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KMID : 0380020070220020097
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Korean Journal of Biotechnology and Bioengineering
2007 Volume.22 No. 2 p.97 ~ p.101
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Anaerobic Digestion Efficiency of Remainder from Bacterial Cellulose Production Process using Food Wastes
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Kim Sung-Dug
Kim Seong-Jun
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Abstract
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This study was performed to examine the availability of anaerobic digestion of the remainders caused by bacterial cellulose production process using food wastes. They maybe to be considered as others second pollution sources. Thus, this study was targeted to minimize content of organic material and to obtain more energy in those remnants using two-phase UASB reactor. The working volume of first hydrolysis fermentor was 35 L (total 55 L) and the second methane fermentor was 40 L (total 50 L). The organic loading rate of hydrolysis fermentor was 3 g-VS/L·day and 25,000 ppm of CODcr for methane fermentor. The hydraulic retention time was 18 days for hydrolysis reactor and 33 days for methane reactor. The hydrolysis reactor and methane reactor were performed at 35, 40℃ respectively. For the efficient stable performance, the composition of organic wastes at each stage was as follow; Food waste with bacterial culture remnants (1 : 1), bacterial cellulose remnants, bacterial cellulose culture remnants with food wastes saccharified solids (1 : 1). When the anaerobic digestion was performed stably at each stage, the COD removal efficiency was 88, 90, 91% respectively. At this time, methane production rate was 0.26, 0.34, 0.32 m3 CH4/kg-CODremove. As well as the values of anaerobic digestion at third stage were more higher than values of anaerobic digestion using food wastes. It is clearly to say that the food wastes zero-emission system constructed in our lab is more efficient way to treat and reclaim food wastes
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KEYWORD
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Food wastes, anaerobic digestion, methane, zero-emission, UASB
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