Foaming in anaerobic digesters has severe impacts on process efficiency and operational costs. In this study, we present an experimental method to determine foam behaviour and stability for various foaming solutions. This novel technique measured foam conductivity at different heights along a foam column allowing changes in foam composition to be monitored in time. We analysed foam stability which is primarily dependent on the foam drainage velocity, a quantity that can be determined from forced drainage experiments. The drainage velocity increased in the presence of anaerobic digester sludge, compared to simple surfactant foam. We proposed a new understanding of the effect of sludge particles on the foam stability. Both physical properties (foam physical constant, β) of foam and bubble surface interactions by applying stable and unstable foam in addition of surfactants are also evaluated and discussed.
Research Article|June 01 2013
A novel technique for evaluating foam dynamics in anaerobic digesters
1Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, California 94720, USA2Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul 136-791, South Korea
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S. W. Hermanowicz
C. Park, S. W. Hermanowicz, D. Jolis; A novel technique for evaluating foam dynamics in anaerobic digesters. Water Sci Technol 1 June 2013; 67 (11): 2595–2601. doi: https://doi.org/10.2166/wst.2013.160
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