NY VÅTMARKSANLÄGGNING FÖR KOMBINERAD REDUKTION AV FOSFOR OCH KVÄVE / A new constructed wetland for combined reduction of phosphorus and nitrogen
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 […]
INTERCALIBRATION OF PHYTOPLANKTON INVESTIGATIONS
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 SJUKDOMAR – RETROSPEKTIVT OCH I FRAMTIDEN / Waterborne Diseases – Retrospectively and for the Future
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 […]
THAILANDS UTVECKLING – ETT HOT MOT VATTEN OCH MILJÖ / The Development Process in Thailand – A Threat to Water and the Environment
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 […]
ÖRESUNDSVERKET – SLAMBEHANDLING / Öresundsverket – Sludge Treatment
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 […]
ORGANISKA FÖRORENINGAR I KOMMUNALT AVLOPPSVATTEN OCH DERAS BET/DELSE FÖR VATTENKVALITETEN / Organic Pollutants in Municipal Wastewater and their Significance for the Wastewater Quality
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. […]
BRA YTVATTEN KAN GE BRA DRICKSVATTEN TROTS HÖG TEMPERATUR Driftsuppföljning av den varma sommarens påverkan på dricksvattenkvaliteten i Göteborg 1994 / High Quality Surface Water can be used for High Quality Drinking Water in Spite of High Temperature
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 […]
HAAPSALUMODELLEN – EN VISION OM EFFEKTIVARE VATTENRENING PÅ LOKAL OCH REGIONAL NIVÅ / The Haapsalu Model – a Vision of More Efficient Wastewater Treatment on the Local and Regional Level
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 […]
MEROMIKTISKA SJÖAR – SÄREGNA OCH SKYDDSVÄRDA / Meromictic Lakes
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 […]