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. […]
Författare
STEFAN JOHANSSON
Nyckelord (Keyword)
Lake Vänern, cyanobacteria, algal blooms, water quality, phosphorus load, nutriant removal, waste water, nitrogen reduction
Årgång
1997
Nummer
4
Utgåva
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 […]
Författare
THOMAS GUMBRICHT
Nyckelord (Keyword)
Landscape hydrology, modelling, geoinformatics, Cyprus
Årgång
1997
Nummer
4
Utgåva
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 […]
Författare
ÅSA EDELL and GREGORY M. MORRISON
Nyckelord (Keyword)
Pesticides, water quality directives, activated carbon.
Årgång
1997
Nummer
4
Utgåva
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 […]
Författare
MARIA TARKPEA
Nyckelord (Keyword)
sediments, risk assessment, bioavailability, metals, organic pollutants
Årgång
1997
Nummer
4
Utgåva
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 […]
Författare
KERSTIN ÅKERSTRAND
Nyckelord (Keyword)
water, micrfrungi, mould, actinomycetes, Phialophora
Årgång
1997
Nummer
4
Utgåva
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 […]
Författare
ILZE ALEREU AND JÖRGEN HANAEUS
Nyckelord (Keyword)
distribution network, drinking water, water quality, particles, particle composition, particle counter, turbidity.
Årgång
1997
Nummer
4
Utgåva
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: — […]
Författare
STEFAN MARKLUND
Nyckelord (Keyword)
drying beds, sludge drying, wastewater sludge, air drying
Årgång
1997
Nummer
4
Utgåva