Euler-Lagrange CFD modelling of unconfined gas mixing in anaerobic digestion.

A novel Euler-Lagrangian (EL) computational fluid dynamics (CFD) finite volume-based model to simulate the gas mixing of sludge for anaerobic digestion is developed and described. Fluid motion is driven by momentum transfer from bubbles to liquid. Model validation is undertaken by assessing the flow field in a labscale model with particle image velocimetry (PIV). Conclusions are drawn about the upscaling and applicability of the model to full-scale problems, and recommendations are given for optimum application.

[1]  J. Boon.  The Lattice Boltzmann Equation for Fluid Dynamics and Beyond , 2003 .

[2]  D. Wolf-Gladrow.  Lattice-Gas Cellular Automata and Lattice Boltzmann Models: An Introduction , 2000 .

[3]  Ng Niels Deen,et al.  Multi-scale modeling of dispersed gas-liquid two-phase flow , 2004 .

[4]  Binxin Wu,et al.  CFD simulation of gas mixing in anaerobic digesters , 2014 .

[5]  J. Bridgeman,et al.  Velocity gradient as a tool to characterise the link between mixing and biogas production in anaerobic waste digesters. , 2013, Water science and technology : a journal of the International Association on Water Pollution Research.

[6]  Nicholas F. Gray,et al.  Water technology an introduction for environmental scientists and engineers , 2010 .

[7]  R. Benzi,et al.  The lattice Boltzmann equation: theory and applications , 1992 .

[8]  Alastair J Ward,et al.  Optimisation of the anaerobic digestion of agricultural resources. , 2008, Bioresource technology.

[9]  Binxin Wu.  Integration of mixing, heat transfer, and biochemical reaction kinetics in anaerobic methane fermentation , 2012, Biotechnology and bioengineering.

[10]  K. McMahon,et al.  Anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions--I. Digester performance. , 2001, Water research.

[11]  Jos Derksen,et al.  Modeling of aerated stirred tanks with shear-thinning power law liquids , 2012 .

[12]  K. Hoffmann,et al.  Computational Fluid Dynamics for Engineers , 1989 .

[13]  Jos Derksen,et al.  Modeling of turbulent gas-liquid bubbly flows using stochastic Lagrangian model and lattice-Boltzmann scheme , 2011 .

[14]  Hiroshi Takahashi,et al.  CFD simulation of mixing in anaerobic digesters. , 2009, Bioresource technology.

[15]  A. Almstedt,et al.  Methods for multiphase computational fluid dynamics , 2003 .

[16]  Muthanna Al-Dahhan,et al.  Flow pattern visualization in a mimic anaerobic digester using CFD. , 2005, Biotechnology and bioengineering.

[17]  Hidesada Tamai,et al.  Transverse migration of single bubbles in simple shear flows , 2002 .

[18]  M. Al-Dahhan,et al.  Gas-lift digester configuration effects on mixing effectiveness. , 2007, Water research.

[19]  Mark M. Clark.  Critique of Camp and Stein's RMS Velocity Gradient , 1985 .

[20]  Philip R. Goodrich,et al.  Rheological properties of Moroccan dairy cattle manure , 1992 .

[21]  S. Succi.  The Lattice Boltzmann Equation for Fluid Dynamics and Beyond , 2001 .

[22]  P. Roache.  Verification of Codes and Calculations , 1998 .

[23]  Argyrios Margaritis,et al.  Hydrodynamic characteristics of free rise of light solid particles and gas bubbles in non-Newtonian liquids , 1999 .

[24]  Paul Slatter,et al.  The impact of temperature on the rheological behaviour of anaerobic digested sludge , 2013 .

[25]  P. F. Greenfield,et al.  Effect of Mixing on Biomethanation of Cattle-Manure Slurry , 2002, Environmental technology.

[26]  Binxin Wu,et al.  CFD simulation of non‐Newtonian fluid flow in anaerobic digesters , 2008, Biotechnology and bioengineering.

[27]  Xiomar Gómez,et al.  Anaerobic co-digestion of primary sludge and the fruit and vegetable fraction of the municipal solid wastes: Conditions for mixing and evaluation of the organic loading rate , 2006 .

[28]  K. McMahon,et al.  Anaerobic codigestion of municipal solid waste and biosolids under various mixing conditions--II: Microbial population dynamics. , 2001, Water research.

[29]  Binxin Wu,et al.  CFD simulation of gas and non-Newtonian fluid two-phase flow in anaerobic digesters. , 2010, Water research.

[30]  B. Launder,et al.  Ground effects on pressure fluctuations in the atmospheric boundary layer , 1978, Journal of Fluid Mechanics.

[31]  Grietje Zeeman,et al.  Rheological properties of dairy cattle manure. , 2005, Bioresource technology.

[32]  J. Bridgeman,et al.  Computational fluid dynamics modelling of sewage sludge mixing in an anaerobic digester , 2012, Adv. Eng. Softw..

[33]  Bengt Andersson,et al.  Computational Fluid Dynamics for Engineers , 2011 .

[34]  Weeratunge Malalasekera,et al.  An introduction to computational fluid dynamics - the finite volume method , 2007 .