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과실폐기물을 이용한 바이오 에탄올 생산 및 연료 적합성
이기완 ( Ki-wan Lee ),김동묵 ( Dong-mook Kim ),조재일 ( Jae-il Cho ),이진식 ( Jin-sik Lee ),이상균 ( Sang-gyun Lee ),박중근 ( Jung-geun Park ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.5
본 연구에서는 당질계 폐기물인 배, 감, 사과 등의 과육을 제외한 껍질과 씨방을 기질로 하여 바이오에탄올 생산을 위한 처리 및 가수분해효율 실험을 수행하였다. 생산된 바이오에탄올의 효율성과 실제 연료로서의 적합성 평가를 위하여 가솔린의 품질규제와 동일한 항목의 실험으로 몇가지 유의성 결과를 도출하였던 바, 다른 과실폐기물에 비하여 배의 glucose의 양이 498.3±0.1로 매우 높게 나온 것으로 확인이 되었고, 문헌으로 보고된 음식물 쓰레기의 수율보다 0.03 g ethanol/gsolid가 높아 배 과실폐기물의 우수한 바이오매스 활용 가능성을 확인하였으며, 그 증기압은 다른 기질의 바이오 에탄올보다 1/2 이하로 낮은 장점이 있는 것으로 나타났다. In this study, the experiments using glucidic fruit wastes as a substrate for the treatment and hydrolysis efficiency were carried out to produce bioethanol. To evaluate the efficiency and applicability of the produced ethanol fuel, we performed the same qualified specific experiments suited for the actual Gasoline Regulations. As a result of these experiments, a few significant results were derived. In other words, the amount of pear`s glucose from 498.3 ± 0.1 to a very high resolution was even much extracted as compared with other fruit wastes. We confirmed the possibility for use of the biomass because our experimental results as 0.03 g ethanol / g solid were higher than the yield of the food waste of the existing other studies. We also found that the vapor pressures of these experiments in comparison with those of bioethanols of different materials were lower than half.5
증기가압형 처리공정에 의한 유기성 폐기물의 대체에너지화에 관한 연구
이기완 ( Ki-wan Lee ),조재일 ( Jae- Il Jo ),박중근 ( Jung-geun Park ),이진식 ( Jin-sik Lee ),김우중 ( Woo-jung Kim ),정인철 ( In-cheol Jeong ) 한국환경기술학회 2014 한국환경기술학회지 Vol.15 No.2
본 연구에서는 증기가압형 처리공정에 의한 유기성 폐기물의 대체에너지화의 Lab. scale 실험을 수행하였다. 대상 유기성 폐기물에 대한 열중량분석 실시 결과, 열분해 반응 이후 8% 정도의 잔류물 존재를 확인하였고, 증기가압형 처리공정에 의해 처리된 축분 및 하수슬러지는 24시간 자연건조 후 각각 94%, 87%의 무게 감량을 보였으며, 고형연료화를 위한 고형분 회수율은 각각 약 6%, 13% 수준으로 평가되었다. 또한, 개발된 건조 및 고형연료화 공정은 폐비닐과 혼합하여 6,000kcal/kg 이상의 발열량을 갖는 고형 연료 생산이 가능하므로 환경오염 부하의 저감과 폐기물의 에너지자원화를 동시에 충족시킬 수 있는 친환경 에너지기술로 평가 되었다. 고형 연료는 대단위 화력발전이나 분산형 열병합발전의 연료, 비닐하우스나 대단위 가축 사육시설 등의 기름보일러 대체 에너지원으로 활용 가능할 것으로 사료된다. This paper investigates the dehydration and RDF (Refuse Derived Fuel) production of organic wastes, livestock manure and sewerage sludge with pressurized hydrothermal treatment process. The renewable technology for the organic wastes must involve short treatment time required, reusable energy source, anti-odor and viruses, low cost for the treatment, and well-fertilization. The pressurized hydrothermal treatment process promotes to evaporate moisture in the waste after being shortly treated in a reactor, which uses steam and heat supplied by an external boiler. By the pressurized steam, the cell walls of the waste break and effectively release the internal moisture. Then, the dried waste can be mixed with waste vinyls to produce RDF with a higher heating value as high as 6,700 kcal/kg.
김승언 ( Seung Eon Kim ),정희원 ( Hi Won Jeong ),현용택 ( Yong Taek Hyun ),이동근 ( Dong Keun Lee ),이용태 ( Yong Tai Lee ),박중근 ( Joong Keun Park ),이준희 ( Jun Hee Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.6
Alloy design and in-vitro assessment of biocompatibilities of novel titanium alloys with low elastic modulus were studied. A contour map of elastic modulus which enables to predict low modulus alloy composition was established by using electron theory. Ti-30Ta-10Nb-10Zr, Ti-40Ta-10Nb-10Zr and Ti-40Ta10Nb-4Sn alloys were designed by using the contour map of elastic modulus, and Young`s moduli of those alloys were as low as around 60 GPa. Anodic polarization curves for the alloys represented that corrosion resistance of Ti-40Ta-10Nb-10Zr and Ti-40Ta-10Nb-10Zr was comparable to those of biomedically approved CP Ti and Ti-6Al-4V in simulated body fluid(Hank`s solution) at 37℃, while corrosion resistance of Ti-40Ta-10Nb-4Sn was inferior to those of CP Ti and Ti-6Al-4V. MTT assay with osteoblast-like cells(MG63) showed that the extent of initial cell attachment was similar in all alloys, while cell proliferation of Ti-40Ta-l0Nb10Zr and Ti-40Ta-10Nb-4Sn alloys was more sluggish than those in CP Ti and Ti-6Al-4V. It was therefore realized that the selection of alloying elements for designing low modulus alloys should be considered in the viewpoint of cell growth as well as cytotoxicity.
박중근 ( Jung Geun Park ),이여진 ( Yeo Jin Lee ),윤준용 ( Joon Yong Yoon ),엄애선 ( Ae Son Om ) 한국유가공기술과학회 2015 Journal of Dairy Science and Biotechnology (JMSB) Vol.33 No.3
Milk is a food with high nutritional value as it contains abundant water, proteins, vitamins, lactose, fat, minerals, enzymes, etc. However, in order to make milk suitable for intake, it should be thermally treated to eliminate microbiologically hazardous factors. Heat treatment is an essential sanitation process for milk, but various precautions must be taken in order to process and preserve it. Therefore, various techniques should be developed to minimize the nutrient loss and to ensure that milk is safe for consumption, conservation, and distribution. However, the existing thermal pasteurization methods are harmful and increase the nutrient loss; moreover, no new thermal pasteurization methods are being researched that are safe for the human health and minimize the nutrient loss. Hence, this study aims to review new processes for thermal (low temperatures) and no thermal pasteurization methods that can minimize the nutrient loss during milk pasteurization.
Histidylleucine Hydrolyzing Enzyme : A Dipeptidase From Hog Lung
이현재,박중근,Hyun-Jae Lee,Jung-Keun Park Korean Chemical Society 1975 대한화학회지 Vol.19 No.5
돼지의 폐(lung)로 부터 histidylleucine dipeptide를 가수분해 시키는 효소를 추출 정제 하였으며, 정제된 효소의 비활성도는 $1.6{\mu}moles$/min/mg protein(약 50배 정제)이었다. 이 새로운 dipeptidase의 분자량은 sucrose density gradient 원심침강법에 의하여 측정한 결과 약 80,000 daltons이었으며 효소의 기질 물질로서 요구되는 조건은 방향족 잔기를 갖는 dipeptide를 필요로 하나 histidylleucine을 기질로 사용하였을 경우 $K_m$ 값은 $2{\times}10^{-4}M$이었다. 본문에서는 이효소의 일반적 특성과 그 밖의 생리학적 및 생화학적 기능에 관하여 검토하였다. An enzyme capable of hydrolyzing histidylleucine was purified 50 fold from hog lung. The final preparation hydrolyzed $1.6{\mu}moles$ of histidylleucime per minute per mg of protein. The $K_m$ of the enzyme for the enzyme was found to be $2{\times}10^{-4}M$. The enzyme was required a number of free dipeptides for the substrate specificity, and was inhibited by EDTA and 1,10-phenan-throline. The molecular weight of the enzyme was estimated to be 80,000 daltons from sucrose density gradient sedimentation analysis. The corrected $s_{20,w}$ value was 5.3 S.
이기완 ( Ki-wan Lee ),박중근 ( Jung-geun Park ) 한국환경기술학회 2017 한국환경기술학회지 Vol.18 No.4
본 연구에서는 국내의 특정 하수처리장 슬러지의 연료화 관련 실험 및 자료 해석을 통하여 하수슬러지 개질방안을 모색하였다. 하수슬러지의 탄소함량 및 LHV값 등 일부 특성은 바이오매스의 연료화 GR 규격을 충족할 수 있으나 휘발분, 회분 및 발열량 문제의 개선을 위해 보강재가 필요함을 확인할 수 있었다. 하수슬러지 연료화 과정에서 저급탄 보강재와 당밀의 첨가는 연료의 탄소함량, 발열량, 기공율에 긍정적 개질효과를 발휘하며 저급탄 보강재와 당밀이 혼합된 하수슬러지 반탄화 개질연료의 LHV값은 4,280 kcal/kg ~ 5,520 kcal/kg 으로 나타나 원 하수슬러지에 비해 21% ~ 38%의 향상을 보여주었다. 하수슬러지의 반탄화 개질로 O/C비, H/C비가 현저히 감소하였고, 연소특성에서는 연료 휘발 및 연소의 온도영역 변화를 가져와 다단연소 방지에 따른 연소효율 개선이 기대되었다. This paper is to study on the reforming of sewage sludge through experiments and data interpretation on fueling of domestic sewage treatment plant sludges. Some characteristics, such as the carbon content and LHV value of the sewage sludge, can meet the biomass fuels GR specifications, but it was confirmed that reinforcement is needed to improve the volatile matter, ash and calorific value problems. The addition of low-grade coal and molasses in the sewage sludge fueling process has a positive effect on the carbon content, calorific value and porosity of the fuel, the LHV value of sewage sludge semi-carbonized reformed fuel mixed with low-grade coal and molasses was 4,280 kcal/kg ~ 5,520 kcal/kg, which was 21~38% higher than that of sewage sludge. The O/C ratio and the H/C ratio of the sewage sludge were significantly reduced due to the semi-carbonization of the sludge. In the combustion characteristics, the temperature range of the fuel volatilization and the combustion was varied.
Ti과 Ti합금의 SBF에서 Apatite 형성 관찰 및 부식거동 테스트
이승우,김윤종,최재우,박중근,김원수,김택남,Lee Seung-Woo,Kim Yun-Jong,Choi Je-Woo,Park Joong-Keun,Kim Won-Soo,Kim Taik-Nam 한국재료학회 2005 한국재료학회지 Vol.15 No.10
Ti and Ti alloys are known to have excellent corrosion properties, which is an important aspect for biocompability of these implants in human body. In our study, four types of samples (Cp-Ti, Ti-6Al-4V, $0.5wt.\%$ Fe-Ti and ECAP Ti) were tested for their apatite forming ability and corrosion properties. The micropolished samples were treated with 5M NaOH solution at $60^{\circ}C$ for 24 hours. Each samples was gently washed with distilled water and heat-treated at 600"C for 1 hour. The heat-treated samples were soaked in Simulated Body Fluid (SBF) solution at $36.5^{\circ}C$ in an incubator for different period of time. The test revealed that $0.5 wt.\%$ Fe-Ti showing faster apatite growth on the surface (7th day) compared to other samples. Polarization curve test (PCT) was also carried out to determine the corrosion resistance of each samples in SBF solution. ECAP-Ti showed highest corrosion resistance compared to any other samples. $0.5wt.\%Fe-Ti$ showed higher corrosion potential and corrosion current compared to other samples.