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金燦國,金五植 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
Size of composted Soil-filter was 1.6m×2.5m×7.3m. Constituents of filter media were made of domestic loam 80%, compost 10%, and hen feces 10%, and Packed materials of the filter were gravels of 40∼100㎜ diameter and sands of 0.15∼1.0㎜ diameter in this deodoring experiment. By utilizing the above composted soil-filter, we investigater the deodoring of night-soil. The results from this study were obtained as follows 1) Equilibrium water content of filter media was nearly 30 percent. 2) Deodoring efficiencies of gases NH₃, H₂S, CH₃SH, and(CH₃)₂S were 91.3%, 67.5%, 77.4%, and 44.0% respectively. 3) At the upper side of Soil-filter, No-odor appeared when the odorous gas was diluted 325 times in panel test at the bottom side of soil-filter.
金燦國,李成植,張哲鉉 동아대학교 환경문제연구소 1981 硏究報告 Vol.5 No.1
The dynamic characteristics of the adsorption of COD on domestic activated carbon were studied by using a shallow bed in column. The effects of linear velocity(0.5∼3m/hr) of flowing solution through the bed, particle size(20∼60 mesh) and kind of activated carbon on K_(La) were studied. The results obtained were as follows. 1. The linear velocity does not exert an influence on K_(La) in the range of 0.5∼3m/hr, therefore, it was found that the intraparticle pore diffusion resistance is the rate controlling. 2. When sieved activated carbon from wood was used, the correlation between mean particle size of activated carbon, d ̄, and K_(La) ̄ was obtained as follows: K_(La)-30(d ̄)^(-1.2)(1/hr). 3. The adsorption isotherm of COD on domestic activated carbon was well fitted Freundlich's Model.
金燦國,姜大雨 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.1
Domestic coal mines are being encountered with deepening operation, which results in difficulty and cost run due to increasing earth-pressure and geotherm as well as problem of haulage, ventilation and drainage. Under this circumstance, it is without doubt that the technical improvement in mining method is seriously required. This study, therefore, was undertaken in connection with the mechanization of coal mine, especially where possibility of method in coal face. It was found that new mechanized mining method which have been tested in Young-Bo mine is expected to be adopted to domestic mines. The results of new mining method are summarized below. 1. The ratio of yield and O.M.S. increased. 2. The coal layer is possible under 0.3 meter. 3. The ratio of calamity decreased.
김찬국 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
The molybdenum blue method is widely used for phosphorus determination in a great variety of substrates, but this method has many restrictions in conditioning and too sensitive to the interfering ions in the solution. The present study used cation exchange resin IR-120, and stannous chloride as a reducing agent to improve the accuracy and rapidity of the analysis. The optimum concentration of sulfuric acid was 1.50-0.75N, and that of ammonium molybdate was 0.14-0.16%. The influence of concentration of the reducing agent, addition of resin for removing the ferric ion, and shaking time of the sample solution on the analytical results are discussed in this paper. By this method, the interference of ferric ion in the sample solution was removed very easily and satisfactory rusult was obtained. In order to test the reproducibility of this method, analyses of the Japan G. S standard sample JB-1, JG-1 and various kinds of rock and silicate mineral samples were carried out repeatedly. The results obtained were satisfactory for practical purposes.
金燦國,薛秀德 동아대학교 공과대학 부설 한국자원개발연구소 1979 硏究報告 Vol.4 No.1
Ba(CH)₂·8H₂O, (NH₄)₂HPO₄ 및 MnO₂간의 混合比를 任意로 變化시킨 試料를 電氣爐에 넣고 하燒溫度를 變化시켜 Ba₃(PO₄)₂를 製造하는 實驗이다. 混合比 3:1:2:1.2의 試料를 800℃에서 3時間 가량 하燒시켜 본 結果, 90% 以上의 收得率을 가진 靑綠色의 α-Ba₃(PO₄)₂가 生成되었다. A study on the formation of Ba₃(PO₄)₂ was carried in different sample that change mole ratio of Ba(OH)₂·8H₂O, (N₄)₂HPO₄, MnO₂ and changed their calcined temperature in an electric muffle furnace. When sample thus mixed mole ratio 3.1.2.1.2 was calcined at a temperature range 800℃ for 3 hours, 90% and over calcined material was recovered in the form of α-Ba₃(PO₄)₂ with a greenish blue colour.