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Water Science & Technology Vol 42 No 9 pp 73–80 © IWA Publishing 2000 Enhancement of anaerobic sludge digestion by ultrasonic disintegrationU Neis*, K Nickel** and A Tiehm****
Department of Sanitary Engineering, Technical University of Hamburg-Harburg,
21071 Hamburg, Germany
ABSTRACT Biological cell lysis is known to be the rate limiting step of anaerobic sludge stabilization. Shear forces generated by high-power ultrasound can be used to disintegrate bacterial cells in sewage sludge. Thus the quantity of bioavailable dissolved organic substrate (Chemical Oxygen Demand) is significantly increased. As a result the subsequent sludge degradation is accelerated considerably. In our tests the fermentation process of sonicated waste activated sludge remained stable even at a very short digestion time of 4 days. The enhanced degradation rate resulted in a reduced volatile solids concentration of the digested sludges after the usual fermentation times. eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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