Influence of the non-stirred conditions on the progress of in-vessel composting processes
2006
Seki, H.(Kanazawa Univ. (Japan))
A stochastic model was proposed for in-vessel composting processes under the non-stirred conditions, considering the inhomogeneity of three state variables, that are, content of organic compounds, moisture content, and temperature. Using the value of a stochastic quantum epsilon (unit of discrete change in stochastic variables) estimated on the basis of the experimental results of the temperature inhomogeneity, spatial variations of organic materials and moisture content were estimated by the model. The estimated results of them agreed well with the experimental results at the end of the experiments, and the validity of the proposed model was confirmed. It was theoretically predicted that the value of epsilon becomes smaller and spatial inhomogeneity is smaller when the airflow rate is set as small as possible within a permitted condition for the success of the process. On the other hand, when the value of epsilon is too large, probability of the breakdown of the composting process would become higher.
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