A novel technique for evaluating foam dynamics in anaerobic digesters
- A novel technique for evaluating foam dynamics in anaerobic digesters
- 박찬혁; Slawomir W. Hermanowicz; Domenec Jolis
- Anaerobic sludge; Conductivity; Drainage; Foam stability
- Issue Date
- Water science and technology
- VOL 67, NO 11, 2595-2601
- 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.
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