• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.180-183
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• 2003

Recently, the pollution of soil and groundwater becomes a serious social problem, and geophysical exploration methods have been introduced as a remedial investigation method of subsurface. Digital technologies such as personal computer have revolutionized our ability to acquire large volumes of data in a short term, and to produce more reliable results for subsurface image. Also, color graphics easily visualizes the survey results in a more understandable manner, and it is widely used for not only characterizing the contaminated subsurface but also monitoring contaminant and remedial process. In this paper, electrical resistivity survey were carried out In order to understand characteristics of waste landfills, and the applicability of geophysical prospecting to site assessment of waste landfill was also tested. According to the result, electrical resistivity survey were effective in estimating distribution of the leachate plume.

• 대한지하수환경학회지
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• 제4권4호
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• pp.185-190
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• 1997

부산 석대 폐기물 매립지에서 1996년 7월중 전기비저항탐사를 실시하였다. 매립지 내부에서는 쌍극자탐사 4측선과 슐럼버져 수직탐사 7측점이 수행되었으며, 매립지 전방지역에서는 수직탐사 2측점이 수행되었다. 자료의 해석결과, 매립지 내부에서는 l0Ωm이하의 낮은 비저항값을 가지는 층이 지표하 50m 까지 나타났으며, D 블록의 경우는 다른 블록들보다 이러한 저비저항대가 약 2~10 m 정도 두껍게 나타났다. 이 지역의 기반암 심도와 매립고를 고려할 때, 매립지 내부에서는 침출수에 의한 기암의 오염은 진행되지 않았으나 풍화대는 오염된 것으로 판단된다. 그러나 A, B 블록에서 N$70^{\circ}$W의 주향을 가지는 소규모의 단층이 쌍극자탐사자료에 확인되어, 추후 기반암의 침출수오염 가능성을 배제할 수 없다. 또한 다른 블록들에 비하여 D 블록의 지충오염 정도가 가장 심한 것으로 나타났는데 이는 침출수의 주 유동방향이 D 블록을 향하고 있기 때문인 것으로 생각된다. 한편, 매립지 전방지역에서는 비저항자료에 의한 지층의 침출수오염 징후는 발견되지 않았다.

• 한국지반환경공학회 논문집
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• 제19권10호
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• pp.27-34
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• 2018

원호활동파괴가 발생한 해안 폐기물 매립장에서 기초지반 전단강도의 보완과 폐기물 침출수가 지하수나 인접지반으로 유동되는 것을 차단하는 최종 시설로서 시멘트계 지중벽체를 시공한 후, 침출수 차단효과를 확인하였다. (1) 육안 확인 및 (2) 압축강도 시험에 의하면 지중에 시공된 벽체의 품질이 상당히 양호하다는 사실을 확인할 수 있고 (3) 현장 투수시험과 (4) 성분 및 성분비 분석과 (5) 질량 분석기를 통해서 얻게 되는 크로마토그램의 분포패턴 판정 등 중복적인 실험 및 조사 분석에 의해서 벽체의 수밀성이나 침출수의 이동에 대한 차단성이 매우 크다는 것을 확인할 수 있었다. 따라서, 폐기물 매립장 내에서 발생하는 침출수와 같은 고농도 환경오염수가 매립장 밖으로 유출되거나 침투하는 것에 대한 신뢰적인 차단 여부는 이 5가지의 조사 및 시험을 실시하는 방안에 의하여 객관적으로 판단될 수 있다고 사료된다.

• 대한토목학회논문집
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• 제30권1C호
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• pp.7-15
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• 2010

폐기물 매립지에서 손상된 지오멤브레인 라이너에 의해 지층으로 오염물질의 침투가 유발된 경우, 환경적인 피해를 최소화 하기 위해서는 전기영동기법에 의한 지오멤브레인 라이너의 즉각적인 복구가 필요하다. 하지만 실제 매립장 침출수내에서 전기영동기법 적용시 침출수내 다양한 화학종과 점토입자와의 상호작용으로 인해 점토 입자들의 응집이 촉진되고, 전기영동적 이동보다 중력에 의한 침강거동이 우세하게 나타나며, 결국 실제 매립지 현장에 대한 전기영동기법의 적용상 한계점이 유발되었다. 이에 따라 본 연구에서는 점토입자의 응집을 최대한 방지시켜 전기영동력에 의한 입자의 개별적 이동이 유발될 수 있도록 전기영동 향상기법에 대한 1차원 실내실험을 수행하였다. 그 결과, PAA를 사용할 경우, 점토 끝단에 흡착된 폴리머의 전기적 척력효과로 인해 점토 입자의 분산화 효과가 증대되었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제29권4호
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• pp.1-11
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• 2024

This study evaluated a method for prompt and periodic monitoring of moisture content in the waste layer of a landfill using a Time Domain Reflectometry (TDR) sensor, aimed at ensuring the stable operation of the bioreactor facility at the 2nd landfill of the SUDOKWON Landfill Site. It was found that the TDR sensor is sensitive to variables such as temperature changes and ion content in both the waste layer and leachate, indicating that a correction equation is necessary. A correction equation derived through regression analysis demonstrated a high correlation (correlation coefficient = 0.9647), and field verification experiments confirmed its reliability with an average deviation of only 1.5%. This verifies that the TDR sensor is effective for measuring and monitoring moisture content in landfills. It is also anticipated to be useful for various applications, including monitoring leachate levels, detecting leachate leakage, and assessing rainwater infiltration.

• 환경위생공학
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• 제11권1호
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• pp.45-55
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• 1996

An experimental research was conducted in order to study the combined treatment o of municipal landfill leachate and municipal sewage. The landfill leachate was that of Nanjido landfill site, and the municipal sewage was that of Chungnang municipal sewage treatment plant in Seoul. Several sets of bench~scale sequencing batch reactor(SBR) were used as e experimental apparatus. Specially investigated items in this experiment were the removal efficiency of substrate and the influence of treatment time. The experiment lasted for about 2 years. The result are as follows ; 1. The characteristics of leachate were pH 7.5~8.2, BOD 80~336mg/L, COD 908~1,460mg/L, NH3-N 1,409~2,330mg/L, T~P 2.7~7.lmg/L, Cl~3,540~4,085mg/L, a and heavy metals are a very small amount. And the characteristics of sewage were pH 6.9~7.3, BOD 78.4~129.3mg/L, COD 121.2~305.0mg/L, T~N 14.9~36.4mg/L, T-P 2.3~8.9mg/L. 2. The treatability of leachate alone was not treat well. So for the good treatment of leachate, it was necessary to deal with the pretreatment before bi이ogical treatment and a combined treatment of municipal sewage. 3. The various contents of the leachate were 5%, 10%, 30%, and 50%, and the removal efficiency of COD was 86.0%, 82.8%, 60.6%, and 31.7%. The maximum content of the leachate which could be sucessfully treated by SBR in the combined treatment was 10% of that of sewage. And the removal efficiency of COD increased n notably, as its treatment time increased. 4. The various contents of the electrolytic treated leachate were 5%, 10%, 30%, and 50%, and the removal efficiency of COD was 89.9%, 86.1%, 79.2%, and 69.8%. The maximum content of the leachate which could be sucessfully treated by SBR in the combined treatment was 30 % of that of sewage. And the removal efficiency of C COD increased notably, as its treatment time increased.

• Advances in environmental research
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• 제10권1호
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• pp.59-86
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• 2021

Landfilling is the most commonly adopted method for a large quantity of waste disposal. But, the main concern related to landfills is the generation of leachate. The leachate is high strength wastewater that is usually characterized by the presence of high molecular recalcitrant organics. Several conventional methods are adopted for leachate treatment. However, these methods are only suitable for young leachate, having high biodegradability and low toxicity levels. The mature and stabilized leachate needs advanced technologies for its effective treatment. Advanced oxidation processes (AOPs) are very suitable for such complex wastewater treatment as reported in the literature. After going through the literature survey, it can be concluded that Fenton-based approaches are effective for the treatment of various high/low strength wastewaters treatment. The applications of the Fenton-based approaches are widely adopted and well recognized due to their simplicity, cost-effectiveness, and reliability for the reduction of high chemical oxygen demand (COD) as reported in several studies. Besides, the process is relatively economical due to fewer chemical, non-sophisticated instruments, and low energy requirements. In this review, the conventional and advanced Fenton's approaches are explained with their detailed reaction mechanisms and applications for landfill leachate treatment. The effect of influencing factors like pH, the dosage of chemicals, nature of reaction matrix, and reagent ratio on the treatment efficiencies are also emphasized. Furthermore, the discussion regarding the reduction of chemical oxygen demand (COD) and color, increase in biodegradability, removal of humic acids from leachate, combined processes, and the pre/post-treatment options are highlighted. The scope of future studies is summarized to attain sustainable solutions for restrictions associated with these methods for effective leachate treatment.

• 한국지반신소재학회논문집
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• 제7권1호
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• pp.31-37
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• 2008

매립지 건설 시 발생하는 침하는 폐기물매립장의 배수시스템의 손상을 일으킨다. 그리고 막힘 현상은 침출수 집배수시스템의 수리전도도를 감소시켜 매립지 내 침출수 수위 상승을 가져온다. 결과적으로 침출수 차단기능을 감소시킬 것이다. 본 연구의 주목적은 침출수 집수 및 배수시스템에서 배수층의 손상을 최소화하기 위하여 부직포와 지오그리드를 결합하여 새롭게 디자인 된 지오텍스타일 (보강형배수재 : RDG)의 현장 적용성 평가를 위한 것이다. 따라서 본 연구는 보강형배수재의 수직투수성 변화를 관찰하고 침출수 집배수시스템에서 보강형배수재를 사용해서 배수능력을 평가하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 봄 학술발표회 논문집
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• pp.607-614
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• 2000

Settlement with crack on the hardened liners may occur in the weak clay due to waste load since the stiffness of the hardened liner is greater than that of the clay layers. Way of reducing deformation crack in the hardened liner is investigated using two computer programs, CONSOL and FLAC. The computer program CONSOL estimates the magnitude of settlement with time in clay layers and FLAC analyses the stress and deformation relationship between the foundation of landfill and waste load. The results show that a representative block of the analyzed area reaches the consolidation settlement of 1.32m, 8.8 years after the disposal of waste started with the degree of consolidation U=90%. The stress within the hardened liner exceeds the allowable vertical stress of 5kg/$\textrm{cm}^2$ and horizontal stress of 1.67kg/$\textrm{cm}^2$ at the concave part of the liner where the main and branch drainage pipes of leachate are located. It was recognized that the thickness of the interested area should be enlarged or the strength of the same area should be improved to tolerate the planned waste load.

• 상하수도학회지
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• 제31권4호
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• pp.357-362
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• 2017

Acetate, propionate, butyrate are the major soluble volatile fatty acids metabolites of fermented food waste leachates. This work investigate the effects of volatile fatty acid on the growth rate and $NH_4-N$, $PO_4-P$ removal efficiency of mixotrophic microalgae Chlorella vulgaris to treat digested food waste leachates. The results showed that acetate, propionate and butyrate were efficiently utilized by Chlorella vulgaris and microalgae growth was higher than control condition. Similar trends were observed upon $NH_4-N$ and $PO_4-P$ consumption. Volatile fatty acids promoted Chlorella vulgaris growth, and nutrient removal efficiencies were highest when acetate was used, and butyrate and propionate showed second and third. From this work it could be said that using mixotrophic microalgae, in this work Chlorella vulgaris, fermented food waste leachates can be treated with high efficiencies.