ENERGIEFFEKTIVISERING AV LUFTNINGSSTEGET PÅ KÄPPALAVERKET, LIDINGÖ / Energy optimization of the aeration at Käppala wastewater treatment plant, Stockholm
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 compared. The first two strategies that were tested: i) individual oxygen control and ii) ammonia- and oxygen- feedback control, gave a reduction of the total airflow of 16 % and 9 % respectively. Thereafter the two strategies were combined to: iii) individual oxygen control with ammonia- and oxygen- feedback. The third strategy gave the best results with a reduction in the airflow consumption of 18 % and with a preserved degree of nutrient removal.