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건식용융환원 기술을 이용한 폐촉매로부터 Fe-Ni-Mo, Fe-V 합금 회수 기술의 전과정평가
이수선,김영실,안중우 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.3
The aim of this study is to evaluate the environmental impacts of recovery of valuable metals from the desulfurizing spent catalyst. Molybdenum, vanadium and nickel widely used in the area of catalysis. But the demand of these metals is full filled by industries. Every year, more than 18,000 tons spent catalysts are discarded. In most countries, spent catalyst is classified as a harmful waste. Thus, metal recovery from spent catalyst has been processed. The recovery process of molybdenum, vanadium and nickel from spent catalyst was mainly carried out wet process. However, this process are not suitable for economics and environmental aspects. Because environmental costs for removal of sulfur in the spent catalyst is high and huge amount of industrial wastewater occurs. Thus, it is necessary to develop a process which is efficient and does not cause pollution than the wet process. Thus, we have studied life cycle assessment about the dry process for the recovery of valuable metals.
액체 이산화탄소의 전과정목록(LCI) DB 구축에 관한 연구
이수선,김영실,안중우 한국청정기술학회 2015 청정기술 Vol.21 No.1
In this research, life cycle inventory database (LCI DB) was developed for liquid CO2 employing life cycleassessment (LCA) methodology. As are result of characterization and normalization process, production of liquid CO2 puts onenvironmental impact in the order of resource depletion, global warming, acidification, eutrophication and photochemicaloxidation, and among a wide variety of input, electricity contributes in most of the impact categories. Air emission plays a keyrole in the acidification and eutrophication while ammonia affects most on the ozone depletion. It is anticipated that developmentof liquid CO2 LCI DB makes it possible for national environmental strategies to be more activated including environmentallabeling scheme. 본 연구에서는 전과정평가 방법론을 활용하여 액체 이산화탄소 제조 공정에 대한 전과정목록 DB를 구축하였다. 특성화와정규화 결과, 액체 이산화탄소의 제조는 자원소모, 지구온난화 범주가 주로 영향을 미치며, 다음으로 산성화, 부영양화, 광화학적산화물생성 순이었다. 투입물의 기여도에서는 대부분의 영향범주에서 전력이 가장 높았으며 산성화와 부영양화에는 대기배출이 높은 기여도를 나타내었다. 오존층 파괴 범주의 경우 암모니아가 주된 원인이었다. 본 액체 이산화탄소 LCIDB를 통하여 탄소성적표지 등의 국가적 차원의 환경 전략 활용이 활성화되기를 기대한다.
기계적 합금화법으로 제조한 MgH_x-Graphene 복합재료의 수소화 거동 특성
이수선,이나리,김경일,홍태환 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.6
Mg hydride had high hydrogen capacity (7.6%), lightweight and low cost materials and it was promising hydrogen storage material at high temperature. However, commercial applications of the Mg hydride are currently hindered by its high absorption/desorption temperature, and very slow reaction kinetics. one of the approaches to improve the kinetic is MgH_x intermixed with carbon. And it shows that carbon and carbon allotropes have a beneficial effect on hydrogen sorption in Mg. The graphene is a kind of carbon allotropes which is easily desorbed reaction at low temperatures because its reaction is exothermic. In this work, the effect of graphene concentration on the kinetics of Mg hydrogen absorption reaction was investigated. The MgH_x-Graphene composites has been prepared by hydrogen induced mechanical alloy (HIMA). The synthesized powder was characterized by XRD and simultaneous TG, DSC analysis. The hydrogenation behaviors were evaluated by using a sievert’s type automatic PCT apparatus. In this research, results of kinetic profiles exhibit hydrogen absorption rate of MgH_x-5wt.% and 10wt.% graphene composite, as 1.25wt.%/ms,10.33wt.%/ms against 0.88wt.%/ms for MgH_x alone at 473K.
일본산 오징어 간을 이용한 은연어 가수분해물 제조의 최적화와 가수분해물의 특성
이수선(Su-Seon Lee),박주동(Joo-Dong Park),Kunihiko Konno,최영준(Yeung Joon Choi) 한국식품영양과학회 2013 한국식품영양과학회지 Vol.42 No.11
본 연구는 오징어 간에 분포하는 효소를 활용한 은연어 육가수분해물 제조의 최적 조건과 생성된 가수분해물의 식품 및 생물 활성 특성을 조사하였다. 가열 처리한 은연어 육가수분해물 제조의 최적 조건은 가수분해 온도 55°C, pH 5.5, 오징어 간의 첨가 비율 0.67%이었다. 총 구성 아미노산은 함량은 가열 및 산 처리 가수분해물에서 유의적인 차이를 보이지 않았으나, 총 유리 아미노산 함량은 조성은 산 처리 가수분해물이 높았다. 한편 무기질 함량은 가열 처리 가수분해물이 높았다. Cd의 허용 기준을 고려할 때 가수분해물 제조 시 전처리 공정은 가열이 적합한 것으로 나타났다. 가열 처리한 가수분해물의 분자량은 1,000~9,500 Da이 40.0%, 500 Da이 6.7%, 200~250 Da은 12.6%, 그 이외 분자량 물질이 34.8%인 반면, 산 처리 가수분해물은 450~5,600 Da이 40.9%, 200~300 Da이 16.8%, 그 이외의 분자량이 42.3%에 해당하였다. 가수분해물은 200 μg/mL의 농도에서 HepG2 세포에 대한 독성은 관측되지 않았다. 가수분해 물의 잠재적인 적용 분야를 확인하기 위해 식품 및 건강 기능성에 대한 연구를 진행하고 있는 중이다. In this study, the optimal conditions for salmon hydrolysate using squid liver and compositional properties of hydrolysate were investigated. The optimal conditions were 55°C, pH 5.5 and 0.66~0.67% (w/w) in the ratio of squid liver to acidic and thermal treated salmon muscle. The free amino acid of hydrolysate from the acidic treated salmon muscle was higher than that of hydrolysate from the thermal treated salmon muscle, while the total amino acid and mineral were high in the acidic treated salmon muscle. Furthermore, cadmium of hydrolysate from the thermal denatured salmon muscle was below 2 ppm, and has an acceptable level as potential ingredient. The distribution of peptide molecular weight was 40.0% for 1.0~9.5 kDa, 6.7% for 0.5 kDa, and 47.4% of others in hydrolysate from the thermal treated salmon muscle. Both hydrolysates did not show any toxicity against the HepG2 cell line for up to 200 μg/mL.