• Journal of the Korea Organic Resources Recycling Association
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• v.28 no.4
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• pp.15-22
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• 2020

The landfill gas produced in landfill is generally made up of methane(CH4) and carbon dioxide(CO2) of more than 90%, with the remainder made up of hydrogen sulfide(H2S). However, separate pre-treatment facilities are essential as hydrogen sulfide contained in landfill gas is combined with oxygen during the combustion process to generate sulfur oxides and acid rain combined with moisture in the atmosphere. Various desulfurization technologies have been used in Korea to desulfurize landfill gas. Although general desulfurization processes apply various physical and chemical methods, such as treatment of sediment generation according to the CaCO3 generation reaction and treatment through adsorbent, there is a problem of secondary wastes such as wastewater. As a way to solve this problem, a biological treatment process is used to generate and treat it with sludge-type sulfide (S°) using a biological treatment process.In this study, as a basic study of technology for utilizing the biological treatment by-products of hydrogen sulfide in landfill gas, an experiment was conducted to use the by-product as a mixture of concrete. According to the analysis of the mixture concrete strength of sulfur products, the mixture of sulfur by-products affects the strength of concrete and shows the highest strength value when mixing 10%.

• Journal of the Korean GEO-environmental Society
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• v.13 no.12
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• pp.59-66
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• 2012

In this study, it was sampling from heavy metal-contaminated soil with the waste in railroad workshop. And, the pollution concentration and analysis of particle-size distribution were conducted to design efficient purification process that it was aimed at high contaminated area, low contaminated area and samples containing waste foundry sand. But, it was the other signs of general soil contamination, as construction waste of waste concrete and waste wood, waste foundry sand, incinerator ash, etc is overall buried on the grounds. Thus, the common heavy metal purification technology has not decreased the pollution. However, heavy-metal contamination was reduced by magnetic separation utilizing the magnetic component of the mixed waste.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.2
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• pp.116-123
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• 2010

The current enforcement regulation of "The Act on the Promotion of Construction Waste Recycling" defines disposal method of combustible construction waste without obvious recyclging method of those. This leads most combustible construction waste to incinerate or landfill as mixed construction waste. Therefore, it needs regulations to decrease incineration or landfill and to increase recyling of combustible construction waste. This study analyzed the problems of disposal and management of domestic combustible construction waste. As well as considerated regulations relative to utilization of waste solid fuel. From these results, it suggested utilization plans of combustible construction waste as fuel.

• Journal of the Korea Organic Resources Recycling Association
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• v.15 no.1
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• pp.171-177
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• 2007

In order to investigate the effect of the methanogenic bacteria in bacteria in leachate on the degradability of landfill waste, this study has created 4 cylinder-shape PVC lysimeters (Diameter: 30cm, Height: 200cm, Volume: 140L) and for the biological treatment and recirculation of the leachate, two anaerobic batch reactors (Diameter: 20cm, Height: 30cm) were created. To simulate a conventional landfill, no recycling was done in L1. In L2, 1,068ml of leachate (twice of rainfall amount) was recycled. In L3 and L4, the leachate was anaerobically digested in a dark room (with $35{\pm}1^{\circ}C$) for a week and them recycled by 1,064ml and 2,128ml, respectively, with recycled water only. In terms of cumulative $CH_4$ production, however, L3 and L4 were much higher (three times) than L1 and L2. Between L3 and L4, the latter was 1.23 times higher than the former in terms of cumulative CH4 production. In other words, the more the methanogenic bacteria-activated leachate is recycled, the more active the degradation due to active methane fermentation by the recyled methanogenic bacteria. And methane recovery is different according to the amount of recycled the methanogenic bacteria in leachate.

• Journal of Korea Soil Environment Society
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• v.5 no.1
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• pp.75-83
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• 2000

Recently, many landfills are constructed by using geosynthetics with earth materials. Geotextiles in geosynthetics are applied for the various purposes such as filters of the leachate collection and removal system and protectors of geomembrane liner. However geotextiles can be exposed to direct sunlight during the construction of landfill for several months. As you know the exposure of polymers to sunlight can be a major source of degradation of them. This study is to suggest a criteria on the installation of heavy weight geotextiles at the landfill. For this purpose, several different geotextiles were evaluated by outdoor exposure at two different locations and under the different seasons for one and half years. As the results of outdoor exposure, polypropylene geotextiles with 500g/$m^2$ and 700g/$\textrm{m}^2$were maintained around 40% of the initial strength during for one and half years. However, the polypropylene geotextile of 1000g/$\textrm{m}^2$showed 65% of the retained strength for the same duration of exposure. The retained strength of all polypropylene geotextile reduced dramatically with the cumulative sunshine radiation on a horizontal surface of around 1500MJ/$\textrm{m}^2$.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.116-116
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• 2017

2012년 국내 총 폐기물(지정폐기물 제외) 발생량은 382,009 톤/일 으로 이 중 12.8%를 차지하는 생활폐기물 중 음식물 채소류폐기물 발생량은 13,209 톤/일 으로 대부분 소각 후 매립 처리되고 있다. 본 연구에서는 고수분 음식물 및 농업 폐기물을 재활용한 고형연료 제조에 필요한 열분해장치를 개발하고 실험을 통해 그 성능을 확인하고자 하였다. 본 연구를 위해 건조용량 50 kg/hr인 실험실용 열분해장치를 제작하였다. 건조 처리된 농업폐기물과 음식물 쓰레기를 열분해용 실험 원료로 사용하였다. 원료종류, 열분해 온도, 열분해 시간에 따른 농업폐기물과 음식물 쓰레기의 열분해 특성을 파악하였다. 농업부산물 건조물의 열분해 처리 결과, 열분해 처리능력은 평균 55.35 kg/hr, 저위발열량은 평균 3,333 kcal/kg으로 측정되었다. 농업부산물을 단순 건조 처리한 경우 고위발열량은 3,400 kcal/kg, 저위발열량은 3,090 kcal/kg으로 측정되어 열분해처리로 발열량이 향상됨을 알 수 있다. 음식물 쓰레기 건조물의 열분해 처리조건 및 결과, 열분해 처리능력은 평균 88.27 kg/hr, 저위발열량은 평균 4,016 kcal/kg으로 측정되었다. 음식물 쓰레기를 단순 건조 처리한 경우 고위발열량은 4,040 kcal/kg, 저위발열량은 3,686 kcal/kg으로 측정되어 열분해처리로 발열량이 향상됨을 알 수 있다. 열분해 처리능력은 연구목표치인 50 kg/hr보다 높게 나타났으며, 저위발열량은 연구목표치인 4,000 kcal/kg 보다 다소 높게 나타났다. 다만 저위발열량 측정 기준 함수율이 습량기준으로 약 10%로 추정되는 바 5%로 조절하고, 열분해 열풍온도를 $200^{\circ}C$ 까지 상승시키면 발열량이 훨씬 향상될 것으로 판단된다.

• Journal of Korea Soil Environment Society
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• v.4 no.1
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• pp.85-96
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• 1999

Biofiltration is an attractive technique for elimination of VOCs and odorous compounds from low-concentration, high-volume waste gas streams because of its simplicity and cost-effectiveness. The objective of this study was to estimate the removal characteristics of Odorous Compounds including $H_2$S, $NH_3$End BTEX in MSW landfill gases. This Study was conducted at Nanjido landfill site. A compost from the Nanjido composting facility was used as a filling material for biofiltration. Extracted landfill gases were injected into biofilter reactors after mixing with air. Experiments were performed in an incubator being set to $20^{\circ}C$ $H_2$S concentrations were monitored at the depths of 25, 50, 75 and 100cm from the bottom Of the biofilter reactors. 98% of $H_2$S was removed at the filling depth of only 25cm. NH$_3$removal rate was about 85%. Toluene removal rate was the highest among BTEX. Significant pH drop of a filling material was not observed during the biofilter operation of 1 month. Without mixing the landfill gas stream with all, the removal rate of $H_2$S decreased down to 30%.

• Journal of the Korean Geotechnical Society
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• v.24 no.7
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• pp.37-42
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• 2008

This paper estimates the long-term settlement of Incheon unsanitary solid waste landfill, which is 20 years old. The unsanitary solid waste landfill was subjected to pre-loading system over a period of 1 year, and 300 settlement monitoring provided the long term settlement data. This landfill contains relatively small amount of organic component, and therefore the initial stage of settlement was very small. The existing settlement models were examineed by comparing the observed behaviors of this site, and also they were used to predict the long-term settlement. Power Creep Law (PCL) model showed good agreement with the measured settlement obtained from the initial stage of the measurement, but other models showed satisfactory agreements after $50{\sim}70$ days of measurement.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.200-203
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• 2009

현재 발전차액 지원을 받고 있는 신재생에너지 전원은 태양광, 풍력, 수력, 매립가스, 바이오 가스, 연료전지 등 6개 전원이 있다. 신재생에너지 중에서 태양광, 조력, 연료전지, 풍력의 기준가격은 고정가격이며, 폐기물은 변동가격이고, 수력, 매립가스, 바이오가스, 바이오매스는 고정가격과 변동가격 중에서 선택할 수 있도록 되어 있다. 지난 2년간 신재생에너지 발전소 실적 이용률을 기준가격 적용 이용률과 비교해 보면 매립가스(20MW 미만), 바이오가스, 연료전지 이용률은 기준가격 적용 이용률 보다 낮게 나타났으며, 특히 바이오가스는 실적 이용률이 매우낮게 나타났다. 기타 신재생에너지 전원은 실적 이용률이 높게 나타났다. 발전차액(기반기금)은 기준가격에서 계통한계가격을 뺀 금액을 의미하며 고정가격, 변동가격의 요금선택에 따라 발전차액에 미치는 요소들이 달라진다. 고정가격을 선택한 경우는 계통한계가격, 이용률(전력 거래량)이 영향을 미치며 변동가격을 선택한 경우는 이용률만이 발전차액에 영향을 미친다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.15 no.1
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• pp.54-65
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• 2012

While fishery has been continuously suffering from deteriorating economic feasibility, the amount of the deposited marine litter has been increasing due to an increased number of marine leisure tourists which are caused by an improved quality of life and five-day work week. In addition, the fishery area has been reduced by the reclamation projects and it is being destroyed by marine pollution with a variety of contaminants coming from land and sea. To protect and improve fisheries in these poor conditions, Korean governments have implemented the submerged marine litter collection projects. However, previous research results on the marine environment and resources indicate that it requires a lot of time investment to achieve tangible results of such improvement. The 300 billion won marine environment and resource investigation project has been executed since July 2004 by Korean governments, which demands strategic approaches to obtain more effective and satisfactory results before the project expires in 2013. Ocean environment research institutes and governments need to cooperate each other to gain efficient and reasonable achievement by identifying and linking related projects. This study suggests that the marine environment and resources investigation projects should run parallel with the submerged marine litter collection projects on mutually agreed research items in the identical area of the ocean to obtain cost-effective improvement of marine environment and fishery conditions.