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Characterization and modelling of the heat transfers in a pilot-scale reactor during composting under forced aeration.
Waste Manag. 2012 Jun; 32(6):1091-105.WM

Abstract

The paper focused on the modelling of the heat transfers during composting in a pilot-scale reactor under forced aeration. The model took into account the heat production and the transfers by evaporation, convection between material and gas crossing the material, conduction and surface convection between gas and material in bottom and upper parts of the reactor. The model was adjusted thanks to the measurements practised during fifteen composting experiments in which five organic wastes were, each, composted under three constant aeration rates. Heat production was considered proportional to oxygen consumption rate and the enthalpy per mole oxygen consumed was assumed constant. The convective heat transfer coefficients were determined on basis of the continuous measurements of the temperatures of both the lid and the bottom part of the reactor. The model allowed a satisfying prediction of the temperature of the composting material. In most cases, the mean absolute discard between the experimental and the simulated temperatures was inferior to 2.5°C and the peaks of temperature occurred with less than 8h delay. For the half of the experiments the temperature discard between the simulated peak and the experimental one was inferior to 5°C. On basis of the calculation of a stoichiometric production of water through oxidation of the biodegradable organic matter, the simulation of water going out from material as vapour also allowed a rather satisfying prediction of the mass of water in final mixture. The influence of the aeration rate on every type of heat loss was characterized. Finally, the model was used to evaluate the impacts on material temperature caused by the change of the insulation thickness, the ambient temperature, take the lid away, the increase or the decrease of the mass of waste to compost.

Authors+Show Affiliations

Irstea/Cemagref, UR GERE, 17 Avenue de Cucillé, CS 64427, F-35044 Rennes, France. amaury.de-guardia@irstea.frNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22301461

Citation

de Guardia, A, et al. "Characterization and Modelling of the Heat Transfers in a Pilot-scale Reactor During Composting Under Forced Aeration." Waste Management (New York, N.Y.), vol. 32, no. 6, 2012, pp. 1091-105.
de Guardia A, Petiot C, Benoist JC, et al. Characterization and modelling of the heat transfers in a pilot-scale reactor during composting under forced aeration. Waste Manag. 2012;32(6):1091-105.
de Guardia, A., Petiot, C., Benoist, J. C., & Druilhe, C. (2012). Characterization and modelling of the heat transfers in a pilot-scale reactor during composting under forced aeration. Waste Management (New York, N.Y.), 32(6), 1091-105. https://doi.org/10.1016/j.wasman.2011.12.028
de Guardia A, et al. Characterization and Modelling of the Heat Transfers in a Pilot-scale Reactor During Composting Under Forced Aeration. Waste Manag. 2012;32(6):1091-105. PubMed PMID: 22301461.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization and modelling of the heat transfers in a pilot-scale reactor during composting under forced aeration. AU - de Guardia,A, AU - Petiot,C, AU - Benoist,J C, AU - Druilhe,C, Y1 - 2012/02/01/ PY - 2011/07/28/received PY - 2011/12/22/revised PY - 2011/12/26/accepted PY - 2012/2/4/entrez PY - 2012/2/4/pubmed PY - 2012/10/19/medline SP - 1091 EP - 105 JF - Waste management (New York, N.Y.) JO - Waste Manag VL - 32 IS - 6 N2 - The paper focused on the modelling of the heat transfers during composting in a pilot-scale reactor under forced aeration. The model took into account the heat production and the transfers by evaporation, convection between material and gas crossing the material, conduction and surface convection between gas and material in bottom and upper parts of the reactor. The model was adjusted thanks to the measurements practised during fifteen composting experiments in which five organic wastes were, each, composted under three constant aeration rates. Heat production was considered proportional to oxygen consumption rate and the enthalpy per mole oxygen consumed was assumed constant. The convective heat transfer coefficients were determined on basis of the continuous measurements of the temperatures of both the lid and the bottom part of the reactor. The model allowed a satisfying prediction of the temperature of the composting material. In most cases, the mean absolute discard between the experimental and the simulated temperatures was inferior to 2.5°C and the peaks of temperature occurred with less than 8h delay. For the half of the experiments the temperature discard between the simulated peak and the experimental one was inferior to 5°C. On basis of the calculation of a stoichiometric production of water through oxidation of the biodegradable organic matter, the simulation of water going out from material as vapour also allowed a rather satisfying prediction of the mass of water in final mixture. The influence of the aeration rate on every type of heat loss was characterized. Finally, the model was used to evaluate the impacts on material temperature caused by the change of the insulation thickness, the ambient temperature, take the lid away, the increase or the decrease of the mass of waste to compost. SN - 1879-2456 UR - https://www.unboundmedicine.com/medline/citation/22301461/Characterization_and_modelling_of_the_heat_transfers_in_a_pilot_scale_reactor_during_composting_under_forced_aeration_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0956-053X(12)00004-9 DB - PRIME DP - Unbound Medicine ER -