1988-4

In Hörnefors, a village at the east coast of northern Sweden, a new ground water well almost free from detectable bacteria was connected to the old water distribution system, and chlorination was withdrawn. Within four months bacteriological controls indicated the presence of bacterial counts exceeding official limits in drinking water, and an epidemiological survey showed […]

Eutrophication is one of the serious pollution problems in the Baltic Sea Area. The nutrients originate from different sources. Agriculture is one of the important sources. In 1985 The Helsinki Commission decided to establish an agriculture working group. The aim of the group was to draft recommendations on reduction in agricultural pollution. The working group […]

A conceptual model for simultaneous computation of runoff and inorganic leaching from forests, arable lands and lakes has been developed and tested. The model has been verified against data from the Ekenäs area in the county of Södermanland in SE Sweden. The aim is to develop a model which includes the most important factors controlling […]

The addition of plant nutrients to the sea is today one of the most important environmental problems. It is of the outmost importance that measures taken against such discharges will be as cost effective as possible. A computer based mathematical model is described to calculate the transport of phosphorus to the recipient. The drainage area […]

A fullscale plant applicating the Karl Dunkers’ system for combined treatment of separate storm water and lake water is since 1981 operating in the northern part of the lake Rönningesjön, close to Stockholm. The treatment is executed in three simultaneous steps: 1) flow balancing in tanks floating in the lake, 2) phosphorus removal using Fe […]

Swedish environmental policies have aimed at connecting even small point source discharges to tertiary treatment plants, either by large scale collection and treatment systems or by small separate plants. The cost-effectiveness of the strategy for a number of urban areas with less than 1,000 inhabitants was evaluated in one municipality (115,000 inhabitants) in the south […]