Simulating Landfill Aeration Systems Using Computational Fluid Dynamics Techniques

Abstract eng:
The present study is an application of Computational Fluid Dynamics (CFD) on the numerical modeling of aeration systems of uncontrolled landfills. More specifically, the CFD algorithms provided by the commercial solver ANSYS Fluent 14.5, combined with an in-house source code developed to complement the main solver was used. Coupling the multiphase flow with a biochemical algorithm, the complex biochemical process of organic solid waste stabilization using aeration was simulated. Air was considered to enter the solid waste region which was partially saturated, using aeration wells. Multiphase flow both for the air and liquid phase was simulated taking into consideration the oxygen (O2) transfer across phases. Unsaturated flow effects, such as capillary pressure and unsaturated hydraulic conductivity, were taken into consideration during the simulation using proper functions that were included in the main solver. After the initial model set up, a sensitivity analysis for basic biochemical parameters was implemented, examining the effect of various kinetic parameters variation. Moreover, pilot scale simulations were performed. The results obtained were in good agreement with corresponding previous experimental and computational results of the literature. Finally, a case study was simulated for a hypothetical landfill aeration well.

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