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활성화 및 zeolite/TiO2 코팅에 의한 하수슬러지 탄화 다공체의 표면처리 특성 비교
유영석 ( Yeong Seok Yoo ),김이태 ( I Tae Kim ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.6
Using sewage sludge in which the proportion of inorganic substance is low, the light weight aggregate having high mechanical strength could be manufactured by carbonization at high temperature and/or adding another inorganic substances in the feed. At the same time, the porous carbonized aggregate with light weightness and high strength had absorption/adsorption ability by well developed micro/meso pores. Additionally, trying to enhance the its surface capabilities, TiO2 as a photocatalyst and zeolite as adsorbent of inorganic substance was coated on the surface separately and simultaneously. The porous carbonated aggregate was composed of mesopores of 30 ~ 100Å in size with a pore volume of 0.047cm3/g. Moreover, activation of the porous carbonized aggregate showed 2 times larger specific surface area(70m2/g) than carbonization(35m2/g). Zeolite coating on the surface led to 3 times increase in iodine adsorption capacity. Zeolite/TiO2 coating showed larger adsorption ability to remove methylene blue and only zeolite coating showed relative larger heavy metals adsorption rate other than.
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유영석(Yeong Seok Yoo),김이태(I Tae Kim),지재성(Chai Sung Gee) 유기성자원학회 1995 유기물자원화 Vol.3 No.2
퇴비화 시설은 공기량과 수분 조절만으로 운전되기 때문에 2 개의 운전인자의 영향을 분석하기 위하여 수분을 첨가하는 경우와 첨가하지 않는 경우에 대하여 공기량을 변화시켜 모델링하였다. 또한 최적의 퇴비화 환경이 조성될지라도 발열량 및 분해속도에 따라 퇴비화 시설의 운전온도를 달리하여야하므로,고속분해 단계와 완속분해 단계의 운전온도를 변화시켜 모델링함으로써 퇴비화 공정에 대한 영향을 분석하였다. 한면 모텔은 미국 Roger T. Haug Inc 에서 개발한 “The Library of Compost Engineering Software" 를 사용하였다. 결과적으로 적정 함수율의 퇴비화 시설 운전이 공기량 변화에 대하여 운전온도의 변화가 민감하며, 수분이 부족한 경우에 비하여 오히려 적은 공기량으로 높은 반응율을 달성하게 된다. 완속분해 단계의 효과적인 운전이 전 공정의 분해율을 높일 수 있으므로 완속분해 물질의 분해에 춧점을 맞추어 단계별운전온도를 설정하여야 함을 알 수 있었다. Composting facilities are operated with air and moisture control. Composting effects on two operating factors was analysed changing aeration rate with and without water addition to maintain the optimun moisture level. Though the composting facilties are provided with appropriate surroundings for compositing, operating temperature is set for decomposition rate. Accordingly control of decomposition phases was analysed by modeling the process of high and low decomposition phases with various operating temperature. A composting model of ‘The Library of Compost Engineering Software" developed by Roger T. Haug Inc. in U.S.A. was applied in modeling. As result of this study, operation with optimum moisture has more sensitive temperature to aeration fluctuation and lead to higher reaction rate with lower aeration than operation with poor moisture. Decomposition rate in composting facilities depend on slow decomposition phase because high rate decomposing substances already have been decomposed before entire process is not completed. In order to enhance decomposition rate of organics, eHective decomposition in slow decomposition phase needs to be focused.
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김은서,이용희,심정연,유영석,Kim Eun-Seo,Lee Yong-Hee,Shim Jeong-Yun,Yoo Yeong-Seok 대한두경부종양학회 2000 대한두경부 종양학회지 Vol.16 No.2
Mucosal melanoma of the head and neck is a rare and usually lethal disease. Primary laryngeal malignant melanoma(LMM) are exceedingly rare tumors that morphologically are readily confused with more common types of laryngeal cancer. Treatment of choice for LMM is complete surgical excision and elective lymph node dissection is usually not recommended. The use of radiation or chemotherapy is generally thought to have no effect on local or distant disease and currently used as adjuvant therapy. The prognosis is extremely poor. We have experienced a 61 year old male patient with symptoms of foreign body and lump sense in throat. A dark pigmented polypoid mass was found on the right aryepiglottic folds with normal mobility of vocal cord. Total laryngectomy was performed under the diagnosis of malignant melanoma. Bone scan revealed multiple bony metastasis on ribs and lumbar vertebrae after 5 months of operation. There have been no evidence of recurrence at primary area. The patient died after 8 months of operation.
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서형석,나인욱,황경엽,신현철,김범석,유영석,So Hyungsuk,Nah In-Wook,Hwang Kyung-Yub,Shin Hyun Chul,Kim Beom-Suk,Yoo Yeong-Seok 한국지하수토양환경학회 2005 지하수토양환경 Vol.10 No.1
Potential for measuring mobile cadmium concentration in sandy soil using polymer magnetic beads with carboxyl groups was investigated. Experiments for extracting cadmium were performed with contaminated soils, de-ionized water and magnetic beads. In this neutral experimental condition, reacting cadmium with magnetic beads indicate total amount of cadmium that can be moved in soil. The results showed that the mobile fraction of cadmium in soil could be combined with magnetic beads in short time. After binding between cadmium and magnetic beads, the beads were separated from soil suspension by outer magnetic force. The bound cadmium was dissolved from magnetic beads by acid solutions, which were then analyzed by atomic absorption spectroscopy (AAS). This method can determine mobile heavy metals in sandy soil effectively than existing method which use pollutant chemicals to environments such as EDTA. 카르복실기가 결합된 고분자 자성체 (Magnetic beads)를 이용하여 토양에 함유되어 있는 유동성 카드뮴의 분석 가능성을 알아보았다. 추출실험은 채취된 오염토양을 통하여 행하여 졌는데, 추출실험재료로는 단지 토양시료, 증류수 그리고 고분자 자성체만이 사용되었다. pH가 중성인 이 조건에서 자성체는 토양에서 이동성이 있는 카드뮴만을 추출하게 되는데, 이런 토양의 유동성 카드뮴이 교반을 통하여 빠르게 고분자 자성체와 결합하는 것을 알아냈다. 그 후 자성체는 외부 자력으로 모아져 산으로 용해되고, 자성체에 결합되어 있던 카드뮴 다시 용출되어 Graphite furnace 원자흡광기 (AAS)로 분석되었다. 3가지 모래성토양의 추출실험결과를 보면 토양의 유동성 중금속 농도를 분석할 때 전형적으로 사용하는 EDTA (Ethylendiamintetraacetic acid)와 비교할 때, 고분자 자성체를 이용한 효율이 비슷하거나 더 높았음을 알 수 있었다. 이로서 모래성토양에서 유동성 중금속 농도를 분석할 때, 난분해성 물질인 EDTA등을 사용하지 않고 더 정확하고 간단히 유동성 카드뮴의 분석실험을 수행할 수 있음을 보여주었다.
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서형석(Hyungsuk So),신현철(Hyun Chul Shin),유영석(Yeong-Seok Yoo) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
It was evaluated whether magnetic beads able to add the functionality of environment purification can be employed in processing soil pollutants. In this study, the micro scale magnetic beads containing carboxyl groups were mixed with water and the soil (<0.025 ㎜) filtered through a sieve, and then it was agitated before isolating the magnetic substances by the use of outer magnetic force. The factors considered at this step were the ratio of soil to magnetic beads, ratio of soil to water, size of the tube where the reaction occur, and intensity of the magnetic force. From the separation experiment between soil and magnetic beads, it was concluded that the magnetic beads and water quantity have an impact on the degree of separation, yet the size of the tube and magnetic force does not have a considerable effect upon that in this small-scaled experiment. Through this experiment, the reaction conditions were optimized to achieve 90~100% of separation. Therefore, it was concluded that when the functionalized magnetic beads is introduced to environmental processing, it is able to be adopted to the soil processing as well as the water processing.
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