The input of petroleum hydrocarbons (PHC) to the coastal waters in the province of Stockholm has been theoretically estimated to 150-630 tons/year. The main quantity originates from land-based discharges. These are transported to the coastal waters directly from municipal waste water treatment plants (20-60 tons/year) and industries (40-145 tons /year) and indirectly from atmospheric fallout […]
On the Swedish west coast an increased demand for new small boat harbours has often lead to conflicts with the coastal fishery and nature conservationists. In this study the effects of small boat harbours on the mobile epibenthic fauna (shrimps, crabs and small fishes) and infauna (mussels, worms and small crustaceans) were investigated. Quantitative samples […]
The dissolution efficiency for different stream liming methods can be shown to depend upon a small number of parameters. They are several orders of magnitude more important than other parameters influencing the dissolution efficiency. The parameters are: – Particle size distribution – Initial pH-value– Dose intensity– Degree of wet slurrying The particle size distribution and […]
Författare HARALD U. SVERDRUP, PER G. WARFVINGE, and JAMES FRASER
A hydrological model for runoff simulation in basins dominated by forests and lakes has been developed and tested. The results suggest that the dynamics in the runoff record may be reproduced without extensive model calibration provided the damping in the lakes is described explicitly and a division into submodels is made. The volume errors may […]
Författare STEN BERGSTRÖM, MAJA BRANDT and BENGT CARLSSON
Most Danish streams have their discharge reduced due to withdrawal of water for field irrigational purposes. Reduced discharge creates a deteriorated stream environment, that is reduced depth, reduced water velocity, increased sedimentation of oxygen consuming organic substances, reduced reaeration of oxygen, and larger temperature excursions. These factors combined with an improved light regime at the […]
The evaluation of the possible transmission routes of viral diseases in public swimming pools and their environments demands extension of the hygienic control not only to the swimming water but to the total environments of these facilities. The same clinical syndrome may be caused by several types of viruses and one type of virus may […]
The demands on the Swedish wastewater treatment plants have increased dramatically during the last decades. As a consequence more complicated processes are used today. Also, in order to reduce the capital costs there has been a tendency to use as small process volumes as possible, i.e. the volumetric loads used have increased. Therefore, the treatment […]
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