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CFD simulation of mixing in anaerobic digesters
Authors:Mitsuharu Terashima  Rajeev Goel  Kazuya Komatsu  Hidenari Yasui  Hiroshi Takahashi  Y.Y. Li  Tatsuya Noike
Affiliation:1. Kurita Water Industries Ltd., Gochoyama 1-1, Kawada, Nogi-Machi, Shimotsuga-gun, Tochigi 329-0105, Japan;2. Hydromantis, Inc., 1 James Street South, Suite #1601, Hamilton, ON, Canada L8P 4R5;3. Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu-ku, Kitakyushu 808-0135, Japan;4. Graduate School of Environmental Studies, Tohoku University, Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;5. Department of Civil Engineering, Tohoku University, Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;6. Advanced Research Institute, Nihon University, 4-2-1, Kudan-kita, Chiyoda-ku, Tokyo 102-0073, Japan;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China;2. Centre for Simulation and Modelling of Particulate Systems, Southeast University - Monash University Joint Research Institute, Suzhou 215123, PR China;3. Department of Chemical Engineering, Monash University, Clayton, Vic 3800, Australia;1. Mälardalen University, School of Business, Society & Engineering, PO Box 883, SE-721 23 Västerås, Sweden;2. ABB AB, Corporate Research, SE-721 78 Västerås, Sweden;1. CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vand?uvre-lès-Nancy F-54518, France;2. Université de Lorraine, LRGP, UMR 7274, 2 avenue de la forêt de Haye, TSA 40602, Vand?uvre-lès-Nancy F-54518, France;3. ENSAIA, Université de Lorraine, 2 avenue de la forêt de Haye, TSA 40602, Vand?uvre-lès-Nancy F-54518, France;1. Beijing Key Laboratory of Membrane Science and Technology & College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China;2. Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA;3. Biomass Energy and Environmental Engineering Research Center, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China;4. Petrochemicals Research Chair, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;1. Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA;2. Department of Mathematics, Washington State University, Pullman, WA 99164, USA;3. Department of Environmental Science and Engineering, Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Abstract:
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.
Keywords:
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