• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1995년도 연약지반 안정처리 시공.관리 세미나
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• pp.88-116
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• 1995

The applicability of marine clay and banking material as landfill liner and supporting layer was examined, where additives (cement, lime, Mg0, bentonite and ESCA) were mixed with these soils. The mixtures were tested for the unconfined compressive strength, bending strength, permeability, and better results than existing solidifying agents were obtained. The freezing-thawing test is under way.

• 상하수도학회지
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• 제12권4호
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• pp.70-77
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• 1998

On this study, removal ability of nitrate was researched in the anaerobic zone arounding collection pipes in landfill. Stability state time of column was after 20 days and 20~90ml/day in flux. In this time, removal rate of phosphate was about 80%. Removal ability and average removal rate of CODCr is $36g/m^3{\cdot}d$, 25.3%, respectively. It was that reactor is able to remove more nitrate. Maximum nitrate removal ability was $4.83g/m^3{\cdot}d$.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 지반환경 및 준설매립에관한 학술세미나
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• pp.42-71
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• 2001

Leakage detection system can possibly locate leak point without laboratory analysis. Several different types of sensors provide these benefits. But the use of these technologies is not widespread, mainly because of cost. Each of the leakage detection systems available has different advantages and disadvantages. The ideal system would be affordable, durable enough to last through the life of the landfill, automated, and applicable to all types of landfills. The laboratory tests were performed to investigate the relationship between electrical resistivity and the unsaturated subsurface condition and to evaluate the contamination due to leachate based on measuring electrical resistivity. The results of experiment show that the electrical resistivity of soil decreases as moisture density increases. The electrical resistivity of soil decreases as the concentration of leachate in pore fluid increases. These facts indicate that electrical resistivity method can be a promising tool in detecting of leachate. Also, the field model tests were conducted to verify that detection of leachate leak point on detection system using electrical characteristics is accurate. Field model test results of leakage detection system imply that the leakage detection system using electrical characteristics have the great potential of detecting exactly the leak point of leachate.

• 한국환경과학회지
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• 제5권4호
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• pp.495-511
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• 1996

The quantitative study of the groundwater contamination in a porous media is a difficult task. For complex problems, numerical solutions are the most effective means to study the movement of contaminants in the groundwater, The solute transport model used in this study has proved to be an efficient tool to model contaminant transport for complex problems. The model demonstrates its effectiveness in reproducing the coniamination by ihlorides of the groundwater at the landfill site due to leachath from the wastes. It describes the two dimentional solute transport and alteration of the water quality and forecasts the contamination for different management alternatives of the landfill. The model also indicates how the groundwater contamination can be contained within the lower site if a barrier is constructed downstream of the disposed wastes.

• 환경위생공학
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• 제16권1호
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• pp.47-52
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• 2001

In this study, we focused on typically problematic sulfide compounds Gas samples were captured at Unjung-ding landfill site in Metropolitan Kwangju with flux chamber and floating chamber, and analyzed for the amount of hydrogen sulfide($H_2S$), dimethyl sulfide $((CH_3)_2S)$ and dimethyl disulfide$((CH_3)_2S_2)$. From the gas pipe, landfill surface and leachate treatment plant, estimated total amount of $H_2S$ emission are 12.6ton/yr, 0.01ton/yr and 1.04ton/yr; estimated total amount of $((CH_3)_2S)$ 30.7ton/yr, 0.08ton/yr and 1.72ton/yr; and estimated total amount of ($((CH_3)_2S_2)$ 2.2tom/yr, 0.02ton/yr and 1.03ton/yr, respectively. Further in-depth study on co-relation between age, packing characteristics, temperature and humidity of landfill site and gas emission characteristics is needed.

• 한국환경과학회지
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• 제8권3호
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• pp.325-330
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• 1999

This study aims to observe the inhibition of methane generation, the decomposition of organic matter, and the trend of outflowing leachate, using the simulated column of the anaerobic sanitary landfill structure of sulfate addition type which is made by adding sulfate to a current anaerobic landfill structure, and the simulated column of semi-aerobic landfill structure in the laboratory which is used in the country like Japan in order to inhibit methane from a landfill site among the gases caused by a global warming these days, and at the same time to promote the decomposition of organic matter, the index of stabilization of landfill site. As a result of this study, it is thought that the ORP(Oxidation Reduction Potential) of the column of semi-aerobic landfill structure gradually represents a weak aerobic condition as time goes by, and that the inside of landfill site is likely to by in progress into anaerobic condition, unless air effectively comes into a semi-aerobic landfill structure in reality as time goes by. In addition, it can be seen that the decomposition of organic matter is promoted according to sulfate reduction in case of $R_1$, a sulfate-added anaerobic sanitary landfill structure, and that the stable decomposition of organic matter in $R_1$ makes a faster progess than $R_2$. Moreover it can be estimated that $R_1$, a sulfate-added anaerobic sanitary landfill structure has an inhibition efficiency of 55% or so, compared with $R_2$, a semi-aerobic landfill structure, in the efficiency of inhibiting methane.

• 공업화학
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• 제18권6호
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• pp.612-617
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• 2007

본 연구는 음식물류폐기물의 직매립 금지가 매립지가스, 악취 및 침출수 발생에 미치는 영향을 평가하고 현행 제도의 타당성을 평가하기 위하여 실시하였다. 음식물류폐기물을 각각 약 45% (Exp.45)와 약 15% (Exp.15)를 충전한 2개의 매립모형조를 비교하였다. 570일 동안 매립지가스 발생량은 Exp.45가 1400 L로 Exp.15의 906 L보다 많았다. 매립가스 조성은 두 반응기 모두 메탄과 이산화탄소가 1 : 1 정도로 발생되어 큰 차이는 없었다. 황화수소는 Exp.15와 Exp.45에서 각각 2~7 ppmv과 2~30 ppmv가 발생하였다. 침출수량에는 큰 차이가 없었으나 $BOD_5$가 Exp.45는 37000 mg/L, Exp.15는 25630 mg/L를 나타내었고 $COD_{Cr}$도 각각 45480 mg/L와 30294 mg/L를 나타내었다. TOC의 농도도 운전기간 동안 Exp.45가 Exp.15보다 2~3배 정도 높았다. 음식물류폐기물 함량이 높은 폐기물 매립은 가스발생량을 증가시켰지만 악취발생 및 침출수 수질 악화 등 환경적 악영향을 더 많이 유발하였기 때문에 현행 음식물류폐기물의 분리배출 및 직매립 금지조치는 적절한 것으로 평가되었다.

• 한국환경과학회지
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• 제31권8호
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• pp.677-689
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• 2022

In order to photocatalytically treat organic matter (COD_Cr) and chromaticity effectively, chemical coagulation and sedimentation processes were employed as a pretreatment of the leachate produced from landfill in Jeju Island. This was performed using FeCl₃·6H₂O as a coagulant. For the treated leachate, UV/TiO₂ and UV/TiO₂/H₂O₂ systems were investigated, using 4 types of UV lamps, including an ozone lamp (24 W), TiO₂ as a photocatalyst, and/or H₂O₂ as an initiator or inhibitor for photocatalytic degradation. In the chemical coagulation and sedimentation process using FeCl₃·6H₂O, optimum removal was achieved with an initial pH of 6, and a coagulant dosage of 2.0 g/L, culminating in the removal of 40% COD_Cr and 81% chromaticity. For the UV/TiO₂ system utilizing an ozone lamp and 3 g/L of TiO₂, the optimum condition was obtained at pH 5. However, the treated COD_Cr and chromaticity did not meet the emission standards (COD_Cr: 400 mg/L, chromaticity: 200 degrees) in a clean area. However, for a UV/TiO₂/H₂O₂ system using 1.54 g/L of H₂O₂ in addition to the above optimum UV/TiO₂ system, the results were 395 mg/L and 160 degrees, respectively, which were within the emission standard limits. The effect of the UV lamp on the removal of COD_Cr, and chromaticity of the leachate decreased in the order of ozone (24 W) lamp > 254 nm (24 W) lamp > ozone (14 W) lamp > 254 nm (14 W) lamp. Only COD_Cr and chromaticity treated with the ozone (24 W) lamp met the emission standards.

• 한국해양학회지:바다
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• 제4권4호
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• pp.298-304
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• 1999

본 연구는 황복 Takifugu obscurus의 자치어를 이용하여 쓰레기 매립지 침출수의 독성도를 생물검정을 통해 평가하고, 침출수 해양방류가 수산생물에 미치는 영향 및 피해 등을 추론하는데 기본적인 자료로 제공하고자 수행되었다. 급성독성 단기실험은 인공수정에 의해 부화된 자치어(전장 5, 10, 15 mm)와 자연산 치어(전장 30, 45 mm)를 대상으로 실시되었다. 1996년 9월에 채수한 침출수의 부피비 0%~16%범위로 실험구를 설정한 후 실험을 실시하였고, 결과로 Spearman-karber Method를 이용한 반치사농도($LC_{50}$)를 구하였다. 전장별 5단계의 24hr-$LC_{50}$은 침출수 농도 3.03~8.57%, 48hr-$LC_{50}$은 2.73~6.21%, 72hr-$LC_{50}$은 2.45~5.53%, 96hr-$LC_{50}$은 2.38~4.93%로 나타났다. 또한, 96hr-$LC_1$은 0.69~1.51%로 나타났다. 행동 관찰 결과, 호흡수에 있어서는 침출수 농도 0.5%와 1%사이에서 영향이 나타났다(P < 0.05). 전장 5 mm의 자어 단계가 가장 높은 $LC_{50}$을 보였으며, 전장 약 15 mm까지는 감소의 경향을 보이다 15 mm이상에서부터 성장에 따라 $LC_{50}$이 증가하였다. 시간의 변화에 따라 $LC_{50}$은 감소하였으며, 감소양상은 성장에 따라 다르게 나타났다. 이상의 결과로부터, 황복의 자치어에 있어서 침출수 농도 3%이상에서 24시간 내에, 2%이상에서는 96시간 내에 50%의 사망률을 보여 치사의 영향이 나타나고, 침출수 농도 0.5%와 1%사이에서 어체에 생리적인 영향을 미치는 것으로 사료된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제12권3호
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• pp.75-80
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• 2007

본 연구에서는 W시에 있는 비위생매립지 주변의 지하수질 약 2년간 관측하고 그 결과를 평가하였다. 주요관심 인자는 산화환원조건에 민감한 pH, 용존산소, 전기전도도, 산화환원전위, 용존 유기탄소, 암모니아, 질산성질소 및 황산이온 등이다. 본 매립지는 생활쓰레기 매립지로 매립종료 약 10년이 경과하였다. 매립지 침출수는 COD 136${\sim}$263 mg/L, T-N 121${\sim}$186 mg/L, NH3-N 14${\sim}$369 mg/L이며, 계절적 변동이 크게 나타났다. 매립지 직하부 지하수는 약산성을 띄나 전기전도도가 매우 높아 침출수 누출의 영향을 나타내었다. 염소이온의 경우 200 mg/L 이상으로 높으나 거리가 멀어짐에 따라 점차 감소하였는데 확산 및 희석 등의 자연저감효과가 큰 것으로 사료된다. 매립지 내부에서는 산화 환원전위가 음의 값을 보이나 하부에서는 350 mV까지 증가하여 혐기성환경에서 산화환경으로의 전이를 나타내었다. 암모니아는 가장 우려되는 지하수질 인자인데 대부분의 관측정에서 크게 부화되어 있으며, 먹는물 수질기준을 상회하였다. 본 매립지 하부의 오염지하수질은 시공간적으로 자연저감 현상이 뚜렷하나 지속적인 수질모니터링이 필요한 것으로 판단된다.