1991-1

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]