Sludge rheology modelling

Sludge rheology may play an important role in CFD modelling of the MBR process as it determines the hydraulics and transport phenomena near the membranes (Rios et al, 2007a). It has been found that activated sludge behaves as a non-Newtonian fluid and therefore the relationship between the shear stress (x) and the shear rate (7) exhibits a power-law (Table 15.3) rather than a linear relationship (Rosenberger et al, 2002 Rios et al, 2007a). [Pg.552]

Rios et al, (2007a) investigated the rheology of activated sludge from the aerobic zone of a lab-scale side-stream MBR with MLSS concentration of 8 g/L.The sludge was concentrated or diluted to obtain 11 different concentrations and correlated with shear rate-stress. The Herschel-Buckley rheology model with Papanastasiou s (H-B-P) adaption was found to exhibit the best fit to the experimental data for MLSS concentrations between 6 and 16 g/L and shear rates between 0.05 and 1600 s h... [Pg.552]

Rios, N, Nopens, I, de Schepper, V, Jiang, T, Verstraete, W and Vanrolleghem, P (2007a). A rheological model for activated sludge in a side-stream MBR . TWA 4th International Membrane Conference, 15-17 May 2007, Harrogate, UK, IWA. [Pg.565]

Inclusion of Herschel-Buddey with Papanastasiou s adaption to model the rheology of wastewater sludge in the water phase... [Pg.684]

Measurement of sludge Rios et al. rheology to calibrate (2007b) viscosity values in the model... [Pg.684]

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