1985-2

A monitoring system is described which provides continuous measurements of selected pollutants in stormwater. The system, which has been installed at both the outfall to a storm-water pipe system and in a gullypot, is sensitive to changes in pH, conductivity, dissolved oxygen concentration, temperature and redox potential. At the stormwater outfall monitoring station rapid changes […]

Bromma municipal wastewater treatment plant is the second largest plant in Stockholm with a design flow of 160,000 m3/day. Decisions were made in 1982 to study nitrification of side- streams from the dewatering of digested sludge in full-scale at Bromma in order to improve the overall nitrification capacity of the plant. The investigation is jointly […]

Mutagenic activity in Salmonella typhimurium strains TA100 and TA98 was determined for chlorinated drinking water, purified from raw water with a high content of humic material, and for a natural humic water treated with chlorine. A remarkably high activity was found for XAD-4/8 concentrates of acid water samples compared to neutral samples in tests performed […]

A recently developed system for recirculation of aquaculture waste water was examinined. It is based upon the use of settling, a mixture of 3 ion exchangers, and sand filtration. The results were satisfactory, giving an acceptable water quality over a period of 7 months with complete recirculation. The ion exchange unit is also operating as […]

Storm overflows contribute considerably to pollution. However, the pollution authorities and municipalities often fail to take appropriate measures to correct the situation. Investigations in Norway have shown that the storm overflow constructions and maintenance usually are not satisfactory. On the other hand, research projects have shown that storm overflow types, like the swirl concentrator, perform […]