ÖVERGÖDNINGENS OCH METALLUTSLÄPPENS PÅVERKAN PÅ MAKROALGERNA GRÖNSLICK [CLADOPHORA GLOMERATA) OCH ULLSLEKE [CERAMIUM TENUICORNE) / The influence of eutrophication and metal contamination on the seaweeds Cladophora glomerata and Ceranium tenuicorne
The changes in the state of equilibrium between the two common Baltic sea-algae Cladophora glomerata and Ceramium tenuicorne as a result ofeutrofication and the discharge of metals has been studied. The results show that C. glomerata is more capable than C. tenuicorne to utilize an enhanced content of nutritive substances for growth. C. glomerata shows […]
A STUDY OF THE INFLUENCE OF CRACKING ON WASTEWATER SLUDGE DRYING BEHAVIOUR / Sprickbildningens inverkan på slamtorkningsförloppet
Aerobically digested mixed biological and aluminium precipitated sludge with an initial total solids content of ca 5 % was tested on 5 pilot sand drying beds indoors. The test run continued for 84 days in a controlled environment, with a relative humidity of 30—40 % and a temperature of 24-27°C. The results showed that: — […]
PARTICLE DYNAMICS IN THE DRINKING WATER DISTRIBUTION NETWORK OF LULEÅ / Partikeldynamik i Luleas dricksvattennät
An investigation of the particle quantity and size distribution, along with the turbidity pattern, has been used to study particle behaviour within the municipal water distribution system of the city of Luleå, Sweden (65 000 consumers). The water source is the Lule River, which has a soft water with a hardness of 20-30 mg/L as […]
MIKROSVAMP OCH AKTINOMYCETER I DRICKSVATTEN / Microfungi and actinomycetes in drinking water
During the last two decades analyses of microfungi (yeasts and moulds) and actinomycetes have been conducted on drinking water in Sweden. From originally being a pilot study conducted to obtain knowledge of the extent to which these microorganisms can be detected in untreated water and in the distribution network, today the analyses are conducted both […]
FÖRSLAG TILL EKOTOXIKOLOGISK RISKBEDÖMNING AV SEDIMENT – INTEGRERAD KEMISK OCH BIOLOGISK KARAKTERISERING / Proposal for an ecotoxicological risk assessment of sediments – An integrated chemical and biological characterisation
A strategy for the sampling, analysis and biological assessment of sediments contaminated from a variety of sources in urban areas, such as industry and surface run off is suggested for Swedish conditions. The strategy is suitable for an initial assessment of chemical content, bio-availability, genotoxicity and the persistence of known persistent pollutants. The strategy includes […]
CRITICAL EVALUATION OF PESTICIDES IN THE AQUATIC ENVIRONMENT AND THEIR REMOVAL FROM DRINKING WATER
The presence of pesticides in the aquatic environment represents a potential threat to water quality and human health. Relatively soluble herbicides, such as the chlorphenoxy acids and triazines, applied in agriculture can reach drinking water sources. These herbicides show marked seasonal variations in concentration and have a longer residence time in groundwater and surface water […]
VÄXELVERKAN MELLAN VEGETATION OCH VATTNETS KRETSLOPP / Vegetation and water cycle interaction
The paper suggests a reciprocity between the landscape and the water cycle. Different processor properties of the water cycle dominate in different landscapes, mainly dependent on the vegetation cover and degree of ecological development. Satellite images and geographic information systems are used for recognising pattern similarities between the water cycle and the landscape. A new […]
KRAFTIGA BLOMNINGAR AV CYANOBAKTERIER OCH SAMBAND MED NÄRINGSÄMNEN I NÅGRA AV VÄNERNS GRUNDA VIKAR / Heavy blooms of cyanobacteria in Lake Vänern
Lake Vänern is an oligotrophic lake today, but in the northeast part of the lake there are three shallow bays (Ölmeviken, Varnumsviken and Kolstrandsviken) where some heavy blooms with cyanobacteria, occurred during the last ten years. In this article, the blooms and relations to the water quality and the phosphorous loads are reported and discussed. […]
AERATION BY DESTRATIFICATION: A TECHNIQUE FOR RESTORING THE WATER QUALITY OF LAKES AND RESERVOIRS
Lake and reservoir eutrophication is a complex process involving a variety of factors which are difficult to act upon simultaneously. The process is triggered off and perpetuated by nutriment inputs from the drainage basin. These may come into play at a later stage however, when the water body stratifies thermally in the summer, cau-sing phosphorus […]
n-OCTANOL/WATER PARTITION OF AQUATIC HUMUS USING SEGMENTED FLOW EXTRACTION / Mätningar av fördelningen av akvatisk humus mellan vatten och n-oktanol i vätske/vätske segmenterat flöde
Segmented flow extraction has been applied to studies of the n-octanol/water partition of aquatic humus. This material is a heterogeneous mixture of compounds many of which have surfactant properties complicating the studies. The segmented flow extraction method is proved to be a simple and useful tool for screening the lipophilicity of humus thereby aiding in […]