1995-1

Mysterious epidemics among drinking water consumers have been related to mass developments ofporentially toxic blue-green algae (Cyanobacteria) in drinking water reservoirs. Blue-green algae can pass rapid sandfiltraion and activated carbon filtrarion. The blue-green algal toxin microcystin has been detected in drinking water after treatment with rapid sand filtrarion/chlorination; rapid sand filtradon/flocculation and after activated carbon […]

There are rwo basic lake types, holomictic and meromictic. Holomictic lakes have a complete verrical mixing whereas the circulation ofmeromictic lakes is incomplete. Meromictic condiaons may be due to accumulation of e.g. iron compounds m the deep water or intrusion ofsalt water into fi-eshwater lakes. Meromicuc conditions may also occur in deep coastal inlets which […]

During the coming years, Sweden is planning to supporr the construction of several modern wastewarer treatment planrs in ihe Baltic States (e.g. Estonia), in order to improve the vast eutrophication ofthe coastal areas and the open Baluc Sea. Minor attendon is taken to the environmental impact of the future wasrewater treatment plant. Although, the lack […]

The summer of 1994 was unusually hoi in Sweden and this caused high temperatures for the raw water and drinking water in Gothenburg. The temperature exceeded 20°C during several weeks. It is well known that temperature has a strong influence on the microbiological activity, but neither the bacterial counts nor the number of taste and […]

A large numbder of samples of the influent, efHuent and the sludge at the Rya WWTP in Göteborg wasanalyzed for organic Priority Pollutants berween 1984 and 1994. Many Priority Pollutants are not used in Göteborg or used in very small quandties and therefore have not been detected in any of the samples or detected sporadically. […]

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 […]

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 […]

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 […]