• 한국대기환경학회지
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• 제21권2호
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• pp.259-268
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• 2005

In this study, we investigated the seasonal variations in the composition and emission patterns of VOC ventilated as landfill gas (LFG) from an urban municipal landfill site during the winter (2002) and summer (2003) period. The results of our study, when examined using the major aromatic VOC components as BTEX, indicated the existence of diverse characteristics in the LFG emissions of VOC. It was found that the relative extent of benzene emission showed most significant increase in the summer season, while most species underwent notable reductions. Despite the presence of certain patterns in the seasonal emissions of BTEX, the gross picture of their emission between summer and winter was not different distinctively so that the wintertime emissions exceed their summer counterparts by about three times. The observations of moderate enhancement in wintertime LFG emissions of BTEX appeared to reflect such environmental changes in the winter season as favorable conditions for LFG ventilation with reduced surface emissions due to frozen soil layers.

• 한국재료학회지
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• 제14권2호
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• pp.157-162
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• 2004

The object of this research is to develop a carbon molecular sieve(below CMS) which can separate selectively to convert mixture gases spout at waste landfill into fuel. And this research is meaningful from the viewpoint of a quality improvement of CH$_4$ gas and an utilization of by-product. CMS was prepared using coconut shell powder as starting material and the effects of activators, temperature and modifier on the reaction were investigated in this research. Also, pore diameter, surface area of CMS and adsorption rate were measured and studied by cahn balance and ASAP2010. Its specific surface area and pore distribution were controlled easily at 800^{\circ}C and adsorption rate was very good. The CMS prepared in this research is shown to be able to separate landfill gases very effectively.

• 한국토양환경학회지
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• 제2권1호
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• pp.63-72
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• 1997

본 연구는 여러 종류의 매립지에서 발생가스를 측정하여, 다음과 같은 결론을 얻었다. (1) $CH_4$가스는 대부분 수직가스포집관에서 유출되며, $CO_2$가스는 총유출량의 약 50% 정도가 수직가스포집관을 통하여 유출된다. (2) 매립지 표면에서는 $CH_4$가스 보다 $CO_2$가스가 많이 유출된다. (3) 사면 복토층은 면적비율이 작으나 가스 발생량이 많으며, 특히 $CO_2$가스의 발생율이 높다. (4) 새로 반입된 쓰레기층 표면에서의 $CH_4$가스 발생량은 미소이므로 무시하여도 되나, $CO_2$ 가스 유출량이 많다. (5) 쓰레기층 노출, 복토층 다짐정도등에 따라 가스 발생량의 변화를 보인다. (6) 가스포집관과 복토 표면에서의 가스 유출량은 $CH_4$가스 유출이 많으나, 매립지 전체에서는 $CO_2$가스 유출량이 많다.

• 대한환경공학회지
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• 제39권9호
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• pp.534-541
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• 2017

바이오리액터형 매립지는 매립지 내부로 침출수나 폐수 같은 수분의 공급을 통하여 폐기물의 분해를 촉진하기 위하여 운영하며, 이러한 수분 공급은 매립가스를 증산하고 결국 매립지 조기안정화에 기여한다. 최근 바이오리액터형 매립지 운영을 위한 환경법이 제정되었으며 이에 따라 국내 최초로 수도권매립지에 도입하였다. 바이오리액터형 매립지의 안정적인 적용을 위하여는 매립지 내부의 수분분포 파악이 필수적이며 이를 통해 해당 구역에 적정하게 수분이 유지되도록 한다. 이를 위하여 매립지내부 수분분포 파악을 위하여 전기비저항탐사를 실시하였다. 본 연구에서는 수도권매립지 제2매립장 내에 침출수 재순환과 함께 장기간 전기비저항탐사를 수행하였다. 그 결과, 전기비저항값이 계절적 온도 변화에 큰 영향을 받고 있는 것을 확인할 수 있었다. 이에 따라 본 연구를 통해 조사된 온도와 전기비저항값의 상관관계를 통한 보정방법을 이용하여 바이오리액터형 매립지를 안정적으로 운영할 수 있도록 하였다.

• 신재생에너지
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• 제16권3호
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• pp.27-34
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• 2020

This study involved a total budget analysis on the greenhouse gas (GHGs) emissions of landfills, focusing on surface emissions and the effect on emissions reductions of generating landfill gas (LFG) electricity from March 7, 2007 to December 31, 2018. The GHGs reduction effect from the electricity generation using 536.6 × 10³ tCO₂ of CH₄ was only 5.8% of the GHGs from surface emissions of 9,191 × 10³ tCO₂. In the total budget, the collection ratio should be over 95% if the reduction effect is greater than the surface emissions. The correlation coefficient for the relationship between the LFG collection ratio and GHGs reduction was -0.89. An additional effect of lowering CH₄ content may occur if the surface emitting flux of LFG decreased with an increase in the collection ratio. The unit reduction effect of GHGs by suppressing surface emissions was 4174 tCO₂/TJ. This was far greater than that of LFG power generated (54.3 tCO₂/TJ), demonstrating that surface emission control is the most important measure by which to mitigate GHGs emission.

• 신재생에너지
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• 제5권2호
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• pp.15-24
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• 2009

As new small scale LFG (landfill gas) energy project model which can improve economic feasibility limited due to the economy of scale, LFG-Microturbine combined heat and power system with $CO_2$ fertilization into greenhouses was proposed and investigated including basic design process prior to the system installation at Gwang-ju metro sanitary landfill. The system features $CH_4$ enrichment for stable microturbine operation, reduction of compressor power consumption and low CO emission, and $CO_2$ supplement into greenhouse for enhancement plant growth. From many other researches, high $CO_2$ concentration was found to enhance $CO_2$ assimilation (also known as photosynthesis reaction) which converts $CO_2$ and $H_2O$ to sugar using light energy. For small scale landfills which produce LFG under $3\;m^3$/min, among currently available prime movers, microturbine is the most suitable power generation system and its low electric efficiency can be improved with heat recovery. Besides, since its exhaust gas contains very low level of harmful contaminants to plant growth such as NOx, CO and SOx, microturbine exhaust gas is a suitable and economically advantageous $CO_2$ source for $CO_2$ fertilization in greenhouse. The LFG-Microturbine combined heat and power generation system with $CO_2$ fertilization into greenhouse gas to enhance plant growth is technologically and economically feasible and improves economical feasibility compared to other small scale LFG energy project model.

• 대한환경공학회지
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• 제29권8호
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• pp.915-921
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• 2007

본 연구는 매립가스내 siloxanes 측정의 기초 연구로서 국내 매립지를 대상으로 하여 용매흡수법으로서의 최적 용매를 선정하고자 수행하였으며, n-hexane, acetone 및 methanol을 흡수용매로 하여 각 용매의 siloxanes 검출 특성을 비교 분석하였다. 연구결과 표준물질의 GC분석에서 사용된 3가지 흡수용매 중 methanol이 용매와 silane 피크의 겹침현상이 발생하지 않아 분리능이 가장 우수하게 나타났다. 검출되는 siloxanes 농도는 흡수용매에 따라 최대 2.6배의 농도차를 보였으며, 포집유속과 포집 임핀저 단수에 대한 의존성에 대해서도 높은 것으로 나타났다. Methanol은 siloxanes 총 농도가 가장 높을 뿐만 아니라 휘발성이 적어 임핀저 단별 흡수에서도 가장 이상적인 형태를 보여주었으며, 가장 낮은 상대표준편차를 나타내 실험대상 매립지에 가장 적합한 것으로 나타났다. 그러나 용매의 적합성은 매립지의 쓰레기 성상, 매립이력에 따라 다를 수 있다고 판단된다.

• 과학과기술
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• 제22권5호통권240호
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• pp.76-79
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• 1989

• 유기물자원화
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• 제23권4호
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• pp.40-51
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• 2015

본 연구에서는 국내 폐기물매립지에서 배출되는 온실가스를 저감하기 위한 호기성 안정화 기술의 적용 가능성을 평가하였다. 대상매립지는 국내 Y 매립지로 LandGEM 모델을 이용하여 메탄 배출량을 산정하였으며, 온실가스 저감량($CO_2eq$)은 혐기성 조건(베이스라인)과 호기성 조건에서의 배출량을 비교하여 산정하였다. 호기성 조건에서의 온실가스 저감은 폐기물매립지 내부로 공기를 주입 시 혐기성에서 호기성으로 전환되면서 부산물로 메탄대신 이산화탄소가 발생되기 때문이다. 평가결과 호기성 안정화 기술은 기존 혐기성 대비 86.6%의 온실가스를 감축하는 것으로 나타났으며, 이는 조기안정화를 통한 주변 환경오염 저감과 동시에 온실가스를 대폭 저감시킬 수 있는 것을 의미한다. 따라서 호기성 안정화 기술은 지속가능한 매립관점에서 보았을 때 국내 폐기물매립지에 적용할 수 있는 가장 적합한 기술 중 하나로 판단된다.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2002년도 춘계 국제 학술대회
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• pp.91-99
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• 2002

A recent survey investigated that there were over one thousand un-controlled closed landfills(1,072 sites) in Republic of Korea. Most of these landfills were constructed before 1986. Waste management act were not promulgated at that time, so they usually do not have dranage system and leachate treatment facility. Also, considerable attention has been received to landfill leachate pollution, leachate has an adverse impact on the surrounding environment such as soil, groundwater, and water supply source. According to the result of survey for closed landfill management, it was reported that 875 sites out of 1,072sites(81.6％) have no leachate treatment facility and 630 sites out of 1,072sites(58.7％) have been used for farm lands and residence. Consequently it is hard to do postclosure care continuously in most of cases and these uncontrolled landfills have contaminated farm lands and residence. The average age of these landfills are ranged mostly between 2 to 15 years. Much time and advanced technology are needed to remediate these uncontrolled landfills, therefore the survey for present status of closed landfill sites is required and suitable treatment processes should be prepared. With this point of view, We has been investigated to find out the present status of closed landfill, problems of post management and discussed plans for remediation and reuse. Remedial actions of un-controlled landfill have been carried out the many cities since 1997 upto now. Most frequently applied technology were reuse after excavation and there were several cases to capping in the surface of landfill and to construct subsurface barriers. It is considered that landfills in use have a possibility not to be controlled because of inadequate construction and improper management. Therefore remediation of uncontrolled landfills and recovery technology should be develop continuously Especially, it has been expected that resource technology of landfill gas as a energy has some advantages in controlling odors in the site area and accelerating stabilization of landfills with the energy.