PhD Defense by Susan Hove Hansen
Susan Hove Hansen, Department of Chemistry and Bioscience will defend her thesis on: "Metaproteomics in wastewater treatment systems - influence of exopolymers in membrane fouling and flocculation"
15.06.2018 kl. 10.00 - 13.00
"Metaproteomics in wastewater treatment systems - influence of exopolymers in membrane fouling and flocculation"
Membrane bioreactors (MBRs) have made their entry into the field of wastewater treatment due to the advantages of high effluent quality and low footprints. However, membrane fouling remains, despite several years’ research, the Achilles heel of this promising technology. Fouling is the build-up of unwanted biomass on the membrane that reduces flow, lowers treatment effectiveness, and eventually shortens membrane lifetime. In this PhD project, the problem of fouling has been investigated with focus on the role of activated sludge composition and in particular the proteinous extracellular polymeric compounds (EPSs) components and single microbial cells. The problem has been addressed by interdisciplinary approaches from the field of engineering with modelling and filtration tests in a laboratory scale MBR, combined with approaches from the field of microbial ecology and molecular biotechnology, especially the more sophisticated metaproteomics method, where the total protein content in a given sample is evaluated.
By combining interdisciplinary approaches, this PhD project provided useful insight into the fouling mechanisms in MBRs in wastewater treatment, emphasising the need to encounter the planktonic cells as key foulants of MBR sludge. Methodologies have been developed for applying metaproteomics on MBR biomass, which is the state-of-the-art molecular method for functional investigations of complex biological samples. Last, but not least, a novel function of the amyloidic EPS has been discovered, opening up new possible strategies for fouling control in MBRs.
- Professor Per Halkjær Nielsen
- Associate professor Lars Haastrup Pedersen, Department of Chemistry and Bioscience, AAU
- Professor Malte Hermansson University of Gothenburg Dept of Chemistry & Molecular Biology, Microbiology, Sweden
- Professor Bio- & Chemical Systems Technology, Reactor Engineering and Safety Chemical Engineering Dept, Belgium
AFTER THE DEFENSE A SMALL RECEPTION WILL BE HELD AT FREDRIK BAJERS VEJ 7H.
Department of Chemistry and Bioscience, AAU, Section of Biotechnology
Fredrik Bajers Vej 7H, 9220 Aalborg Ø, room number: Auditorium 1.002