title: Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes.
abstract: This work aimed at assessing water percolation through a solid cow manure leach bed in dry batch AD processes. A laboratory-scale percolation column and an experimental methodology were set up. Water behaviour was modelled by a double porosity medium approach. An experimental procedure was proposed to determine the main hydrodynamic parameters of the multiphase flow model: the porosity, the permeability and the term for water exchange from macro- to micro-porosity. Micro- and macro-porosity values ranged from 0.42 to 0.70 m(3) m(-3) and 0.18 to 0.50 m(3) m(-3). Intrinsic permeability values for solid cow manure ranged from 5.55·10(-11) to 4.75·10(-9) m(2). The term for water exchange was computed using a 2nd order model. The CFD tool developed was used to simulate successive percolation and drainage operations. These results will be used to design leachate recirculation strategies and predict biogas production in full-scale dry AD batch processes.
authors.affiliation: Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France; Cofely INEO GDF Suez, 10 Impasse André Marestan BP 44795, F-31047 Toulouse Cedex 01, France.
authors.forename: Anil
authors.initials: A
authors.lastname: Shewani
authors.affiliation: Université de Toulouse, INPT, UPS, IMFT (Institut de Mécanique des Fluides de Toulouse), Allée Camille Soula, 31400 Toulouse, France; CNRS, IMFT, 31400 Toulouse, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Horgue
authors.affiliation: Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Pommier
authors.affiliation: Université de Toulouse, INPT, UPS, IMFT (Institut de Mécanique des Fluides de Toulouse), Allée Camille Soula, 31400 Toulouse, France; CNRS, IMFT, 31400 Toulouse, France.
authors.forename: Gérald
authors.initials: G
authors.lastname: Debenest
authors.affiliation: Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Lefebvre
authors.affiliation: Cofely INEO GDF Suez, 10 Impasse André Marestan BP 44795, F-31047 Toulouse Cedex 01, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Gandon
authors.affiliation: Université de Toulouse, INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France; INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France; CNRS, UMR5504, F-31400 Toulouse, France. Electronic address: paul@insa-toulouse.fr.
authors.forename: Etienne
authors.initials: E
authors.lastname: Paul
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D061249:Batch Cell Culture Techniques / Q000379:methods*; D002417:Cattle; D003198:Computer Simulation; D008372:Manure / Q000032:analysis*; D010539:Permeability; D016062:Porosity; D012037:Refuse Disposal / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D008372:Manure; D014867:Water
keywords: CFD; Dry batch anaerobic digestion; Leachate percolation; Multiphase flow model; Water distribution