1988-2

The Gran procedure described by Molv©¡rsmyr and Lund (1983) was modified and automated for the routine analysis of strong and weak acids in freshwater. The titrations are carried out by coulometric generation of hydroxide ions in the pH range 3.6-10.3. The method measures the amount of non-volatile strong and weak acids in freshwater with a […]

Most Danish lakes and rivers are seriously eutrophicated and still greater areas of the coastal waters show oxygen depletion in the bottom layers during summer periods. Nitrogen washout from farmland and nitrogen, phosphorus and organic matter originating from domestic and industrial sewage, both contribute to increased phytoplankton and periphyton production and oxygen demands for decomposition. […]

Attempts to reduce the nitrogen content in wastewater at the sewage treatment plant Slottshagen in Norrköping have been accomplished during 1987. The plant, which takes care of the sewage from about 100,000 persons, was built for sedimentation, biological purification with activated sludge and chemical purification through post-precipitation in a separate step. After conversion of the […]

Studies of the permeable road construction, known as »the Unit Super Structure», have been carried out at the Department of Water-Resources Engineering, Lund Institute of Science and Technology/University of Lund, Sweden. The project consisted of three parts: – Hydrological studies – Technical and mechanical studies of materials – Production technical and economical studies The project […]

The analysis of AOX, adsorbable organic halogen, has been evaluated with an instrument which has not been in use in Sweden previously. The analysis was performed according to a German standard and analytical blank, and detection limit and reproducibility were studied. Typical AOX concentrations occurring in various wastewater and water samples are given.

The functional response of natural communities to different types of disturbance was measured in an in situ continuous flow apparatus. From continuous registrations of oxygen, light, temperature and water flow functional parameters like respiration and production were calculated. Some examples of functional responses of filter feeder and Fucus vesiculosus communities to cadmium and antifouling paint […]