1994-3

The Gulf of Bothnia makes about 29 % of the whole water volume of the Baltic Sea. The water exchange between the Baltic Proper and the Gulf is good, which results in a water renewal time of only about 4 to 5 years. This is one of the reasons why there is no lack of […]

The reason(s) to the marked ecological differences berween the Bothnian Bay and Bothnian Sea, and the potential coupling to their different biogeochemistry, is unclear. Lack of simultaneous estimates of ecological parameters with sufficient spatiotemporal sampling frequency in the off-shore environment hampers the understanding of the marine food web in the Gulf of Bothnia. To improve […]

Based on the intensive hydrochemical measurements during the Gulf of Bochnia Year 1991, we present descriptions of the regional variations of freshwater and nutrient inputs and hydrographic and nutrient conditions in the basins for this particular year. These data are then used to construct budgets of silicate, inorganic and organic nitrogen and phosphorus for the […]

The largest point emissions of heavy metals and persistent organic substances in the land area surrounding the Gulf of Bothnia have now been virtually eliminated. Despite this, the environment in this region is not approaching a preindustrial state.Like other regions, the Gulf of Bothnia region is affected by long-range atmospheric transport of persistent organic substances. […]

Tree roots entering sewer pipes is an expensive problem which can lead to serious conflicts of interest beween arborist and sewer companies. A substantial amount of money is spent each year on different meaures to remove the roots after they have grown into pipes. The most frequently used methods to prevent root penetration are designed […]

This paper presents some of the results of a statistical smdy on reported bursts of water pipes in five swedish cities. The study is a part of a continuing project called PUFF, with the objective to develop guidelines for long-term maintenance and renewal of water and sewer pipe systems. The work was carried out by […]

Ever since the reconstruction of Öresundsverket in Helsingborg was finished in the beginning of 1992 an extensive and regular sampling from the inflow has been carried out. This work has increased the understanding of what variations affecting the outcome of the waste water treatment. The aim of this article is to how how the characterization […]

The goal of this investigation was to determine a value for the fraction of unbiodegradable particulate oganic material in the influent wastewater at the Sjölunda WWTP. The method selected for this purpose was to operate rwo identical laboratory scale units as aerobic fill and draw activated sludge sysrems. This in order to generate data that […]