Impact of temperature on raw wastewater composition and activated sludge filterability in full-scale MBR systems for municipal sewage treatment

The main objective of this study was to investigate the influence of seasonal temperature fluctuations on raw domestic wastewater composition and MBR sludge filterability. The influent and sludge samples were collected from a full-scale MBR in Heenvliet. All samples were analyzed in terms of filtera...

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Bibliographic Details
Published in:Journal of membrane science 2012-12, Vol.423-424, p.348-361
Main Authors: Krzeminski, P., Iglesias-Obelleiro, A., Madebo, G., Garrido, J.M., van der Graaf, J.H.J.M., van Lier, J.B.
Format: Article
Language:English
Subjects:
activated sludge
Activated sludge filterability
artificial membranes
bioactive properties
Biodegradability
biodegradation
biomass
DFCm
filterability
fractionation
Membrane bioreactor (MBR)
particle size distribution
Raw wastewater composition
seasonal variation
sewage treatment
Soluble compounds
temperature
Temperature influence
wastewater
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Summary:The main objective of this study was to investigate the influence of seasonal temperature fluctuations on raw domestic wastewater composition and MBR sludge filterability. The influent and sludge samples were collected from a full-scale MBR in Heenvliet. All samples were analyzed in terms of filterability, particle size distribution, respirometry, fractionation and were further characterized by an extensive set of physicochemical measurements. Typical seasonal fluctuations and deterioration of activated sludge filterability during low temperature periods were observed. Filterability deterioration at low temperatures was linked to the incoming organic load, reduced MBR biomass concentrations, increased VSS/TSS ratio and reduced biodegradation of wastewater in the mixed liquor. Biological activity of the biomass was concomitantly decreased with temperature to reach a minimum during the winter period. Results show that the colloidal and soluble fraction (
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2012.08.032