Aerobic granular sludge in an SBR-system treating wastewater rich in particulate matter.
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.
Institute of Water Quality Control and Waste Management, Technical University of Munich, Am Coulombwall, Garching, Germany. N.Schwarzenbeck@bv.tum.de
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Erley
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Wilderer
D000818:Animals; D001420:Bacteria, Aerobic / Q000254:growth & development*; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors; D056890:Eukaryota / Q000254:growth & development; D010316:Particle Size; D011157:Population Dynamics; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods
D012722:Sewage