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A fully Lagrangian computational model for the integration of mixing and biochemical reactions in anaerobic digestion. (English) Zbl 1410.76376

Summary: The impact of mixing on biochemical reactions is of high importance in anaerobic digestion (AD). In this paper, a novel 2D fully Lagrangian computational model for the integration of mixing and biochemical reactions in AD is developed and presented. The mixing-induced fluid flow is modeled by smoothed particle hydrodynamics (SPH). The computational domain is discretized by SPH particles, each of which carries the information of biologically active compounds and follows the flow field. In this natural way, advection is reproduced, which is the main advantage of SPH for this type of problems. A mathematical model that governs the biochemical reactions is integrated in time for each particle, which allows to spatially resolve the biological concentrations. Mass transfer interactions between particles are reproduced by the diffusion equation to directly link mixing to biochemical reactions. The total biogas production is obtained by integrating over all particles. Both SPH and biochemical models are verified against existing data in the literature, and the integrated model is then applied to a real world anaerobic digester. The application of a novel fully Lagrangian method to AD is a stepping stone to future possible developments. However, in the simulation of such problems, SPH is still uncompetitive if compared to other mainstream methods, and industrial application of the model depends on the computational efficiency of future SPH solvers.

MSC:

76M28 Particle methods and lattice-gas methods
65M75 Probabilistic methods, particle methods, etc. for initial value and initial-boundary value problems involving PDEs
92C45 Kinetics in biochemical problems (pharmacokinetics, enzyme kinetics, etc.)

Software:

SPHEROS; gpuSPHASE
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Full Text: DOI

References:

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