Title: Respirometric characterization of the soluble COD fractions after ultrasonic activated sludge disintegration
Authors: Lambert, Nico
Van Kerckhoven, Kim
Smets, Ilse
Dewil, Raf
Issue Date: Sep-2014
Conference: IWA World Water Congress & Exhibition location:Lisbon, Portugal date:21-26 September 2014
Article number: 2484618
Abstract: Excess sludge treatment and disposal is currently a major challenge in wastewater treatment plants due to associated high costs and environmental regulation factors. Sludge disintegration technology (e.g., ultrasonic sludge disintegrators), can result in a significant reduction of the excess
sludge produced in both municipal and industrial wastewater treatment plants when integrated as a solubilisation step in the sludge recycle of the activated sludge plant. For modelling the process of ultrasonic sludge disintegration, knowledge about the release of soluble COD (sCOD) and soluble Kjeldahl nitrogen (sKN) as a function of the applied specific ultrasonic energy (ES, kJ/kg DS) provides insufficient information to result in a successful sludge disintegration model that is consistent with existing IWA Activated Sludge Models (ASM). In the research proposed in this paper, it was shown that respirometric data can be used to characterize the different COD fractions that are released and converted during the ultrasonic treatment of waste activated sludge. From the experiments it was concluded that the ultrasonically released COD in the supernatant liquid consists for approximately 70% of slowly biodegradable COD (XS), mainly in the form of colloidal particulate material, 20% of readily biodegradable COD (SS), and a remaining part of inert soluble COD (Si). Based on the performed COD fractionation experiments, also a saturation-based solubilisation model was proposed that is compatible with existing ASMs and that describes the ultrasonic sludge disintegration as a function of the specific energy (ES).
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Faculty of Engineering Technology Services, Technology Campus De Nayer Sint-Katelijne-Waver
Bio- & Chemical Systems Technology, Reactor Engineering and Safety Section
Sustainable Chemical Process Technology TC, Technology Campus De Nayer Sint-Katelijne-Waver
Sustainable Chemical Process Technology TC
Department of Health and Technology - UC Leuven

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