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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2006; 34(4): 363-367

음식물 쓰레기 분해에 대한 고온성 미생물의 영향

Effect of Thermophilic Bacteria on Degradation of Food Wastes

Hwe-Su Yi , Ji-Hyung Jeong , Yu-Mi Park , Keyung-Jo Seul and Sa-Youl Ghim

Department of Microbiology, Kyungpook National University, 1Agro-Biotechnology Education Center, NURI, Kyungpook National University, 2Department of Microbiology, Kyungpook National University, 3Department of Microbiology, Kyungpook National University, 4Department of Microbiology, Kyungpook National University

Abstract

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Food wastes were decomposed into the Mugri (Isung Engineering, Korea), a food waste reduction machine, with adding sawdust of cryptomeria. Degradation effects were better when the machine worked at over 45$^{circ}C$ than those at the lower temperature. Thermophilic bacteria were isolated from cryptomeria sawdust and the food waste products degraded by the machine. The isolates from cryptomeria sawdust were classified into 3 genera (Acinetobacter baumannii, Enterobacter sp. and Erwinia cypripedii) and almost all the isolates from the degraded products were partially identified as Bacillus sp. by 16S rDNA sequence analysis. The isolated thermophilic bacteria showed degradative enzyme activities. In the case of addition of the 30 thermophilic bacteria into the machine, degradation rate of food wastes was almost twice as high with increasing process temperature up to 6$^{circ}C$.

Keywords: Thermophile, food wastes, amylase, cellulase, protease, lipase

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