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Updated: Aug 23, 2026

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
Published on: September 26, 2016
Aerobic granular sludge in an SBR-system treating wastewater rich in particulate matter
N Schwarzenbeck1, R Erley, P A Wilderer
1Institute of Water Quality Control and Waste Management, Technical University of Munich, Am Coulombwall, Garching, Germany. N.Schwarzenbeck@bv.tum.de
Abstract:
Aerobic granular sludge was successfully cultivated in a lab-scale SBR-system treating malting wastewater with a high content of particulate organic matter (0.9 gTSS/L). At an organic loading rate (CODtotal) of 3.4 kg/(m3 x d) an average removal efficiency of 50% in CODtotal and 80% in CODdissolved was achieved. Fractionation of the COD by means of particle size showed that particles with a diameter less than 25-50 microm could be removed at 80% efficiency, whereas particles bigger than 50 microm were only removed at 40% efficiency. Tracer experiments revealed a dense sessile protozoa population covering the granules. The protozoa appeared to be responsible for primary particle uptake from the wastewater.
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