Assessment of Solute Transfer Between Static and Dynamic Water During Percolation Through a Solid Leach Bed in Dry Batch Anaerobic Digestion Processes

Anil Shewani (1, 2) , Pierre Horgue (3) , Sébastien Pommier (1) , Gérald Debenest (3, 4, 5) , Xavier Lefebvre (1) , Sophie Decremps (2) , Etienne Paul (1, 4)

1 LISBP - Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés
2 GDF Suez - Gaz de France Suez
3 IMFT - Institut de mécanique des fluides de Toulouse
4 INSA Toulouse - Institut National des Sciences Appliquées - Toulouse
5 Département GPE

The aim of this work was to characterize solute transfer between static and dynamic water during percolation through a solid leach bed reactor. A new experimental procedure was set up to measure the solute exchange rate between macro-and micro-porosity. Tracer tests were performed in closed-circuit recirculation experiments. The water behavior was modeled by a multiphase flow model in a double porosity medium using a previously published methodology. The solute exchange rate between static and dynamic water was described by first-order kinetics. The methodology was applied to wheat straw and solid cow manure beds. The solute exchange rate (hs was 0.054 and 0.324 h−1) for wheat straw and solid cow manure, respectively. The measured data was used to improve the prediction capacity of a CFD tool. The results of this work could be used to develop appropriate leachate recirculation strategies to optimize full-scale dry batch anaerobic digestion processes.

Mots clés: Dry batch anaerobic digestion; Double porosity; Leachate percolation; Solute exchange

Domaines: Mécanique des fluides [physics.class-ph]

Anil Shewani, Pierre Horgue, Sébastien Pommier, Gérald Debenest, Xavier Lefebvre, et al.. Assessment of Solute Transfer Between Static and Dynamic Water During Percolation Through a Solid Leach Bed in Dry Batch Anaerobic Digestion Processes. Waste and Biomass Valorization, 2018, 9 (11), pp.2081-2089. ⟨10.1007/s12649-017-0011-1⟩. ⟨hal-01795178⟩