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Biogas production from food waste using semi-continuous anaerobic digester
이슬람 ( M. N. Islam ),윤형선 ( H. S. Yoon ),송형운 ( H. W. Song ),박금주 ( K. J. Park ) 한국농업기계학회 2011 한국농업기계학회 학술발표논문집 Vol.16 No.1
Incineration is not suitable due to the high moisture contents and low heating value of food waste. So, mesophilic anaerobic digestion has been one of the most favorable options for food waste disposal. In this study, the biogas production from food waste was investigated using lab scale semi-continuous stirred tank reactor (SCSTR) at 35℃ with 30d HRT and 30L working volume. The mesophilic digestion test was performed with three different feed materials (food waste) and food to microorganism (F/M) ratios (0.13, 0.34, and 0.27) in the same experiment. The results showed that the F/M ratios significantly affected the biogas production rate. The highest production rate was obtained at F/M ratio of 0.13. Biogas produced in anaerobic digestion consists of 68.7% CH4 and 31.2% CO<sub>2</sub>. The average biogas and methane production of digester were 29.96 L/Kg VS day<sup>-1</sup> and 20.58 L/Kg VS day<sup>-1</sup>, respectively. The CH<sub>4</sub> could be calculated as the heat energy 1.85 Kcal/Kg VS day<sup>-1</sup>. The digestion was operated without addition of chemicals or nutrients into the system.
재생 불량성 빈혈 및 골수 이형성군 환자의 요중 Erythropoietin 활성도의 Bioassay
이봉휘,정문성,지영구,남홍우,송형운,한창순,한치화,박종원,김춘추,--,김창규 대한내과학회 1990 대한내과학회지 Vol.38 No.5
Erythropoietin, a glycoprotein hormone, has an important and well-established role in regulating the developement of RBCs from committed erythropoietic precussor. Its activity can be measured by bioassay or RIA. Recently, we investigated urinary erythropoietin activity in A. A. patients and MDS patients by bioassay and RIA. In bioassay, we used as 3H-thymidine incorperation method to BACB-C mouse spleen cell. Thereafter we compared urinary Epo. acitivity in each disease group and like to find out prognostic significance to be influenced. The results were summarized as follows; 1. The urinary Epo. activities of the A.A. and MDS groups were higher than those of the normal control gorup. and the urinary Epo. activities of the A.A. group showed a marked increase over those of the MDS group (105.5±81.6 vs 1.7±1.5). But the after immune modulation therapyu, urinary Epo. acitivities of the A.A. group markedly decreased to the normal value (105.5±81.6 vs 1.8±1.7, p<0.001). 2. Age and sex differences were not related with urinary Epo. activities in each goup. 3. The hematocrits of the A.A. group did not correlate with any the urinary Epo. acitivities, but an inverse correlation was found in the MDS group. 4. The urinary Epo. activities measured by RIA were higher than those measured by bioassay, but there was a close corrlation between the two methods(R=0. 8, p< 0.001).