• 한국지역지리학회지
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• 제11권6호
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• pp.559-570
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• 2005

본 연구는 부산시를 사례로 하여 인구변화가 쓰레기배출량에 미치는 영향을 파악하는데 목적이 있다. 연구결과는 다음과 같이 요약된다. 첫째, 부산시는 1995년 이후 인구수와 쓰레기배출량이 전반적으로 감소하는 경향을 보였다. 구별로 인구수와 쓰레기배출량의 증가와 감소에 따라 5개 유형으로 구분되었으며, 1995년과 2003년의 구별 인구수와 쓰레기배출량의 상대적 평가를 위한 Z값을 분석한 결과, 1995년은 5개 유형으로, 2003년 6개 유형으로 구분되었다. 둘째, 쓰레기배출량과 인구수, 용도지역(주거지역, 상업지역, 공업지역)별 면적 및 광공업생산액 간의 상관관계를 각각 파악한 결과, 인구수, 주거지역 면적의 순으로 매우 강한 정적 상관관계가 있는 것으로 나타났다. 또한, 인구수와 주거지역 면적간에 공선성이 존재하여 인구수가 쓰레기배출량 해석을 위한 중요한 요인임은 물론 주거지역 면적의 특성까지 포함하여 설명할 수 있다. 셋째, 인구수가 쓰레기배출량에 미치는 영향 정도를 분석한 결과, 인구수는 쓰레기배출량을 92%이상 예측할 수 있는 것으로 나타났다.

• Nuclear Engineering and Technology
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• 제43권2호
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• pp.149-158
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• 2011

Metal waste generated from the pyroprocessing of 10 MtU of spent fuel was classified by comparing the specific activity of a relevant radionuclide with the limit value of the specific activity specified in the Korean acceptance criteria for a lowand intermediate-level waste repository. A Korean Optimized Fuel Assembly design with a 17${\times}$17 array, an initial enrichment of 4.5 weight-percent, discharge burn-up of 55 GWD/MtU, and a 10-year cooling time was considered. Initially, the mass and volume of each structural component of the assembly were calculated in detail, and a source term analysis was subsequently performed using ORIGEN-S for these components. An activation cross-section library generated by the KENO-VI/ORIGEN-S module was utilized for top-end and bottom-end pieces. As a result, an Inconel grid plate, a SUS plenum spring, a SUS guide tube subpart, SUS top-end and bottom-end pieces, and an Inconel top-end leaf spring were determined to be unacceptable for the Gyeongju low- and intermediate-level waste repository, as these waste products exceeded the acceptance criteria. In contrast, a Zircaloy grid plate and guide tube can be placed in the Gyeongju repository. Non-contaminated Zircaloy cladding occupying 76% of the metal waste was found to have a lower level of specific activity than the limit value. However, Zircaloy cladding contaminated by fission products and actinides during the decladding process of pyroprocessing was revealed to have 52 and 2 times higher specific activity levels than the limit values for alpha and $^{90}Sr$, respectively. Finally, it was found that 88.7% of the metal waste from the 17${\times}$17 Korean Optimized Fuel Assembly design should be disposed of in a deep geological repository. Therefore, it can be summarized that separation technology with a higher decontamination factor for transuranics and strontium should be developed for the efficient management of metal waste resulting from pyroprocessing.

• 한국세라믹학회지
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• 제37권5호
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• pp.403-409
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• 2000

The permeation characteristics and reclamation efficiency of waste lubricating oil were studied as a function of the types of ceramic composite membranes and the membrane separation process variables. The oil permeability of the TiO2 composite membrane(pore size 0.015 $\mu\textrm{m}$) was directly proportional to the crossflow velocity(0.22∼0.9 m/s) and temperature(150$^{\circ}C$∼200$^{\circ}C$). In the batch concentration process, as the concentration factor increased, both the permeability and the ash content of the permeate decreased. The average ash contents of the total permeate through the A6 alumina membrane(average pore size 0.8$\mu\textrm{m}$), Z1/A6 and Z1/A4(pore size 0.23$\mu\textrm{m}$)/A7(pore size 6$\mu\textrm{m}$) zirconia composite membrances(average pore size 0.07$\mu\textrm{m}$) were about 0.063 wt%, 0.045wt% and 0.08wt% in the region of 1∼2 concentration factor, respectively. The ash content of the mixed permeate through the A6 alumina and zirconia composite membrane was about 0.06 wt% and it can be also reduced to 0.06 wt% in the Z1/A6 membrane and below 0.003 wt% in the TiO2/Z1/A6 membrane. It was concluded that the treated oil obtained from the multi-step membrane separation process could be used as reclaimed lubricating oil as well as reclained fuel oil.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 추계 학술대회 논문집
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• pp.124-125
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• 2005

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 춘계 학술대회
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• pp.276-277
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• 2005

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2012년도 추계학술논문요약집
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• pp.437-438
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• 2012

• 지질공학
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• 제25권1호
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• pp.57-66
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• 2015

부산 임기광산의 광산폐기물 적치사면을 대상으로 강우에 따른 사면의 침투해석과 안정해석을 연계하여 수행하였다. 광산폐기물 적치사면의 경사는 40-45°로써 비교적 급한 편이고, 암반층 상부의 광산폐기물은 약 7-8 m의 두께로 존재하며, 지하수위는 지표면으로부터 약 6.6 m 깊이에 위치하고 있다. 현장에서 채취한 시료를 대상으로 각종 실내시험을 수행하여 강우 시 침투거동 및 사면안정해석을 위한 입력자료를 선정하였다. SEEP/W를 이용하여 다양한 강우강도 조건에서 침투해석을 수행한 결과 강우지속시간이 길어짐에 따라 습윤전선은 하강함을 알 수 있다. 강우강도가 50 mm/hr 이상 이고 강우지속시간이 24시간 이상인 경우 침윤전선은 사면의 하단부에서 지하수위와 만나게 되므로 토층 전체가 포화됨을 알 수 있다. 침투해석결과를 연동하여 SLOPE/W를 이용하여 사면안정해석을 수행한 결과 강우침투로 인한 침윤전선이 하강함에 따라 사면안전율은 낮아짐을 알 수 있다. 강우가 5-6시간 지속적으로 발생된 이후 사면안전율은 급격하게 낮아지며, 이후 사면안전율이 미소하게 회복되다가 수렴한다. 사면안전율이 급격하게 낮아지는 이유는 강우로 인한 임계 활동면과 침윤전선의 깊이가 유사하여 해당깊이까지 간극수압이 증가되고 모관흡수력이 감소되었기 때문이다.

• 한국환경과학회지
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• 제20권1호
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• pp.137-146
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• 2011

In this research, food waste source reduction model for apartment was investigated. In spite of prohibition of direct landfill of food waste and continuous efforts made by government and local government, food waste production increases steadily. Recycling ratio of the food waste increases every year, but its products have many problems like low quality, stability, salt, odor etc. Household occupies 63.3% of whole food waste production and this is subject to be a key factor to control food waste. We surveyed S apartment in Kwangju city as a model case, in which administrative office and women's association adopted clean plate eating, separation of raw food waste and earth worm composting as a series of method for source reduction and recycling inside the apartment. With the help of residents' participation and practice, food waste production decreased 15.6% from 0.31 g/capita/day in 2007 to 0.26 g/capita/day in 2009 (domestic average 0.30 g/capita/day). Separation of raw food waste and its composting using earth worm were very effective, and were subject to resolve the problems of present food waste treatment technologies. And earth worm composting was very useful in environmental, economical, societal and educational aspects. Instead of economical incentive, educational programs about food value, environmental problem and critical method for food waste separation were more effective for promotion of source reduction. From the analyses on the process and success factors in this model, we could conclude that leader's role was one of the key factors for the settlement of source reduction, and that was to understand the seriousness of the food waste and to seek solution, to test techniques, and to practice by oneself. Furthermore, networking and collaboration among residents, local government, NGO and local press promoted residents' participation, and it was through various education and investigation. Finally, source reduction and self recycling model of food waste in the apartment, that applies separating raw food waste and earth worm composting based on the collaboration among residents, local government, NGO, and local press, should be disseminated, and environmental policy also should be changed to make it possible.

• 한국군사과학기술학회지
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• 제14권2호
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• pp.246-263
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• 2011

Mankind has just begun to recognize that the most crucial factor to achieve the sustainable society in the future is green technology. Most countries support the development of green technology to prevent catastrophes from global warming, mainly in the areas of reducing carbon dioxide from the atmosphere. However, most products we consume in everyday life are produced through chemical processes, and we often oversee the fact that the huge amount of waste and energy during these chemical processes will seriously influence our goal to achieve our future society sustainable. Thus the technologies to minimize the amount of disposed waste and energy consumption during chemical processes may be more important than to reduce the greenhouse gases. In this regard this review introduces the recent status of green chemistry and future prospects in order to help our chemists and engineers establish research projects based on the green chemistry principles.

• 방사성폐기물학회지
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• 제19권2호
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• pp.177-186
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• 2021

Radioactive materials from nuclear power facilities can be released into the atmosphere through various channels. Recently, the dispersion of radioactive materials has become critical issue in Korea after Kori Unit 1 and Wolsong Unit 1 were permanently shut down. In this study, annual atmospheric dispersion factors were compared based on the continuous release and purge release using the XOQDOQ computer program, a method for calculating atmospheric dispersion factors at commercial nuclear power stations. The meteorological data analyzed in this study was based on the Shin Kori nuclear power meteorological tower which has the largest operating nuclear power plants in Korea, for three years (from 2008 to 2010). The analysis results of the dispersion factor of the radioactive material release obtained using the XOQDOQ program showed that the difference between the continuous release and purge release was within two times. This study will be valuable helpful for revealing the uncertainty of the predictive atmospheric dispersion factor to achieve regulation.