• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.415-416
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• 2001

최근 환경오염에 대한 관심이 고조되면서 VOCs를 비롯한 각종 악취물질 제거에 광촉매가 각광받고 있다. 광촉매는 기존 오염물질 제거기술과는 달리 광촉매 하나로서 복합적인 오염물질을 한꺼번에 분해할 수 있는 장점이 있다. 그러나 미세한 광촉매 분말(powder)은 오히려 분진으로 작용할 수 있고, 회수가 어려워 응용에 있어 상당한 제약을 받는다. 이에 상용화된 TiO$_2$ 분말이나 졸을 지지체에 코팅한 TiO$_2$ 박막으로 광촉매의 응용 범위를 점차 확대해 나가는 추세이다. (중략)

• Journal of the Korea Organic Resources Recycling Association
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• v.31 no.3
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• pp.93-102
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• 2023

This study investigated the possibility of treating heavy metal pollutants existing in the air in addition to simultaneously removing NOx and SOx by injecting oxidizing and reducing agents into a scrubber into a microbubble device to create an eco-friendly method that does not generate secondary pollutants. Lead compound (Pb) was selected as the heavy metal substance in the air to be treated with microbubbles, and the removal efficiency was confirmed. By treating microbubbles by connecting them to a scrubber, it was confirmed that not only NOx and SOx but also heavy metal substances in the air were reduced, cost was reduced, and secondary environmental pollutants were not generated. Through this study, it was possible to simultaneously remove NOx, SOx, and heavy metals at low cost by applying an eco-friendly method, rather than the existing high-cost treatment method such as SCR. If oxidizing agent, reducing agent, and microbubbles are used appropriately, economical and efficient air pollution can be achieved. Since material processing was possible, it is expected to be helpful in the technological development of environmental prevention facilities.

• Journal of Environmental Impact Assessment
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• v.32 no.5
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• pp.291-304
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• 2023

Harmful algal blooms (HABs) have become an increasing concern in terms of human health risks as well as aesthetic impairment due to their toxicity. The reduction of water pollutants, especially nutrients from non-point sources in a reservoir watershed, is fundamental for HABs prevention. We investigated the pollutant removal efficiencies of a constructed wetland to evaluate its feasibility as a method for controlling non-point sources located in the Annaecheon stream within the Daecheong Reservoir watershed. The overall removal efficiencies of pollutants were as follows: BOD 14.3%, COD 17.9%, SS 50.0%, T-N 19.0%, and T-P 35.4%. These results indicate that constructed wetlands are effective in controlling pollutants from non-point sources. The seasonal variation in removal efficiency depended on the specific pollutants. The removal efficiencies of BOD, COD, and T-N were stable throughout the year, except during winter, which might have been influenced by lower microorganism activity. In contrast, T-P showed a consistent removal efficiency even during the winter season, suggesting that the wetland can reduce external phosphorus loading to the reservoir. Regarding the effects of pollutant loadings on removal efficiency, the effluent concentrations of all pollutants were significantly decreased compared to those in the influent in case of middle and high loadings. This demonstrates that constructed wetlands can handle high pollutant loads, including the initial runoff during rainfall, to prevent reservoir eutrophication. Despite the various strengths of wetland water purification, there are limitations as passive treatment. Therefore, more case studies should be conducted to suggest optimum operational conditions for constructed wetlands, taking into consideration reservoir-specific characteristics.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.4
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• pp.651-656
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• 2019

This paper is a study on the structure system and implementation of cantilever actuator for decontamination. There are many kinds of exterior materials that attach to the exterior walls of a building. Glass, in particular, can be contaminated in a short period of time due to external exposure. The pollutants like this damage the appearance of a building. It can also cause health problems for users, and dust attached to solar panels creates problems that greatly reduce the power generation of solar panels. In order to remove such contaminants, professional workers usually remove contaminants attached to the outer walls. However, even with stability, accidents are often caused by a number of unexpected variables that occur in the field. Thus, to overcome these shortcomings, the cantilever actuator structure system was proposed. The system was designed through research. Then, we made a cantilever actuator and checked its operability. Finally, the effectiveness of the cantilever actuator was reviewed.

• Journal of Korea Soil Environment Society
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• v.3 no.2
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• pp.101-114
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• 1998

Soil vapor extraction (SVE) is known to be an effective process to remove the contaminants from the soils by enhancing the vaporization of organic compounds using forced vapor flows or applying vacuum through soils. Experiments are carried out to investigate the effects of the organic contaminants, types of soils, and water contents on the removal efficiency with operating time. In the study, simulated soils include the glass bead which has no micropore, sand and molecular sieve which has a large volume of micropores. As model organic pollutants, toluene, methyl ethyl ketone, and trichloroethylene are selected. Desorption experiments are conducted by flowing nitrogen gas. Under the experimental conditions, it is found that there are linear relationships between logarithm of removal efficiency and logarithm of number of pore volumes. The number of pore volumes are defined as the total amount of air flow through the soil column divided by the pore volume of soil column. For three organic compounds studied, the removal rate is slow for no water content, while the number of pore volumes for removal of organic compounds are notably reduced for water contents up to 37%. For the removal of dense organic compound, such as trichloroethylene, a large number of pore volumes are needed. Also, the effects of the characteristics of simulated soils on the removal efficiency of organic compounds are studied. After the characterization of soil surface, porosity of soil columns and types of contaminants, the results could provide a basis for the design of SVE process.

• Journal of the KSME
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• v.55 no.6
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• pp.45-48
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• 2015

이 글에서는 저온 플라즈마를 이용한 연소로 배출 가스상 오염 물질을 제거하는 방법에 대해 소개하고자 한다.

• Proceedings of the Korean Geotechical Society Conference
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• 2003.03a
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• pp.185-188
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• 2003

오염된 지하수 정화에 있어 반응벽체(Permeable Reactive Barriers, PRBs)를 이용한 정화기법은 최근 가장 큰 관심을 모으고 있는 기술이다. 반응벽체의 적용에 있어 가장 중요한 사항은 오염물질의 특성을 고려하여 적절한 반응성을 가지는 충진물질을 선택하는 일이다. 지금까지 연구된 반응물질 중 제올라이트는 취득이 용이하고 가격이 저렴하여, 암모늄이나 중금속과 같은 양이온성 오염물질의 정화에 그 적용성을 인정받아왔다. 하지만 표면에 음전하를 띠는 제올라이트의 특성 때문에, 지하수내에서 음이온의 형태로 존재하는 Cr(VI) 등에는 반응성이 없는 것으로 알려져 왔다. 이에 본 연구에서는 제올라이트에 영가철을 결합한 ZanF란 물질을 개발하여 양이온성 중금속의 하나인 납과 음이온성 중금속의 하나인 Cr(VI)을 동시 제거하는 실험을 수행하였다. 실험결과 ZanF는 초기농도 2-15mmol를 가지는 납 오염용액에 대해 90% 이상의 제거율을 보였으며, 초기농도 0.1 mmol을 가지는 Cr(VI) 오염용액의 농도를 5시간 내에 검출한계 이하로 떨어뜨리는 탁월한 효과를 보였다. 실험결과를 토대로 ZanF는 납과 Cr(VI)으로 동시에 오염된 지하수 정화에 효과적으로 사용될 수 있으리라 기대된다.

• Journal of Conservation Science
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• v.22
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• pp.99-108
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• 2008

This research aimed to provide a scientific methodology for removing white and black/brown coloured stains on the wall paintings of tombs of Jinpari No 1 and No 4. in the Democratic People's Republic of Korea. For the analysis of chemical composition of stains of the samples from the wall paintings, a microscope and SEM/EDX were used. The analysis confirmed that the fomula of white coloured stains should be $CaSO_4$ or $CaCO_3$ and the black/brown coloured stains should be $CaSO_4$ or $CaCO_3$ with soil deposition. Because of the difficulties of testing several cleaning solutions on sample patches of large area of the painting, the author considered a risk-free cleaning solution as being the most appropriate one, with Ammonium bicarbonate and Anion exchange resin showing satisfactory cleaning effect without visible side effects. For the removal of dense layer of stains, the research suggested that physical cleaning should be followed by applying a cleaning solution.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.411-412
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• 2000

산업의 발달과 더불어 각종 화학물질들이 여러 산업공정에서 다양한 용도로 이용되고 있다. 인체에 유해한 독성 무기ㆍ유기화합물의 유출 사고나 부적절한 매립 등에 의해 이들 물질이 환경오염을 야기하는 것으로 보고되고 있다. 휘발성 유기화학물의 처리는 물리ㆍ화학적 방법이나 생물학적 방법으로 제거할 수 있다. 생물여과 공정은 오염된 가스를 반응기에 유입하여 고정된 충진물에 형성된 적절한 미생물 층을 이용하여 오염물질을 제거하는 것이다(Deshusses et al., 1995). (중략)

• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1682-1684
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• 2002

현재 국내에서 많이 연구 개발되고 있는 펼스코로나 방식은 자동차와 같은 소규모 오염 배출 원에 적용하기엔 경제적.기술적 한계를 가지고 있으며, 또한 3원 촉매법과 같은 화학촉매환원법은 사용조건이 엄격하고 일부 오염물질의 저감만이 가능하기 때문에 종합적인 공해물질 저감대책으로서는 한계가 있다. 따라서 자동차와 같은 소규모 오염배출원에 있어서 다양한 배기오염물질의 동시처리가 가능한 경제적이고 종합적인 공해물질 저감방법의 제시는 매우 중요한 당면 과제이다. 이에 따라 본 연구에서는 현재 본 연구팀이 보유한 전기재료 및 방전분석 기술을 바탕으로 최근 국외에서 자동차 배기가스에서 공해물질의 배출억제 방안으로 활발히 연구되고 있는 유전체방벽방전 방식에 대해 체계적 실험 분석 등을 통하여 보다 효율적인 공해물질 제거방법을 도출하고자 한다.