Alla artiklar

Earlier investigations have shown that the run-off from a forested area increases after clear-cutting. For Swedish conditions, values between 90 and 406 mm/year have been reported. On the bases of micrometeorological measurements above clearcut and forest areas and of theoretical discussions, light can be shed on the causes to the run-off increase. The present micro-meteorological […]

Today there is a serious concern about the consequences of a global climate change. One possible effect of this change is a considerable rise of the sea level. According to several prognoses it may be expected that the sea level rise by the year 2100 may lie between 0.9 and 1.7 m with a preferred […]

The past decade’s chemical, toxicological and epidemiological research on by-products of drinking water chlorination has been reviewed. A large number of by-products has been identified and tested in different bioassays, and, recently, considerable progress has been made in the identification of Ames mutagenic byproducts. Still, there is little hope that the present uncertainty of chemical-toxicological […]

Raw water, treated water and distributed water from three water works in the vicinity of Oslo, Norway, were investigated for content of heterotrophic, aerobic microorganisms and total count of bacteria. The treatment was different in the three water works, but they all got raw water from the hypolimnion of stratified lakes. The total counts were […]

The mobile septage dewatering trucks are a new alternative to the more common practice for septage handling. The greatest advantage of the system is that the septage is treated at the point of production to the degree that it can be delivered directly to local farmers. Two systems are evaluated; Hamstern by the Mattsson Group […]

The relationship between total aluminium concentration and acidity was studied in water from 14 forest brooks. From the individual brook between 10 and 26 water samples were taken distributed over different parts of one to four consecutive years. All samples were taken during the period 1982-1986. For the whole material pH varied between 4.1 and […]

A sufficient coagulant dose is essential in order to obtain chemically treated humic surface water of satisfactory quality. But it is bad economy to apply too high a dosage just to be on the safe side. Studies at water treatment plants with large variations in the raw water humic content have shown that efficient supervision […]

As a result of new recommendations and guidelines prepared by the Swedish Environmental Protection board (SNV), the emphases of current and future monitoring programs have changed. However, little attention has been focused on nonpoint sources of water pollution in considering alternative designs. This is important because monitoring programs to detect the respective impacts from point […]

The first water pipe from Kallebäck completed in 1787 consisted of bored up timber of aspen and pine. It had served for 104 years when it in 1891 was replaced by a new cast iron pipe. Cast iron have since then been the dominating material of the pipes. Nowadays pipes with inside corrosion isolation of […]

A master plan for sewerage in Gothenburg has been developed. The Water and Sewage Works serves 30,000 inhabitants in a 140 km2 area. The sewers have a total length of 2,233 km. The first Gothenburg master plan for sewerage was adopted in 1866. Combined sewers were laid until 1957. Therafter separate storm sewers have been […]