Alla artiklar

The focus on environmental aspects in the society has increased the strive to find sustainable sysrems for drinking water production. This has lead to a greater inrerest in biological filtration, for example slow sand filtration (SSF). Biological pretreatment of raw water might reduce the need for chemicals in the following treatmem steps, with reduced sludge […]

The article gives a presentation of the Swedish environmental protecaon agency‘s project on Water management, a project concerning warer management and the implementation process of the EG Water framework directive on water policy. The overall aim of the project is to enhance the process ofimplementation, doing so by trying to find our difficulties concerning our […]

In a not too distant furure we will be working wiih Water management in Sweden, covering all river basin districts, with access to steering instrumenrs enabling us to achieve the decided objeaives. For decades people with specific interest in water management in Sweden have been trying to use water management in physical planning and environmental […]

A model system for advanced management of accidental toxic spill in drinking water sources is described. The system is based on the 1-D river model RIVTOX and 3-D lake model THREETOX. The model system was applied to the Lake Vomb catchment, which is located in the south of Sweden and from which approximately 400 000 […]

The relationships between water composition, formation factors and human impact were studied. Runoff was dependent on hydrological factors, but differing levels between eastern and western Larvia. Since knowledge of the seasonal dynamics of nutrient concentrations, and of the nutrient sources and sinks are especially important, the specific loads from different parts of Larvia were evaluaied. […]

The development and application of simulation models in water and environmenral planning and management have expanded greatly over the last decades. Such models are used in, for example, water quality assessments, and it is expected thai models will be applied for analyses and decision making to a greater and greater extent in the future. However, […]

In September 1997, the benthic habitat in Åsfjorden in Lake Vänern was studied at 23 stations by sediment profile imaging. Grab samples for qualitative analysis of the fauna was taken at nine stations. The sediment surface was oxidized at all stations and showed indication of biological activity by rubificids and chironomids in the entire Åsfprden. […]

Mesophilic and thermophilic digestion of primary and activated sludge was investigated in lab scale reactors. Mixed primary and activated sludge was digested in one experiment and activated sludge was digesred alone in another. The same gas yield, COD and dry solids reducrion was obtained with both mesophilic and thermophilic digestion. However, more dissolved COD was […]

Models and modeling require management of the inherent complexity. Simplicity in models and modeling is a positive characteristic. Models and modeling possess no intrinsic value. Their value may be assessed only relative to an objective or a problem to be solved.

Expansion for nitrogen reduction on Kalmar wastewater Treatment Plant (KARV) was realized with 2 sequencing batch reactors (SBR) for separate treatment of filtrate water. Online measuring instrumems were installed to make control of the SBR-process easier. The waterlevel and DO-meters are used for automatic operation control, whereas information on sludge content, pH, redox-pontential, ammonium and […]