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이승무,박원우,이수구,정인숙 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
This study was carried out to investigate the seawater and soil contaminations on the seashore near H-stream at I city. In order to do this, the collection of sampling was done at the several points, where are 4km, 500m, 100m and just down stream exit far from H-stream, with respect to their depths, respectively. And the analytical measurement was carried out to determine the degree of contaminations in terms of COD, BOD, pH, ignition loss, total phosphate, NH₃-N, heavy metals such as lead, cupper, cadmium, chromium(+6) and n-hexane extracts by the standard methods for the examination of water and wastewater. From the experimental results, the soil contaminations of seashore district near the exit of H-stream was most serious, followed the degree of seashore soil contamination at the area of 500m and 4km far from the exit of H-stream in order. Particularly, it is highly pointed that COD, total phosphate, NH₃-N and n-hexane extracts at seashore district near the exit of H-stream was measured respectively 6.55, 9.3, 5 and 2 times, compared with the degree of undersea soil contamination at the area of 4km far from the exit of H-stream thereby the nutriphication or oderly degradation be observed. Furthermore, the degree of seashore soil contamination in depth was also measured that the surface layer (5㎝) was highly contained such a contaminants, which was gradually decreased downward underground.
九宜埋立地에서 埋立쓰레기의 分解와 混合가스 發生에 관한 硏究
李承務,李秀求 동아대학교 환경문제연구소 1986 硏究報告 Vol.9 No.3
This investigation was carried out to study on the decomposition of refuses followed landfill gas generation from Kui landfill site at Seoul City, by analyzing LFG by boring test and chemical compositions of remaining refuses in the elapsed layer by open-cut, and measuring underground temperatures. From the experimental study, the following results were obtained; 1. About 66.3% of digestable organic substances in refuses have been gradually decomposed for 6 years after elapsed the landfill, where-by corresponding to 42% in the basis of amount of these organic matters at 1981, for last 1.5 years after the composition of landfill lapse in 1979. 2. The rate of refuse decomposition in the landfill site was very slow there-by generating LFG in the range of about 6 to 150ℓ/min with 56.6%(V/V) and 31.8%(V/V) in average of CH₄and CO₂ respectively. 3. The underground temperature profiles from the surface to 8m depth were almost distributed to 17℃ from 24℃, while leached by Han River water during rainy weather. 4. The chemical molecular formula was empirically derived, such as C₁₂H_(26)O_(9)N_(0.1)S_(0.02), by meaning the chemical compositions of carbon, hydrogen, nitrogen, oxygen, etc.
이온부선법에 의한 산업폐수 처리에 있어서의 동특성 연구
이승무,조영일,이수구,최종운 연세대학교 대학원 1981 延世論叢 Vol.18 No.1
This investigation was carried out to study the dynamic characteristics on the removal of Cu(II) from the wastewater by the ionic flotation technique, using sodium-dodecyl benzene sulfonate (DBS) as a foaming agent. The surface excess concentration of Cu(II) and DBS were measured with the change of DBS concentration in feed solution and superficial air velocity. In the simple model, the empirical equation for HTU was determined in terms of the air flow rate and concentration of DBS in feed solution as follows ; ***** Furthermore, the adsorption rate equation of Cu(II) was also experimentally obtained by measuring mean bubble residence time as follows; ***** = 2.86×102CF,DBS(1.4×10-7-7.69ΓCu) - 1.28ΓCu In the combined model with reflux, the removal ratio of Cu(II) and D.B.S. and enriching ratio were also studied.
김길주,이승무,이수구 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
This investigation was carried out to study the binding of waste sludge with cement binders. According to the change of moisture content of sludge and mixing ratio in the portland cement, special alumina cement and combination of portland cement and sodium silicate as the binder, the unconfined compressive strength and outflow of the toxic materials from the compressed sludge were measured and analyzed. In the condition of the same mixing ratio and moisture content, the unconfined compressive strength was decreased in the order of the use of special alumina cement, portlant cement + sodium silicate(10%), portlant cement + sodium silicate(5%), and portland Cement. To obtain the unconfined compressive strength above 10kg/㎠ in 70% moisture content and 7 days of curing time, the mixing ratio(C/S) must be above 0.2 and 0.3 for special alumina cement and combination of portland cement and sodium silicate(10%), respectively. In order to prevent the outflow of toxic materials from the compressed sludge, the mixing ratio and unconfined compressive strength must be over 0.5 and 6.5kg/㎠ for portland cement, 0.2 and 5.2kg/㎠ for special alumina cement, 0.25 and 4.1kg/㎠ for combination of portland cement and sodium silicate in 86% of moisture content, respectively.
기포부상 분리법을 이용한 Cr(Vl) 제거에 있어서의 단위조작적 해석과 동특성 연구
변동환,이승무,이수구 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.1
This investigation was carried out to study the removal of Cr(VI) from the wastewater by using cethyl ethyl dimethyl ammonium bromide (CEDA-Br) as a foaming agent in the ionic flotation process. To study the dynamic characteristics in this system, the bubble diameter and gas holdup were measured by the photographic and conventional methods and the surface excess concentrations of CEDA-Br and Cr(VI) were determined. Also the removal ratio was studied with changing the operating parameters. The adsorption rate equation of Cr(VI) was derived by using the ratio of surface excess concentrations of CEDA-Br and Cr(VI). And the dynamic equation on the liquid pool of bubble column was derived with mathematical assumptions from model building. The removal ration of Cr(VI) was proportional to the concentration of CEDA-Br in the feed solution and logarithmically to the air flow rate. In the double column system, the removal ratio of Cr(VI) could be increased to 92%.