• Proceedings of the SAREK Conference
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• 2008.11a
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• pp.541-545
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• 2008

Particulate matter (PM) is one of the major indoor air pollutants especially in the subway station in Korea. In order to remove PM in the subway station, several kinds of PM removal system such as roll-filter, auto-washable air filter, demister, and electrostatic precipitator re used in the air handling unit (AHU) of subway station. However, those systems are faced to operation and maintenance problems since the filter-regeneration unit consisting of electrical or water jet parts is malfunctioned due to the high load of particulates and the filter material needs periodic replacement. In this study, we surveyed the particle removal systems in order to develop the new system of particle removing can be adopted in the current AHU of subway station.

• Korean Journal of Plant Resources
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• v.28 no.5
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• pp.665-674
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• 2015

The final goal of this research is to develop a botanical biofiltration system, which combines green interior, biofiltering, and automatic irrigation, which can purify indoor air pollutants according to indoor space and the size of biofilter. The biofilter used in this experiment was designed as an integral form of water metering pump, water tank, blower, humidifier, and multi-level planting space in order to be more suitable for indoor space utilization. This study was performed to compare indoor air quality between the space adjacent to a botanical biofilter and the space away from the biofilter (control) without generation of artificial indoor air pollutants, and to evaluate plant growth depending on multiple floors within the biofilter. Each concentration of indoor air pollutants such as TVOCs, monoxide, and dioxide in the space treated with the biofilter was lower than that of control. Dracaena sanderiana ‘Vitoria’ and Epipremnum aureum ‘N Joy’ also showed normal growth responses regardless of multiple floors within the biofilter. Hence, it was confirmed that the wall-typed botanical biofilter suitable for indoor plants was effective for indoor air purification.

• Journal of the Korean Solar Energy Society
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• v.30 no.1
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• pp.13-18
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• 2010

This research investigated the exhaust gas purification system of gaseous ozone for pigpens. This system is applied to exhaust the gas outside after purification with ozone. This is very effective for purification and simple. And because this is not set in the pigpens, this system is not influence of pollution gas. This is effected to extend the life time of this system and this system is applied for non-window pigpens which does not need the ventilation.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.69-70
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• 2003

최근 실내공기 질(IAQ : Indoor Air Quality)에 관한 인식이 높아지고 있으며 환경개선에 상응하는 기술 개발의 중요성이 크게 부각되고 있다. 실제 산업체에서는 여러 가스정화기술들이 오염물질제거에 이용되어 왔고, 그 한 분야인 N.T.P(Non-thermal plasma Process) 공정도 다양한 각도에서 연구가 수행되어 왔다. 그러나, 이 기술의 실용화를 위한 설계변수 개념의 연구는 부족한 실정으로, 이에 본 연구는N.T.P 공정에 의한 가스정화의 반 경험식 도출과 이를 이용한 성능 평가 고찰이 주목적이다. 또한, 반응기 통과 후 나오는 부산물을 동정하여, 차후 후단에 사용할 촉매를 결정 하고자 한다. (중략)

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05b
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• pp.103-108
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• 2003

산업화에 기인하여 공장 및 수송수단 증가로 대기배출가스량이 증가 그 결과 대기오염이 심화되어 가고 있다. 그러므로 실내오염가스의 정화가 우선적으로 고려되어야 하므로 이러한 오염된 공기를 제거 할 수 있는 장치의 개발이 절실히 요구되어지고 있다. 본 연구는 환경오염물질 제거를 위한 선 대 평판형 플라즈마 반응기 제작에 필요한 최적조건을 도출하기 위하여 반응기 내부의 전위 및 전계분포에 대한 시뮬레이션을 하였고 여기서 도출된 결과를 바탕으로 플라즈마 반응기를 제작하고자 한다.

• Economic and Environmental Geology
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• v.35 no.3
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• pp.221-227
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• 2002

Column experiments were performed to evaluate the removal efficiency of soil vapor extraction (SVE) iota TCE (trichloroethylene) and toluene in soil. Homogeneous Ottawa sands and real soils collected from contaminated area were used to investigate the effect of soil properties and SVE operation conditions on the removal efficiency. In column teats with two different sizes of Ottawa sand, the maximum effluent TCE concentration in a coarse sand column was 442 mg/L and 337 mg/L in a fine sand column. However, after 20 liter gas flushing, the effluent concentrations were very similar and more than 90% of initial TCE mass were removed from the column. For two real contaminated soil columns, the maximum effluent concentration decreased 50% compared with that in the homogeneous Ottawa coarse sand column, but 99% of initial TCE mass were extracted from the column within 40 liter air flushing, suggesting that SVE is very available to remove volatile NAPLs in the contaminated soil. To investigate the effect of contaminant existing time on the removal efficiency, an Ottawa sand column was left stable for one week after TCE was injected and the gas extraction was applied into the column. Its effluent concentration trend was very similar to those for other Ottawa sand columns except that the residual TCE after the air flushing showed relatively high. Column tests with different water contents were performed and results showed high removal efficiency even in a high water content sand column. Toluene as one of BTEX compounds was used in an Ottawa sand column and a real soil column. Removal trends were similar to those in TCE contaminated columns and more than 98% of initial toluene mass were removed with SVE in both column.

• 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.

• Clean Technology
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• v.4 no.2
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• pp.32-40
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• 1998

The polymeric porous materials which consist of polypropylene(PP) and polyethylene(PE) powder were prepared to apply to the air purification systems by extrusion sintering method. SEM analysis showed that a composite polymeric porous structure made up of PP and PE was obtained, where PE was melted and adhered to PP because the melting temperature of PE was lower than that of PP. The filtration characteristics and mechanical properties of polymeric porous materials were investigated by varying the head die temperature of the extruder, extrusion velocity, and the melt index and quantity of PE. The filtration efficiency was proportional to the quantity of PE but inversely proportional to the melt index of PE. The polymeric porous materials composed of PP and PE, which was made by extrusion sintering method, was found to be suitable for the filter element of the air purification system.

• Journal of Environmental Health Sciences
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• v.33 no.4
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• pp.250-254
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• 2007

The reduction efficiency of air cleaner on particulate contaminants such as dust, airborne bacteria and fungi distributed in the office was relatively higher in case of office with workers than office without workers. This result would be attributed to workers' activities and physical characteristics of particulate contaminants. The air cleaner decreased a concentration of airborne bacteria more than airborne fungi, which implicates that difference of dust adsorption between airborne bacteria and fungi would affect an operation efficiency of air cleaner.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.231-232
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• 1999

근래에 우리나라에서도 광촉매를 이용한 환경기술에 대한 관심이 높아지고 있는데 산화티타늄 광촉매가 가지고 있는 자기정화기능(self-cleaning)과 초친수성을 이용하는 기술 및 공기중의 악취제거(탈취)는 이미 일본에서는 실용화되고 있다. 또한 대로변 혹은 터널에서는 대기 중의 질소산화물 농도가 환경기준치를 초과하는 경우가 많은데 이러한 저농도(0.1 ppm정도)의 질소산화물제거에 광촉매를 이용하고자 하는 적용시험도 진행되고 있는 일본에서는 이와 같이 광촉매가 다방면에 이용 혹은 이용이 시도되고 있는 와중에 광촉매에 대한 맹신 혹은 과대선전에 대한 우려 또한 제기되고 있다(공업재료(일본), 1999).(중략)