Browsing by Author "Pöyry, Lauri"

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  • Aerobinen rakeinen liete eli AGS (Aerobic granular sludge) yhdyskuntajätevesien käsittelyssä
    (2017-04-28) Pöyry, Lauri
     Insinööritieteiden korkeakoulu | Bachelor's thesis
  • Modelling wastewater aeration system and high-speed turbo blower for energy efficiency improvements
    (2020-05-18) Pöyry, Lauri
     Insinööritieteiden korkeakoulu | Master's thesis
    In efforts to improve wastewater treatment plants’ energy efficiency, optimization of aeration process is often a point of interest due to its high energy intensity. Improvements in aeration blower technologies and process control strategies offer prospects for cutting down aeration energy consumption. Alternative to traditional blower technologies is the high-speed turbo blower, which along with improved energy efficiency offers many fringe benefits, which makes it a worthy candidate for blower replacement projects. With the high-speed technology, blower’s electrical complexity increases, creating some special considerations for the component manufacturers. This study attempts to characterize typical operation of a high-speed turbo blower in wastewater aeration process, in order to identify challenges and possibilities for energy efficiency improvements on equipment level. Study includes literature review on diffused aeration systems structure and control strategies, blower technologies and associated variable frequency drives and electric motors. A model of the diffused aeration system and high-speed turbo blowers of the Hermanninsaari wastewater treatment plant is developed for assessing the typical operating patterns and loadings of high-speed turbo blowers. Simulation results highlighted the challenges for energy efficiency optimization of highspeed turbo blower’s electrical equipment, whereas minimizing the backpressure through valve control optimization algorithms, could offer large savings for relatively small reductions in the backpressure. For systems operating larger blower groups, blower operating strategy has more possibilities for energy optimization.