Mixing characteristics of sludge simulant in a model anaerobic digester

Low, S.C. ; Eshtiaghi, N. ; Slatter, P. ; Baudez, J.C. ; Parthasarathy, R.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
RHEOLOGY AND MATERIALS PROCESSING CENTRE RMIT UNIVERSITY VICTORIA AUS ; RHEOLOGY AND MATERIALS PROCESSING CENTRE RMIT UNIVERSITY VICTORIA AUS ; ATC WILLIAMS MELBOURNE AUS ; IRSTEA CLERMONT FERRAND UR TSCF FRA ; RHEOLOGY AND MATERIALS PROCESSING CENTRE RMIT UNIVERSITY VICTORIA AUS
Année
2016
Résumé / Abstract
This study aims to investigate the mixing characteristics of a transparent sludge simulant in a mechanically agitated model digester using flow visualisation technique. Video images of the flow patterns were obtained by recording the progress of an acid–base reaction and analysed to determine the active and inactive volumes as a function of time. The doughnut-shaped inactive region formed above and below the impeller in low concentration simulant decreases in size with time and disappears finally. The ‘cavern’ shaped active mixing region formed around the impeller in simulant solutions with higher concentrations increases with increasing agitation time and reaches a steady state equilibrium size, which is a function of specific power input. These results indicate that the active volume is jointly determined by simulant rheology and specific power input. A mathematical correlation is proposed to estimate the active volume as a function of simulant concentration in terms of yield Reynolds number
Source
Bioprocess and Biosystems Engineering, vol. 39, num. 3, p. 473 - 483

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