nyckelord (Keyword)
ICP-SMS, high-resolution ICP-MS, trace element determination, sea water, brackish water
Årgång
1998
Nummer
2
Utgåva
One strategy to increase the amount of nutrients recycled is to handle urine separately and use it as a fertiliser. However, an extended use of urine separation toilets will result in considerable volumes to be handled. The amount of urine solution could be reduced by using drying techniques. However, the possibilities of dewatering urine by […]
Författare
DANIEL HELLSTRÖM and JOHANNA THURDIN
Nyckelord (Keyword)
urine, drying, acid, nitrogen, ammonia, urea
Årgång
1998
Nummer
2
Utgåva
By using an alternative road construction with permeable asphalt over an open-graded aggregate base the stormwater is infiltrated into the ground. No regular stormwater pipes and manholes are needed A full scale study of an alternative road construction in a cold climate is presented in this article. Two roads in a housing area in Luleå, […]
Författare
MAGNUS BÄCKSTRÖM and CARIN FORSBERG
Nyckelord (Keyword)
stormwater, runoff, permeable asphalt, cold climate, snowmelt, alternative road construction.
Årgång
1998
Nummer
2
Utgåva
Snow melt and snow handling are of great concern for the municipalities in cold regions. Urban run off is influenced by the piling of snow. In order to design deposit areas, storm water systems, etc. forecasts of urban snow melt run off should consider melting of snow piles. Piling of snow delays the melt and […]
Författare
EVA SUNDIN
Nyckelord (Keyword)
urban hydrology, urban snow deposit, snow melt, degree day method.
Årgång
1998
Nummer
2
Utgåva
The work with water resources has changed during the last two-three decades. We have solved the problems with point sources. Now we have to concentrate on the diffuse sources, within a sector integrated planning EU is working on a Framework Directive for water, with demands of river basin management. The use of water resources depends […]
Författare
HENRIK LINDSTRÖM
Nyckelord (Keyword)
river basin management, sector integration, physical planning
Årgång
1998
Nummer
2
Utgåva
The Municipality of Skelleftea is responsible for the operation of several small wastewater treatment plants with insufficient removal of organic matter and nutrients. The small wastewater treatment plants normally consist of septic tanks. A common solution to improve the removal efficiency of small plants is to build infiltration beds. However, due to local conditions this […]
Författare
DANIEL HELLSTRÖM, BERNT JOHANSSON och KENNETH NILSSON
Nyckelord (Keyword)
septic tanks, small treatment plants, biological treatment, trickling filter, SBR
Årgång
1998
Nummer
2
Utgåva