BLÅGRÖNALGETOKSINER I DRIKKEVAND – INTRACELLUL/ERE LEVERTOKSINER FRIGIVES KUN DELVIST VED NEDFRYSNING AF VANDPRÖVER / Blue-green algal toxins in drinking water – only partial release of intracellular hepatotoxins through freezing of water samples
Quantification of toxins from blue-green algae (cyanobacteria), particularly the hepatoxic microcystins, has become a routine procedure in assessment of drinking-water quality in many countries. The effect of storing water samples frozen prior to toxin analysis was examined using a laboratory culture of Planktothrix agardhii. In culture material prepared (filtered and toxins in the culture medium […]
HÅLLBAR LÖSNING ELLER GRÖNT FILTER? Användning av mark-växtsystem för behandling av spillvatten i Sveriges kommuner / Sustainable solution or green end-of-pipe? The use of plant-soil-systems for treatment of sewage water in Swedish municipalities
There are an increasing interest for use of wetlands and irrigation solutions regarding treatment of sewage water in Sweden. The reasons behind this development, and practical consequences of the implementation of these solutions, provide us with characteristics of the changes. To be able to understand the possibilities for sustamable development in Sweden, such results are […]
FULLSKALE- OCH SIMULERINGSSTUDIE AV BIOLOGISK FOSFORREDUKTION PA KÄPPALAVERKET / Biological Phosphorus Removal at Käppala Wastewater Treatment Plant – a Full-scale and Simulation Study
Käppala wastewater treatment plant on Lidingö was extended for nitrogen removal. Due to the new process configuration the plant could implement biological phosphorus removal (bio-P). To study the possiobilities to introduce bio-P removal at the plant, fullscale and simulation tests were conducted. Results from the fullscale tests did not give any good answers since metal […]
NITROGEN CONVERSION PROCESSES WHEN TREATING WASTEWATER IN SOIL SYSTEMS – THE IMPORTANCE OF AMMONIUM ADSORPTION / Kväveomvandlingsprocesser vid behandling av avloppsvatten i ett markbehandlingssystem – Ammoniumadsorptionens betydelse
The objective of this study was to determine the importance of ammonium adsorption compared to other nitrogen separation and transformation processes, when infiltrating wastewater into vertical soil treatment systems. Mass balance calculations based on literature values were employed, but also complementary column experiments were performed to quantify the ammonium adsorption capacity of sand with respect […]
REMOVAL OF HUMIC SUBSTANCES DURING TREATMENT OF DRINKING WATER USING SORBENTS
The removal of humic substances during drinking water preparation by artificial recharge of groundwaters using synthetic sorbents, activated carbon and anthracite was assessed. Humic (HA) and fulvic (FA) acids isolated from soil, peat, water, filters, from the infiltration basin for artificial groundwater recharge, as well as commercial humic acid, were used in study. It was […]
WATER QUALITY CHANGES IN LATVIA IN RELATION TO CHANGING LOADING LEVELS
Long-term changes of the chemical composition and biological quality of Lacvian inland waters have been evaluated. Water composition, the major factors influendng water chemistry, and the human impacts were studied to determine the changes after recent reductions ofpollution emissions, particularly nurrient loading, to surface waters. The chemical composition much depends on hydrological factors, which differs […]
AVFALLSDEPONERING OCH HÅLLBAR UTVECKLING / Landfilling and sustainable development
Collection and treatment of the gas and leachate during the active period of a landfill is proposed in the EC landfill direcrives and in the proposal for new landfill directives in Sweden in order to reduce the risk for methane gas emissions and contamination of water resources. The directives propose an increased pretreatment of the […]
VÄRDET AV NY TEKNIK FÖR KVÄVERENING OCH RECIPIENTENS SJÄLVRENING:En tillämpning på Himmerfjärden / The value of alternative technologies for nutrient abatement in Himmerfjärden; new technology for sewage treatment plants and coastal zones as pollutant sinks
The economic value of two alternative ways of nitrogen abatement are calculated: recent development of cleaning capacities at sewage treatment plants and ihe use of coasral zones nitrogen sink capacity. The values calculated as cost savings obtained from the alternative technologies. The analysis reveals that the value of technologies increase for higher levels ofnutrienr reducrions […]
IMPROVEMENT OF SANITARY SOLUTIONS FOR SMALL WASTEWATER TREATMENT SYSTEMS
The Swedish Delegation for Sustainable Technology and Stockholm Water Co. have initiated a competition for the design and construction of small wastewater treatment units. Improvements in environmental impact and potential for nutrients recycling are expected, compared with conventional technology used today, i.e. settling and infiltrarion or filtration beds. Such differenr types of treatment systems are […]
APPLICATION OF THE HBV-N MODEL TO THE BALTIC SEA DRAINAGE BASIN
A hydrochemical model, HBV-N, was set up in a first simple applicarion to simulate the river-borne transport of nitrogen to the Baltic Sea and its main basins. The land area of 1729 000 km2 was divided into 25 subbasins. The input data were coarse and the model was calibrated against long term monthly mean concentradons […]