Bent Jütte’s research while affiliated with Aalborg University and other places

A research and monitoring station has been established as a part of the intercepting sewer from Frejlev, a small town of 2000 inhabitants 7 km Southwest of Aalborg, Denmark. The purpose is to perform continuous high quality time series of flow as well as waste water and runoff water characteristics. Based on these future time series, research will be carried out in order to establish knowledge on dry weather characteristics, and rainfall-runoff relationships including the variability of relevant storm water pollutants. Furthermore, the measurements can form the basis of a better understanding of transport and transformation of pollutants in combined sewers including suspended and bed load characteristics, sedimentation and resuspension.

A research and monitoring station has been established as a part of the intercepting sewer from Frejlev, a small town of 2000 inhabitants 7 km Southwest of Aalborg, Denmark. The purpose is to perform continuous high quality time series of flow as well as waste water and runoff water characteristics. Based on these future time series, research will be carried out in order to establish knowledge on dry weather characteristics, and rainfall-runoff relationships including the variability of relevant storm water pollutants. Furthermore, the measurements can form the basis of a better understanding of transport and transformation of pollutants in combined sewers including suspended and bed load characteristics, sedimentation and resuspension.

Increased concern for the impact of hydrogen sulphide produced under anaerobic conditions in wastewater has lead to the need for pretreatment of the sewage. Intensive field investigations on hydrogen sulphide formation, impacts and control in sewerage systems were carried out during the period 1985–1987. Emphasis was given to determining the importance of sulphate, organic matter, temperature and anaerobic residence time on sulphide formation in a 3.9 km pressure main. Based on these studies an empirical model for the sulphide buildup in sewers was proposed and evaluated. Variation of the diurnal sewerage composition and flow and the importance of the type of sewage (municipal/industrial) on sulphide formation was also taken into account. Furthermore, full scale experiments in which iron sulphate was added to the sewage were carried out under fluctuating conditions in order to optimize precipitation of the sulphide produced and reduce the impact of the hydrogen sulphide. A system for control and adjustment of the chemicals dosed was developed based on the proposed model and an evaluation of the importance of the external parameters and conditions.