Numerical model for the dynamic simulation of a large scale composting system

dc.contributor.author	Das, K	en
dc.contributor.author	Keener, HM	en
dc.date.accessioned	2014-06-06T06:43:15Z
dc.date.available	2014-06-06T06:43:15Z
dc.date.issued	1997	en
dc.identifier.issn	00012351	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1128
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031195077&partnerID=40&md5=b2fff09e8e19df6ff5bdab7e8dd0598d	en
dc.subject	Biosolids	en
dc.subject	Compost	en
dc.subject	Numerical modeling	en
dc.subject	Simulation	en
dc.subject	Waste management	en
dc.subject.other	Biosolids	en
dc.subject.other	Waste management	en
dc.subject.other	Compressibility of solids	en
dc.subject.other	Computer simulation	en
dc.subject.other	Degradation	en
dc.subject.other	Flow patterns	en
dc.subject.other	Heat transfer	en
dc.subject.other	Mass transfer	en
dc.subject.other	Numerical methods	en
dc.subject.other	Waste disposal	en
dc.subject.other	Composting	en
dc.title	Numerical model for the dynamic simulation of a large scale composting system	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	A numerical model simulating airflow pattern, heat and mass transfer, and degradation in the two dimensional cross-section of a deep bed composting vessel was developed. The model accounts for compressibility of the material and predicts spatial and temporal changes in state variables. The model was validated at a commercial facility that composts a mix of biosolids, bark and sawdust. Simulations were performed to quantify the effects of (1) initial moisture level, (2) depth of bed, (3) ambient air temperature, (4) cooling air recirculation, (5) material degradability and (6) blockage of plenum, on cost of aeration and spatial homogeneity of degradation within the vessel. Results show that cost of aeration is lowest when the material is at an initial moisture level of 55% and the bed depth is 3.5 m. Energy required per unit of dry matter degraded decreases as the ambient temperature increases. The increased aeration requirement when cooling air was recirculated was quantified, and shows that overall energy requirements are reduced by recirculating air. Aeration energy requirements and system throughput were compared under different operating parameters.	en
heal.journalName	Transactions of the American Society of Agricultural Engineers	en
dc.identifier.issue	4	en
dc.identifier.volume	40	en
dc.identifier.spage	1179	en
dc.identifier.epage	1189	en