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http://dx.doi.org/10.17137/korrae.2021.29.4.55

The Determination of Anaerobic Biodegradability and Organic Fractionation of Agricultural Byproducts by Biochemical Methane Potential Assay Using Double First-Order Kinetic Model  

Shin, Kook-Sik (Biogas Research Center, Hankyong National University)
Yoon, Young-Man (Biogas Research Center, Hankyong National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.29, no.4, 2021 , pp. 55-65 More about this Journal
Abstract
This study investigated methane productions and a degradation rate of organic matters by German standard method, VDI4630 test. In this study, 11 waste biomasses from agricultural fields were selected for the investigation. The objective of this study was to estimate a distribution of organic matters by using the Double first-order kinetics model in order to calculate the rate of biodegradable organic matters which degrade rapidly in the initial stage and the persistently biodegradable organic matters which degrade slowly later. As a result, all the biomasses applied in this study showed rapid decomposition in the initial stage. Then the decomposition rate began to slow down for a certain period and the rate became 10 times slower than the initial decomposition rate. This trend of decomposition rate changes is typical conditions of biomass decompositions. The easily degradable factors (k1) were raged between 0.097~0.152 day-1 from vegetable crops and persistent degradable factor (k2) were 0.002~0.024 day-1. Among these results, greater organic matter decomposition rates from VDI4630 had greater k1 values (0.152, 0.144day-1) and smaller k1 values (0.002, 0.005day-1) from cucumbers and paprika. In a meanwhile, radishes and tangerine rinds which had low decomposition rates showed 0.097 and 0.094 day-1 of k1 values and decomposition rates seems to affect k1 values.
Keywords
Anaerobic digestion; Biochemical methane potential (BMP); Agricultural biomass; Kinetic model;
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