In conventional wastewater treatment plants the aeration of the biological treatment process is often one of the largest energy consumers. As a part of making Käppala WWTP more energy efficient three full-scale optimization experiments of the biological treatment process have been performed. In this article, the different strategies are described and evaluated and the results […]
Författare
ANDREAS THUNBERG, ANNA MARIA SUNDIN och BENGT CARLSSON
Nyckelord (Keyword)
aeration, individual oxygen control, ammonia-feedback, oxygen-feedback, KLa-function
Årgång
2007
Nummer
2
Utgåva
Increasing discharge demands put higher pressure on process optimisation and control of the wastewater treatment plant performance. For evaluation and regulation of the process performance, oxygen uptake rate (OUR) measurement is a useful tool. In this paper one way to perform oxygen uptake rate measurements is described. Possible applications of the method for wastewater treatment […]
Författare
Marinette Hagman and Jes la Cour Jansen
Nyckelord (Keyword)
aerobic degradation, activated sludge, organic degradation, oxygen uptake rate, respirometry,
wastewater
Årgång
2007
Nummer
2
Utgåva
The microbial transformation of ammonia to nitrate, the nitrification, is a central process in the nitrogen biogeochemical cycle. In a modern wastewater treatment plant, the nitrification process is a key process in the removal of nitrogen and inhibitory compounds in sewage can seriously affect the nitrogen removal. A major sewage cleaning plant in the southern […]
Författare
Jens Peter Thomsen and Steffen Girke Jørgensen
Nyckelord (Keyword)
Inhibition, nitrification, scrubber water, wastewater treatment
Årgång
2007
Nummer
2
Utgåva
Common reed is found in near-shore areas of many European lakes, where it frequently forms dense stands. In order to evaluate the effects of common reed stands on waves and to test a model for wave attenuation caused by vegetation, a field experiment was conducted in the common reed stands of a southern Swedish lake. […]
Författare
PER FALÅS och CHARLOTTA BORELL LÖVSTEDT
Nyckelord (Keyword)
waves, Phragmites australis, wave attenuation model, erosion, sediment stabilization
Årgång
2007
Nummer
2
Utgåva
It is today possible to have an extra pipe installed in an existing sewer with traditional cured in place (CIPP) technology. Such an installation will affect the capacity of the sewer. The cross sectional area will decrease and the hydraulic radius will increase which decreases the capacity. The new liner will have a smother surface, […]
Författare
Jonas German
Nyckelord (Keyword)
2in1 pipe, sewer, CFD, hydraulic capacity, non-circular section, Colebrook-White, Nikuradse
Årgång
2007
Nummer
2
Utgåva
In January 2007, all municipal water wells of Simrishamn, south Sweden, were sampled and analyzed for the presence of pesticide residuals. In total 34 wells were analyzed. The samples were analyzed at an accredited laboratory with respect to 77 different parameters of pesticides which either are used or have been used in the recharge area […]
Författare
Bengt-Olov lindqvist, Jan-Bertil Hansson, Christina Jönsson och Kenneth M Persson
Nyckelord (Keyword)
pesticides, groundwater, Simrishamn, long-term changes
Årgång
2007
Nummer
2
Utgåva