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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE. Vol. 45(4): 1239–1250 . (doi: 10.13031/2013.9954) @2002
Authors:   H. Seki
Keywords:   Batch–type unturned composting process, Macroscopic model, Megascopic model, Liquid water transfer, Heat conduction, Volume reduction

There has been thus far no satisfactory model on composting that affords us locally detailed and holistic information because the composting process is a multicomponent, multiphase, and heterogeneous system. In this article, a new deterministic model to simulate a batchtype unturned composting process is presented. The model includes the effects of volume decrease, heat conduction, and liquid water transfer, and seems to predict the empirical results of changes in moisture content, substrate concentration, and temperature. The model was converted into a megascopic model by integrating basic equations for state variables over the entire volume of the compost mass. Although the megascopic model may not well simulate a reaction delay due to nonuniformity of the compost mass, it can be used for rough estimates of changes in state variables in batchtype composting processes.

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