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http://dx.doi.org/10.17137/korrae.2015.23.4.052

Estimation on Affecting Factors and Contribution Rate for Air Permeability of Sawdust as Bulking Agent on Composting  

Kim, Byung Tae (Department of Environmental Engineering, Daejin University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.23, no.4, 2015 , pp. 52-62 More about this Journal
Abstract
This study estimated the contribution rates of inlet air flow, moisture content, air-filled porosity and particle size on the total pressure drop for the sawdust used as the bulking agent in the composting. The statistical model for pressure drop including the affecting factors was proposed.($R^2=0.998{\sim}0.950$) While the laminar air flow(v) and particle size(SIZE*v) had the positive relations to the total pressure drop, the turbulent air flow($v^2$), moisture content(MC*v) and air-filled porosity(AFP*v) had the negative relations. Total pressure drop sharply increased with increasing of the inlet air flow. And the most significant factors affecting to total pressure drop were the particle size(SIZE*v) as positive factor and air-filled porosity(AFP*v) as negative factor. The contribution rate to total pressure drop by the particle size(SIZE*v) was continuously increased with increasing of the inlet air flow, but the contribution rate by air-filled porosity(AFP*v) was decreased. And total pressure drop was little changed even though the increasing of moisture content above the range of dry moisture content 0.25. The contribution rates of affecting factors had the different tendencies with increasing of the moisture content, especially in the negative factors as air-filled porosity(AFP*v) and moisture content(MC*v). For effective composting process, it is preferable to select the sawdust with higher air-filled porosity as bulking agent to enhance the air permeability.
Keywords
composting; pressure drop; air permeability; particle size; contribution rate;
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Times Cited By KSCI : 1  (Citation Analysis)
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