Alla artiklar

It is invesdgated whether heat-treatment combined with pH-adjustmenr improves the dewatering characteristics of sewage sludge. The treatment is done in order to secure hygienisated sludge by which the manuring and earth-improving effect of the sludge can be utilized in agriculture without any precautions in the case of a fullscale sewage plant. Furthermore fihrate from the […]

The hypothesis tested in this work is that there is a significant direct uptake of phosphorus (from faeces from the culrivared fish and feed loss) from fish farms leading to increased growth ofwild fish. Direct uptake (DU) is defined as the phosphorus bound in wild fish. DU is associated with the growth ofall types ofwild […]

This work is based on data collected in the Liming-mercury-cesium project, and is, as far as the authors are aware, the most extensive set of dara collected to evaluate the eutrophication effecrs associated with fish farms in Swedish lakes. The hypothesis to test is whether fish farms raise lake phosphorus concentrations and thereby the production. […]

There is a great amount of chemicals in common use which are not adequately tested for their toxicity to aquatic animals. This is pardy due to the fact that tradiiional toxicity tests on animals are time consuming and expensive. Toxicity tests on higher animals are also erhically questionable and one can also quesdon the informative […]

A constructed wetland (30 ha) for reduction ofphosphorus and nitrogen has been creaced in connecrion to the effluent from the sewage treatment plant in the town of Hässleholm, Scania, southern Sweden. The supply of phosphorus to the wetland is calculated to be reduced by 50 %. The main phosphorus-redudng process will be uptake by macrophytes […]

Phytoplankton estimation and biomass determination are routine procedures in many lake monitoring i programmes, but there are often methodical difterences in the way the different investigators perform these analyses. We present here the results from a Danish inrercalibration on phytoplankton investigations in lakes. The aim was to assess the uncertainty in connection with phytoplankton investigations […]

Vattenburna sjukdomsutbrott förekommer i de nordiska länderna, ofta beroende på tillfälliga tekniska felakatigheter eller brist på skyddsåtgärder. Under perioden 1975-1991 inträfFade cirka 140 kända utbrott i allmänna ch enskilda system. För framtiden är en framförhållning viktig, både gällande rradirionella agens sami för nyuptäckta arter. Organismer som förekommer som del av vattnets normalflora kan här komma […]

The uncontrolled developmenr ihar has taken place in Thailand during the last decade has caused considerable damage to the environment and ro freshwater resources. The governance is suffering from a severe technological fix and has not fully internalised the imporcance of an adequate institutional framework for a sustainable magement of natural resources. There is also […]

The sludge treatment system at Oresundsverket in Helsingborg has been invesrigated primarily in order to assess the amounts of nitrogen and phosphorus that are recirculated within the wasrewater trearment plant. Through mass balances, it was possible to calculate the amount of recirculated phosphorus to jusi over 20 % elated to the inflow, and the amounr […]