Abgeschlossene Arbeiten seit 2004
Nutzen Sie die Recherchemöglichkieten im Forschungsinformationssystem (FIS) zur weiteren Einschränkung der aufgelisteten Abschlussarbeiten.
Assess the impact of aeration to limit membrane fouling in a membrane bioreactor under special consideration of extracellular polymeric substances (proteins and cabohydrates) in the mixed liquor
Art der Abschlussarbeit
Master
Autoren
- Krüger, Malte Sean
Betreuer
- Prof. Dr. sc. techn. Peter Krebs
- Dr.-Ing. Jens Tränckner
- Dr.-Ing. Volker Kühn
Weitere Betreuer
Dr. Claire Albasi (CNRS, Toulouse), Etienne Braak (CNRS, Toulouse)
Abstract
"With the consequences of a rising world population and their improvement of living standards coupled with a climate change, the protection of world’s water resources are of prime importance for achieving sustainable development in the 21th century.
Membrane bioreactors (MBR) have become an accepted alternative wastewater treatment to the conventional activated sludge process for both municipal and industrial applications. The main advantage of producing a constant and high quality product water independent of the feed water is facing the serious drawback of elevated energy expenditures mainly caused by membrane fouling. Various improvements and measures were already undertaken to
counteract this phenomenon. The application of a gas/liquid two-phase flow to increase shear forces along the membrane and fibre movement is one of the most efficient hydrodynamic approaches. However, the exact effect of aeration still remains incompletely understood, as well as their impact on microbial produced extracellular polymeric substances (EPS), which are considered as an important influencing factor for membrane fouling in MBRs. The following research project focuses on the impact of different aeration intensities on the EPS concentration (proteins and carbohydrates) in the mixed liquor of a MBR pilot fed with original wastewater from a municipal wastewater treatment plant (WWTP). The conducted experiment could not determine a relationship between an increased coarse aeration rate in the membrane module from 0.06 to 1.7 m3 h-1 and a change in the protein and carbohydrate concentration, which could have in principle three reasons. The impact of aeration could have a long-term effect on the EPS variation, which could not been observed in the chosen experimental time frame. Moreover an interference with other non-constant parameters above all the feed water variations was overlapping the effect of additional coarse aeration. Finally it is possible as well that aeration could have no effect on EPS."
Membrane bioreactors (MBR) have become an accepted alternative wastewater treatment to the conventional activated sludge process for both municipal and industrial applications. The main advantage of producing a constant and high quality product water independent of the feed water is facing the serious drawback of elevated energy expenditures mainly caused by membrane fouling. Various improvements and measures were already undertaken to
counteract this phenomenon. The application of a gas/liquid two-phase flow to increase shear forces along the membrane and fibre movement is one of the most efficient hydrodynamic approaches. However, the exact effect of aeration still remains incompletely understood, as well as their impact on microbial produced extracellular polymeric substances (EPS), which are considered as an important influencing factor for membrane fouling in MBRs. The following research project focuses on the impact of different aeration intensities on the EPS concentration (proteins and carbohydrates) in the mixed liquor of a MBR pilot fed with original wastewater from a municipal wastewater treatment plant (WWTP). The conducted experiment could not determine a relationship between an increased coarse aeration rate in the membrane module from 0.06 to 1.7 m3 h-1 and a change in the protein and carbohydrate concentration, which could have in principle three reasons. The impact of aeration could have a long-term effect on the EPS variation, which could not been observed in the chosen experimental time frame. Moreover an interference with other non-constant parameters above all the feed water variations was overlapping the effect of additional coarse aeration. Finally it is possible as well that aeration could have no effect on EPS."
Schlagwörter
Activated sludge process, two-phase flow, aeration
Berichtsjahr
2011