1991-2

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 […]

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 […]

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 use of pond systems for wastewater treatment is reviewed, especially with respect to the use of chemical precipitation. A field study was conducted at the pond system of Funäsdalen where lime is added to the wastewater. The removal of organic matter (CODCr) and phosphorus was investigated during a range of well-controlled wastewater detention times. […]

In this paper the historical background to the process biological phosphorus removal is presented. The biochemical mechanism and future research work are discussed. Sammanfattning I föreliggande artikel presenteras den historiska bakgrunden till processen biologisk fosforavskiljning. Processens biokemiska mekanism och framtida FoU arbete diskuteras.

Experiments with three different phosphorus loadings have been conducted in pilot-scale. During an experimental period of 24 hour with normal loading the effluent concentration of PO4-P was stabile around 0.1 mg/1. The results show that even if the phosphorus loading is increased up to four times or if 60 % of a 24 h load […]

In november 1990 a new pilot plant for combined biological phosphorus- and nitrogen removal was started up at Sjölunda sewage treatment plant in Malmö. As a complement to the investigations in the pilot plant, laboratory tests were carried out in cooperation with Sjölunda during the autumn and winter 1990-91. The aims of this work were: […]

In november 1990 a new pilot plant for combined biological phosphorus and nitrogen removal was started up at Sjölunda sewage treatment plant in Malmö. So far (May 1991) the pilot plant studies have been focused on simultaneous phosphate uptake and denitrifikation. The results clearly show that it is possible to induce phosphate accumulating bacteria, under […]

Biological phosphorus and nitrogen removal has been implemented in full-scale at the wastewater treatment plant in Dalby. An investigation of the performance of the process has been conducted during the later half of 1990 and the beginning of 1991. The results from the investigation show that is possible to run a combined biological phosphorus and […]