CFD simulation of mixing in anaerobic digesters.
A three-dimensional CFD model incorporating the rheological properties of sludge was developed and applied to quantify mixing in a full-scale anaerobic digester. The results of the model were found to be in good agreement with experimental tracer response curve. In order to predict the dynamics of mixing, a new parameter, UI (uniformity index) was defined. The visual patterns of tracer mixing in simulation were well reflected in the dynamic variation in the value of UI. The developed model and methods were applied to determine the required time for complete mixing in a full-scale digester at different solid concentrations. This information on mixing time is considered to be useful in optimizing the feeding cycles for better digester performance.
Terashima
Mitsuharu
M
Kurita Water Industries Ltd, Shimotsuga-gun, Tochigi, Japan. mitsuharu_terashima@hotmail.com
Goel
Rajeev
R
Komatsu
Kazuya
K
Yasui
Hidenari
H
Takahashi
Hiroshi
H
Li
Y Y
YY
Noike
Tatsuya
T
D000693:Anaerobiosis; D019149:Bioreactors; D003198:Computer Simulation; D008956:Models, Chemical; D012212:Rheology; D012722:Sewage; D013997:Time Factors
D012722:Sewage