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PhD defense by Kamilla Agnethe Smith Hansen

Kamilla Agnethe Smith Hansen, Department of Chemistry and Bioscience will defend her thesis on: "Removal of phosphate by Poly-P accumulating organisms in activated sludge and their fate in digesters"


31.01.2020 kl. 10.00 - 13.00



”Removal of phosphate by Poly-P accumulating organisms in activated sludge and their fate in digesters” 


Phosphorus (P) is a non-renewable resource and should be recovered when possible. One place to recover P could be from the digesters in wastewater treatment plants (WWTPs) which, depending on the size of the plant, receive large quantities of P each day. Polyphosphate accumulating organisms (PAOs) are organisms utilized in the enhanced biological phosphorus removal (EBPR) process in WWTPs and these microorganisms, storing P, are transferred from activated sludge and into digesters where P is released.

In this study it was investigated how the transfer from activated sludge into digesters would affect viability, substrate uptake and P release from known PAOs. A mass balance of the P pools found in the WWTPs was also conducted to get a better understanding of the P-pools available and an indication of how much of the P was stored in known PAOs. This was all done in an effort to better understand and optimize the recovery of P from WWTPs.


Professor Per Halkjær Nielsen, Dept. Chemistry and Bioscience, AAU, Denmark


  • Associate Professor Lars Haastrup (Chairman), Dept. of Chemistry and Bioscience, AAU, Denmark
  • Research Scientist Maite Pijuan, Fundació Institut Català de Recerca del´Aigua, Girona, Spain
  • Senior Scientist Henrik B. Møller, Department of Engineering, Aarhus University, Denmark 




Department of Chemistry and Bioscience, AAU, Section of Chemistry


Fredrik Bajers Vej 7H, 9220 Aalborg Ø, room number: Auditorium 1.102-6


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