Development Of A Mathematical Model For The
Composting Process
Author(s)
F. Gironi & V. Piemonte
Abstract
Composting is a powerful process for the treatment of the organic fraction of
municipal solid wastes (MSWs), yard and green wastes. The process is
performed aerobically by means of specific micro organisms that utilize organic
matter for their metabolism producing, as metabolites, water, carbon dioxide and
humus (a solid substance that can be utilized for agricultural uses). Composting
of organic solid residues has a positive environmental impact because it reduces
the volume of solid wastes to be landfilled and, consequently, the production of
methane (often characterized by low recovery efficiency) due to the anaerobic
degradation of organic solids. Indeed, the release of methane in the environment
is very dangerous because the effect of methane as greenhouse gas is about 20
times higher than that of carbon dioxide.
In this paper, a mathematical model of the composting process is presented in
order to predict its performance and to contribute to the solution of practical
design problems. Energy and mass balance equations, with typical kinetic
expressions for degradation of organic matter, provide the basis of the
composting model. The process was split into two stages: in the first, the
\“Running phase”, the substrate biodegradation reactions take place, while in the
second, the \“Loading phase”, air and water are supplied to the composting
reactor. The effects of the characteristic time of each phase on the BVS, oxygen
and water concentrations inside the composting reactor were also studied.
Keywords: mathematical model, aerobic composting, simulations.
Keywords
mathematical model, aerobic composting, simulations
Related Book
Other papers in this volume
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