Alla artiklar

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 […]

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 […]

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 […]

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 […]

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 […]

VBB VIAK has developed a useful planning tool for stormwater management. It is presented in a GIS format with links to spreadsheet models in Excel and/or databases in Access. RunofFwater flows and pollutant loads are calculated in the watershed management model Stormtac. Data from Stormtac, together wkh exisung measurements and sampling data, are exported into […]

Bivalves were used as environmental biomonitors by studying the growth rate and the structure of their shells, as well as by analysing elemental distribution in the shells. Information about water chemistry, temperature and pH, precipitarion, food supply and other environmental paramerers are stored in the bivalve shells. To be able to disclose the environmenral archives […]

During the past century human activides have at least doubled the rate ofnitrogen fixation in the global landbased nitrogen cycle. Besides being beneficial to human societal development, this has many deleterious consequences for the environment. As part ofthe responses to the call for world-wide acrion on the problems with nitrogen, this paper focuses on the […]

The activities at the Department of Water Resources Engineering (previously the Department of Hydraulics) from 1966-1988 was characterized by a socially a ware attitude to water issues. There were obvious reasons for such an approach. The department launched its activties in the midst of global concerns for the lack of adequate water resources to meet […]

Historically people and institutional actors have always joined together to manage water problems in a situation of water scarcity. Examples of river basin administrations in China, Germany, England and Wales and France are given in this paper. It is noted that the French water management system has become the model for the EU Commission Proposal […]