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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. […]

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 […]

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 […]

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 […]

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 […]

To estimate the transport of different substances in streams and rivers, continuous series of runoff data are required. However, for most points where hydrochemistry is monitored, there are no adjacent discharge stations. As an alternative, the Swedish Meteorological and Hydrological Institute has since 1986 used the PULSE model, a conceptual runoff model, to produce the […]

The quality of drinking water must be monitored continuously. Before a raw water supply is taken into use its quality must be checked very carefully, and more detailed examinations must then be made at later stages, e.g. after five years. The larger examinations in effect form a continuous monitoring programme and can reveal some astonishing […]

Det danska dataprogrammet EFOR för simulering av de dynamiska processerna i en aktivslamanläggning tillgängligt i svensk översättning. I programmet efterliknas driften av ett reningsverk, och driftparametrar och driftresultat kan beräknas. Effekterna av ändrade drift- och belastningsförhållanden kan således förutses med programmets hjälp. Programmet är ett redskap, som kan användas för såväl driftoptimering som för analyser […]

Open low-loaded filter basins with drains is one example of biological methods for sewage treatment. Results from two new units, in operation since 1991, show a 95 %-reduction of total-P and BOD7 during the summer. The reduction is less during vintertime, due to lower biological activity in the filter. A study of this type of […]

The flow of water which leaks in through sewer manhole covers was estimated by experiments. During storms or periods of snow-melt, the volume of water leaking in through these manholes may increase the flow in the sewers substantially, resulting in an increased risk of secondary damage. The variations in water flow leaking through the key-holes […]