• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.699-704
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• 2001

Until recently, disposal to landfill has been the most convenient way to deal with the increasing amount of residues the shredding industries produce. But the shortage of such disposal sites and the risk that liquid drained from these waste dusts may pollute ground water have increased the environmental pressures to find more effective solutions. The present study is an alternative approach that suggests identifying waste dusts characteristics and selecting an appropriate binder for hazardous materials to reduce the amount of contaminants (mainly lead) that were leaking into the soil. Investigations on the characteristics of automobiles waste dusts show that these materials are composed mainly of cottons and sponge like substances, plastics, rubber, glasses and gravel, metals, and electric wires. Besides, the percentage in weight of organic (inflammable) materials is about 70% and the lead contamination, which has not a ionic but a particulate nature, is particularly remarkable in cottons and sponge like materials. Binding additives such as K-20 and sodium carbonate were not effective but the addition of 5 % of cement (in weight of the investigated sample) followed by a 3-minute stirring and a 4-hour storage could drastically reduce the run off of lead below the maximum authorized level. No addition of water was necessary in this method.

• 환경영향평가
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• 제4권1호
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• pp.9-15
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• 1995

For the purpose of saving the waste disposal cost a self-governing community on the whole reclamates the wetland and uses it as a landfill site. During the operation period of site, the environmental impact by the leachate is usually neglected. Therefore, to predict the environmental impact and dispersion of leachate, the wetland adjacent to the South Han River in Chungju is selected as a site of case study. The main content of this article is to apply the simulation model CONMIG to leachate transfer in the ground water and to derive the impact by the leachate. A kind of non-reacting conservative material, chloride ion is used as a tracer to quantify impacts by the leachate.

• 한국환경과학회지
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• 제29권11호
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• pp.1015-1024
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• 2020

Using the waste(sand wastr and boiler ash) in fluidized bed inciverator, lightweight aggregate concrete was produced and a recycling plan was prepated. The first, the result of the leaching test shows that the waste fluid sand and boiler ash did not exceed the effluent standard. This indicates that there is no harmful effect for recycling. The second, in the lightweight aggregate test using waste fluid sand and boiler ash, the sample that combined cement, waste fluid sand, and sand showed the highest compressive strength, and the mix proportion was 10: 7: 3. Lightweight aggregate concrete that combined cement, waste fluid sand, boiler ash, and sand had a low compressive strength by and large. The third, the same results were identified in the relation between the content of SiO₂ and that of Na₂O. As the SiO₂ content is lowered, the overall viscosity and plasticity of the concrete also decrease, which is not a good condition to form concrete. As for Na₂O, as the content increases, the viscosity of the sample and the viscosity of the cement are remarkably lowered, and the strength of the finished concrete is lowered. Therefore, it was concluded that the higher the content of SiO₂ and the lower the content of Na₂O, the more suitable it is to mix with cement to produce concrete. Fourth, from the fluidized bed incinerator currently operated by company A in city B, a total of 14,188 tons/year were discharged as of 2016, including 8,355 tons/year of bottom ash (including waste fluid sand) and 5,853 tons/year of boiler ash. The cost for landfill bottom ash and boiler ash discharged is 51,000 won/ton, and the total annual landfill cost is 723,588,000 won/ year. Assuming that the landfill tax to be applied from the year 2018 is about 10,000 won/ton, and if there is no reduction in waste disposal charge, an additional landfill tax of 141,880,000 won/year will be imposed. Consequently, the sum total of the annual landfill cost will be 865,468,000 won/year. Therefore, if the entire amount is used for recycling, the annual savings of about 8.7 billion won can be expected.

• 지질공학
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• 제11권3호
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• pp.245-254
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• 2001

처분덮개는 중.저준위 방사성폐기물 천층처분시설의 성능 유지에 중요한 역할을 하므로 여러가지 시험과 장기관측을 통한 처분덮개의 성능실증 연구는 시설의 안전성 확보에 불가결한 요소이다. 처분덮개의 기본적인 성능요건으로는 불투수성, 건전성, 열화에의 저항력 및 유지보수의 용이성 등을 고려할 수 있다. 이러한 성능요건을 단일층으로는 충족하기 어려운 점을 고려하여 HELP(Hydrologic Evaluation of Landfill Performance) 코드를 사용한 물수지 평가를 통해 상부 보호층, 중간 배수층 및 하부 저투수층 등으로 구성된 다층덮개 개념을 도출하였다. 처분덮개 내에서의 수분이동특성을 규명하기 위해 TDR(Time Domain Reflectometry)과 Tensiometer를 사용하여 각각 함수비와 matric potential의 변화를 3$\times$3$\times$3.3m 크기의 6개 시험고에서 장기관측 할 수 있도록 설계하였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.144-148
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• 2001

A geophysical and geochemical study was performed to verify the depth of landfill as well as the horizontal/vertical distribution of leachate at the landfill site located in Gongju. The electrical resistivity, with dipole-dipole array and dipole spacing of 5m, was applied along the nine survey lines and electromagnetic induction survey was conducted along the perimeter traverse surrounding the landfill. Cations, anions and stable isotope ($\delta$D and $\delta$$^{18}$ O) analyses were performed on about 63 water and leachate samples collected in dry and rainy seasons at 31 sites. The result of electromagnetic induction survey make it possible to derive the potential route of leachate in the past or present. The imaging of processed resistivity field data show that the possible route of leachate doesn't exist except the survey line 7. The weak zone traversing the landfill, however, is revealed by the electrical resistivity imaging, which may be the potential route of leachate toward the deep ground. The geochemical data agree well with geophysical data for deducing possible route of leachate of the site.

• 한국산업보건학회지
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• 제28권2호
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• pp.135-143
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• 2018

Objectives: There have been many studies on exposure assessment of workers at companies using asbestos as a raw material and at sites of the removal of materials containing asbestos. However, no research has been carried out on the asbestos exposure of workers in industries involving asbestos-containing waste, such as workers at collection and transportation service companies, mid-treatment companies(solidification of asbestos-containing waste), and landfill sites. The objective of this study was to assess the asbestos exposure concentrations of workers in industries handling waste containing asbestos. Methods: For this study, we carried out field investigations at 15 companies: seven collection and transportation service companies, three mid-treatment companies, and five final treatment companies(landfill sites). We took both personal and area samples. Results: The range of asbestos exposure levels of workers handing asbestos-containing wastes at collection, mid-treatment, and landfill companies were 0.000 fibers/cc-0.009 fibers/cc, 0.000 fibers/cc-0.038 fibers/cc, and 0.000 fibers/cc-0.024 fibers/cc, respectively. Conclusions: The asbestos exposure levels of workers at mid-treatment companies were higher than those at collection and transportation companies and at final treatment companies. In the case of collection and transportation workers, the possibility of exposure to levels exceeding those found in the present study is not particularly high considering the characteristics of the work. However, in the case of intermediate or final disposal workers, it is considered that there is a possibility of exposure to levels above those found in this study.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1472-1477
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• 2009

매립지반이 주로 사질토로 구성되어 있거나 호박돌을 많이 함유하고 있는 지반이나 쓰레기 매립지반에서는 시공속도가 매우 빠르고 경제적 측면을 고려한 동다짐공법이 많이 적용되고 있다. 본 연구에서는 대구서부화물역 건설공사의 쓰레기 매립층에 적용된 동다짐공법에 대하여 지반개량효과를 분석하였다. 그 결과 중추낙하다짐 적용구간에 N치는 6.5/30에서 22.5/30으로 약 349% 증가하였다. 다짐전과 후의 지반고 측정결과 중추낙하다짐공법 적용구간은 0.706~1.729m가 침하되었다. 중추낙하다짐에 의한 $\alpha$값은 0.25~0.48로 폐기물층에 대한 일본토질공학회(1987)의 연구결과(0.3~0.5) 및 광산폐기물에 대한 Lukas(1986)의 연구결과(0.35~0.4)와 유사한 범위를 보이고 있다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.189.1-189.1
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• 2011

Global warming effect was intensified due to rapid growth of fossil fuel consumption caused by urbanization and industrialization. Various efforts was being done to solve the problems leading to anomaly climate such as flood, downpour, heavy snow. As a results of international efforts for management of global warming, Kyoto Protocol, which was passed in Kyoto, Japan in 1997, designated $CO_2$, $CH_4$, $N_2O$, HFCs, PFCs, $SF_6$ as a global warming gases. And IPCC(Intergovernmental Panel on Climate Change) suggested IPCC guideline for systematic establishment of national greenhouse gas inventory. Among five categories in IPCC guideline, the representative emission source of waste category is SWDS(solid waste disposal site). The concentrative research should progress for effective management of greenhouse gas related with waste. In this study, Tier1 and Tier2 methods which was suggested by 2006 IPCC(Intergovernmental Panel on Climate Change) guideline, was used to predict methane generation from C sanitary landfill located in Chungju area. To predict methane generation from C sanitary landfill, all factors were defaults values that were provided by 2006 IPCC guideline and Korea emission factors for Tier1 and Tier2 method. And economics of generated methane was estimated. From the predicted result using IPCC guideline, the methane generation was persistingly increased over a 9-year period(2000 ~ 2008). Aggregated amount of methane generation was about 3,017ton and 3,170ton predicted by Tier1 and Tier2, respectively. From the results of estimated economic value gained by generated methane from the C sanitary landfill for ten years from now(2010 ~ 2020), the profit was about 2.39 ~ 2.76 hundred million won.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.146-147
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• 2013

The oyster shells of about 240,000 tons have been annually produced in south coast of South Korea. However, about 25% of the oyster shells (60,000tons) was recycled as oyster seeding and fertilizer due to the limited amount of consumption for such purposes. The stored amount of oyster shell in the fertilizer manufacturing company is overfilled, and thus cannot accept any more of the waste oyster shells. As a result, landfill and illegal dumping of waste oyster shells have become an increasingly serious issue since 2011. In this research, the problems generated by the oyster shells were investigated through surveying activities. One of the possible alternative solutions that can process large amount of waste economically was found to be the application of oyster shells as a construction materials.

• 유기물자원화
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• 제27권1호
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• pp.65-75
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• 2019

정부는 '자원순환기본법'의 제정 및 '폐기물관리법'의 개정으로 폐자원의 재활용 방향성을 확대하고 재활용 다양화 등 처리개선을 통한 미처리폐기물의 매립제로화를 추진하고 있다. 2015년 기준 국내 전체 폐기물 매립처분량은 38,308 톤/일이며 그중 사업장배출시설계폐기물의 매립처분량은 23,577 톤/일로 매립폐기물 중 약 62 %를 차지하고 있다. 본 연구에서는 주로 유기성 및 가연성 물질의 연소 및 소각, 특정 성분의 추출 및 공정 구성에서 활용된 후 폐기처분되는 열적처리잔재물의 특성을 파악하여 재활용 관련 기준에 따른 매립저감 효과 예측 및 매립 처분 감소 가능량을 추산하여 고찰하였다. 그 결과, 사업장배출시설계폐기물의 매립처분량은 전체 매립량의 약 62 %로, 이 중 소각재, 연소재 등의 열적처리잔재물류가 45.1 %을 차지하고 있다. 2035년 국가 매립목표 1 % 달성을 위해 열적처리 잔재물이 매립억제 주요대상 폐기물로 판단되었다. 또한 열적처리 잔재물의 재활용 기준을 확대하고 매립억제 정책 추진 시 현재 매립처분량 대비 약 5~42 %의 매립감소가 가능할 것으로 추산되었으며 매립처분 최소화를 위해 폐자원 재활용 유형의 다양성 확대와 재활용 제품의 의무사용 확대 방안이 필요할 것으로 판단되었다.