Alla artiklar

The method developed by Karl Dunkers for collection, storage, and conservation of rainwater provides a means whereby drinking water can be economically produced in areas where traditional techniques are insufficient because of scarce water resources. This method has great potential for development and can be modified and adjusted in several ways for use in different […]

The octanol/water partition coefficient of three types of humic material was shown to increase with an increase in the hydrogen ion activity in the range of pH 6.5 to pH 3.5. These results suggest that a lowering of the pH of fresh waters may mobilize otherwise unavailable and potentially toxic humic compounds.

Infiltration plays a major role in calculations of runoff and of the amount of water available for percolation to the ground water. This paper presents and discusses two aspects of infiltration: measured infiltration capacity and infiltration derived from rainfall-runoff relations. The measured infiltration capacity, which can be said to correspond to the infiltration of ponded […]

Tunisia is a country which for its economical expansion is totally dependent upon its capability to develop and manage potential water resources. Irrigation requirements are competing with the demands caused by industrialization and a fast urbanization. Development of potential water resources is aggravated by the high temporal and spatial variability of rainfall and a frequent […]

Water currents through a blue-mussel culture have been studied together with inorganic nutrients, oxygen, salinity and temperature. A hanging long-line culture of Mytilus edulis L. was followed from June 1978 to March 1980. There were considerable changes in all parameters during the farming period. These changes were to some extent attributable to the seasonal cycle. […]

Mathematical models for sewer networks and for waste water treatment plants are combined to simulate six summer months of actual rainfall in the Oslo area. The sewer network is a combined sewer system. The simulations showed that a retention volume installed at the storm overflow could cause more pollution to escape from the treatment plant […]

The stream fauna is among other things dependent on the oxygen content of the water. So in recipient quality planning it is essential for the authorities to be able to investigate the effect of different loading situations on the water. The paper describes an investigation in the Langvad å drainage system in Zealand, Denmark, where […]

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 […]

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 […]

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 […]