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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9234

Title: Thermal balance of invessel composting of tomato plant residues
Authors: Ghaly
F. Alkoaik
Issue Date: 5-Dec-2010
Abstract: Biological Engineering Department, Dalhousie University, P.O. Box 1000, Halifax, Nova Scotia B3J 2K9, Canada. *Email: abdel.ghaly@dal.ca Ghaly, A.E., Alkoaik, F. and Snow, A. 2006. Thermal balance of invessel composting oftomato plant residues. Canadian Biosystems EngineeringlLe genie des biosystemes au Canada 48: 6.1 - 6.11. Heat and mass balances were performed on an insulated laboratory compo sting bioreactor operating on tomato plant residues. Wood shavings and municipal solid compost were used as a bulking agent and an inoculum, respectively. The moisture content and C:N ratio were maintained at 60% and 30:1, respectively. The temperature peaked after 31 h of operation reaching 63.3 °C and lasted for 9 h. The result of the thermal analysis indicated that the average heat production value was 14.6 MJ/kg DM degraded. The conductive heat losses through the cylindrical body and the sidewalls of the bioreactor accounted for 30.0% of the total cumulative heat produced, whereas the heat loss due to aeration accounted for 61.0% and the heat gained by the compost and bioreactor materials accounted for the remaining 9.0%. Keywords: compost, bioavailable carbon, tomato residues, wood shavings, nitrogen, carbohydrate, protein, fat, temperature. Des bilans de masse et de chaleur ont ete realises sur un bioreacteur isole pour Ie compostage en laboratoire de residus de plants de tomate. Des copeaux de bois ont ete utilises comme substrat et du compost de solides municipaux a servi d'inoculant pour Ie precede. La teneur en eau et le ratio C:N ont etc maintenus respectivement a 60% et 30: 1. Une temperature maximale de 63.3°C a etc observee apres 31 heures doperation et cette temperature a pu etre maintenue durant neufheures. Les resultats de I' analyse thermique ont indique que la valeur moyenne de production de chaleur durant Ie processus de compostage a atteint 14,6 MJ par kilogramme de matiere seche degradee. Les pertes de chaleur par conduction au travers des parois du bioreacteur se sont elevees a 30,0% de la chaleur totale produite tandis que les pertes de chaleur liees a I'aeration ont atteint 61,0% alors que la chaleur accumulee par Ie compost et Ie bioreacteur lui-meme representaient les 9,0% restant. Mots cles: compost, carbone biolo giquement disponible, residus de tomates, copeaux de bois, azote, hydrate de carbone, proteine, gras, temperature
URI: http://hdl.handle.net/123456789/9234
Appears in Collections:College of Foods And Agricultural Science

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