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In the county of Göteborg and Bohus 90 % of the 740,000 inhabitants are dependent on municipal water, mainly from surface water resources. However, the number of groundwater wells exceeds that of surface water supplies, supporting the most densely populated areas. In spite of high vulnerability to pollution and lack of alternative water in case […]

The aeration zone forms in the course of the infiltration intake operation as a result of basin floor clogging due to silt build-up. This zone was found to have a noticeable contribution to the hydraulics of the infiltration water intake. The aeration zone effect was investigated on a modified infiltration water intake model. The model […]

A study has been made of two digestion procedures for the conversion of organically bound phosphorus to orthophosphate. The aim of the study was to establish if the procedures are applicable to pulp and paper mill effluents. The procedures selected were the standardized peroxodisulphate method and a method using strong acid for the digestion. The […]

Direct and indirect impacts on existing wetlands potentially threaten this resource. There is a need for more information about the nature and extent of wetland resources and potential impacts of human activities on wetland systems. This information can then be incorporated into integrated water- and land-use planning efforts at the municipal level. This paper presents […]

Methods for biological nitrogen and phosphorus removal in domestic wastewater have been developed to a great extent during the last two decades. Thus, it is desirable to design a sewage treatment plant in a flexible way in order to change the mode of operation particularly in an area with rapid population growth. Sunbury Sewage Treatment […]

Measurements of bacterial growth potential were carried out in the drinking water treatment plant and distribution net of the city Norrköping, Sweden. The growth of bacterial biomass was measured with two specific bacterial strains, Pseudomonas fluorescens strain P17 and Aeromonas hydrophila M 800, and with the indigenous bacterial population found in the raw water of […]

Denitrification tests with a DynaSand filter have been performed at the Klagshamn sewage treatment plant in Malmö. Effluent wastewater from a nitrifying activated sludge plant was treated in a filter with a surface area of 0.7 m2 and a sand bed depth of 2 m. The grain size of the sand was between 2 and […]

Loads of phosphorus, nitrogen and CODMn have been estimated on an annual basis from two nearby watersheds in central Sweden. The computations were performed according to the following five techniques: 1.Momentary analysis of concentration together with discharge measurements in the middle of a bimonthly period. 2. Momentary analysis of concentration as above but with measurements […]

Most methods for determination of lignin derivatives in effluents and recipient waters are based on photometric measurements directly or after colour reactions with the phenolic hydroxyl groups. These methods are critically discussed. In applying the methods it is assumed that the character of lignin derivatives is aromatic. This is the case for lignin derivatives of […]

The accumulation and distribution of PAH and PCB in different size fractions of contaminated sediments from The Norwegian Fjord Sandefjord and the bioaccumulation of these contaminants in sediment reworkers have been studied using dredged sediments.The sediment reworker Corophium volutator (a sediment reworker included in OSPAR’s toxicity test battery for chemicals used and discharged offshore in […]