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½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞ ¹ ² ³ ⁴ ⁿ ₁ ₂ ₃ ₄
Æ Ð Ħ IJ Ł Ø Œ Þ Ŧ Ŋ æ đ ð ħ ı ij ĸ ŀ ł ø œ ß þ ŧ ŋ ʼn
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      저자 : 이행연 ( Haeng Ryun Lee ) (검색결과 2 건)
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        건식 및 습식공정으로 제조된 할로이사이트 나노튜브 입자 특성

        이행연 ( Haeng Ryun Lee ),김채호 ( Chae Ho Kim ),황규홍 ( Kyu Hong Hwang ),이종국 ( Jong Kook Lee ),박관식 ( Kwan Sik Park ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.1

        Natural halloysite kaolin contains many impurities, such as quartz phases, and varies in morphology and size during its formation in the earth. For it to be utilized as a new type of natural nano material, it is necessary to remove quartz impurities from the kaolin clays without affecting the morpholgy of its tubes. To remove quartz impurities from the kaolin by forming a well deflocculated aqueous slip without fracturing the morphology of the tubes, a slip of homogenized halloysite clay was recovered by adding polyvalent metallic cations and anionic polyelectrolyte flocculants simultaneously. This selectively flocculates the mixture of quartz and halloysite so that the halloysite particles form flows while the tubular halloysite remains in suspension. A dry separation process by grinding milling was adapted to compare the fine morphologies. Then a uniform size and tubular shape of the halloysite was obtained, and this could be used as a suitable container or a carrier to encapsulate nanomaterials.

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        효소활성재를 이용한 음식물류 폐기물처리 공정 특성

        이행연 ( Haeng Ryun Lee ),황규홍 ( Kyu Hong Hwang ),이종국 ( Jong Kook Lee ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.2

        To improve the extinction process of food waste enzymatic activity material derived from the selected microorganisms such as Bacillus were adapted and their functions to remove organic matters, bad smells and salts in food waste were studied. First of all the specific microscopic organism in soil such as radiation germ, yeast, and etc. were revitalized and set in sawdust so that the enzymatic activity came to appear. To identify the effect of processing of food waste treatment by enzymatic activity material, the amount of fermenter produced was checked and the reaction temperature, aeration periods, pH were measured. As a result, little change was occurred in pH, but approximately 20% change was shown in temperature and aeration periods. The decomposition of food waste by direct input of microorganism only should keep pH neutral mostly, and reaction temperature of as high as 60℃ was necessary for treating the food waste effectively. However, in case of using enzymatic activity materials, the decomposition of food waste achieved with a good condition even in pH 4~9, and as low temperature of 35℃. Especially, only 30% of injection of aeration can make decomposition efficiently so that the expenses of food waste handling would be reduced. To decrease the bad smell of food waste, mixing and stirring the food waste was adapted and hydrogen sulfide was decreased from 30 mg/L to 1 mg/L dramatically. As a result enzymatic activity material shows good ability to contribute the effective disposal and odor removing of food waste.

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