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Hydrological knowledge is scattered in many central, regional and local authorities and with consultants and researchers. In spite of a tendency towards an integrated view on hydrological issues the different expertise units will probably remain in power also in the year 2000. The separate hydrological topics probably benefit from this situation. Data on surface water, […]

Due to more complicated pollution situations future water management needs more reliable data on transport of pollutants from a variety of sources – both from external sources (air, land, waste water etc.) and from internal sources (e g regeneration from sediments). A common base for estimates of pollution inputs from these sources is different types […]

This paper aims at showing how a modern view of hydrology has developed in Sweden during the last thirty years. This is done by selecting some areas where Swedish research programmes have contributed to the development of the hydrological sciences, e.g. studies performed in so called representative basins, urban hydrological studies as well as research […]

Försök har utförts att avvattna och fosforfälla brunnsslam från Stockholms skärgård med hjälp av dels en Moos avvattningscontainer, dels en Reductor siltrumpress. För avvattningen har olika polyelektrolyter provats, och för fosforfällningen har järnklorid, aluminiumsulfat och Ekoflock använts. Undersökningen visar att fosforhalten kan sänkas från 50 mg/l till 1 a 2 mg/1, COD från 3 000 […]

Vid Mjölkulla reningsverk i Mjölby startades under perioden april-augusti 1985 ett försök med Alfax’ AIROXAL-process. Initiativtagare från Mjölby kommun var driftingenjör Börje Karlsson. Ett samarbete för försöket kom till stånd mellan Mjölby kommun, VIAK AB och Alfax AB. Försöket blev lyckat och som första kommun i Sverige kommer en permanent utrustning att installeras vid reningsverket […]

Possible reasons for the development of greater numbers of bacteria in paper-mill processes from the time around 1965 and onwards are discussed. The proportion of enterobacteria was relatively constant, a few per cent of the colony forming units (CFU) with Klebsiella, Enterobacter, and Erwinia dominating among members of Enterobacteriaceae. The concern for the possible effects […]

Muscle mercury accumulation in Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) have been studied in two small acidified coastal watersheds in S.W. Norway. Individual mercury concentration varied between 0.05 and 0.31 ppm (ìg/g) Hg, and increased significantly with age in all fish stocks, except one. Brown trout from Lake Djupvikvatn had the highest […]

A conceptual model for simultaneous computation of runoff and inorganic nitrogen leaching has been developed and tested. The model is semiempirical with coefficients that are calibrated against observed data. The model has been verified against data from two small fields of arable land in southern Sweden. The results indicate that a major part of variations […]

Based on experimental studies in a pH-stat the dissolution kinetics for K-slag, a tricalcium silicate, was determined. The expression is: [CHEMICAL FORMULA NOT INCLUDED] where the rate constants at 20°C are given by: pKi =5.36±0.18, pKW=8.15±0.08 and pKB= 7.3 ±0.06. The dissolution of K-slag is slower than calcite dissolution but faster than dolomite dissolution at […]

The concentrations of oxygen, nitrate, phosphate, particulate organic matter and planktonic algae around a cage fish farm during an annual cycle showed values similar to the concentrations in the water of the surrounding sea area. There was no increase of nutrients and no denser growth of algae in the cage fish farm. The concentration of […]