• 한국대기환경학회지
• /
• 제22권6호
• /
• pp.743-757
• /
• 2006

Volatile organic compound (VOC) has been well-known to Korea since the end of 1990's however, it has not been well documented until now. In this study, present ambient VOC levels, VOC emission sources, and VOC control technologies were reviewed and discussed. In addition, VOC management strategies to cut down ozone concentrations were suggested based on the present VOC database. For anthropogenic VOC reduction, VOC emitted from painting processes and automobiles should be controlled in the first place in large cities such as Seoul, Daegu, and Incheon. For natural VOC management, low emission trees need to be planted in those cities. It is also very significant to keep updating present and future VOC emission inventories for efficient VOC control strategies. As a conclusion, more systematic VOC control road-map based on BACT (best available control technology) needs to be made up. and more economical and efficient VOC control techniques have to be developed under strong national support in order to lower toxic VOC and photochemical oxidant levels.

• KIEAE Journal
• /
• 제1권1호
• /
• pp.35-43
• /
• 2001

The VOC, which were detected from the newly built house, exist as a certain number of types according to the characteristics of the change of VOC concentration indoors. In this paper, we aim to divide the VOC into types so that those with similar characteristics of the transition of their concentration are in the same group and select the representative compound according to each classified type, and to verify these processes statistically in order to verify and propose new method creating the representing index of the VOC concentration in indoor which is used in evaluation of the degree of air pollution. As a result, the characteristic of the change of VOC concentration in the indoor can be divided into three types. Type1; the group in which the concentration is relatively high right after the completion of the house, and then decreases rapidly. Type2; the group in which the concentration is relatively low right after the completion of the house, and then although it shows the tendency of increasing and decreasing repeatedly, it decreases overall. Type3 is the group, which show only one peak at a certain time during the measuring period. As the method like this was verified to have the statistical significance, the Ethylbenzene was selected as the representative compound of type1, and Styrene was selected as that of type2. Moreover, if considering transition of the VOC from the point of similarity, the research method of making the classification and the selection of the representative compound in this study are said to be significant method.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
• /
• pp.271.1-271.1
• /
• 2013

Titania is usually used in sun-screens, tooth paste, and other daily used objects as a pigment. However, scientists have focused on titania as photocatalyst due to its excellent activities. By fabricating vanadium doped TiO2 and CuOx co-catalyzed TiO2 nano-size filter, the degradation level of the volatile organic compound (VOC) concentration was tested using 365nm UV LED as light source in a closed chamber. Main purpose for this test is to evaluate the activities of various catalysts for degrading the VOCs which are detrimental to human body and toluene and p-xylene were chosen in the VOC removal test. Target gas materials were injected into the test chamber with dry air as carrier gas which was flowed into the gas washer bottle filled with liquid form of VOC substance. When the VOC gas flows into the chamber, it is circulated by 200 mm fan in order to contact with the set-up filter on the aluminum holder. Target gas concentration in the chamber was monitored using VOC detector (miniRae3000, Raesystems) which was also placed inside the chamber. With the measured concentration, the VOC degradation efficiency and the degradation rate were evaluated and used to compare the catalytic activities.

• 설비공학논문집
• /
• 제13권7호
• /
• pp.627-636
• /
• 2001

This paper presents a numerical analysis of the emission process of volatile organic compound(VOC) from building material and its diffusion in a room. A polypropylene styrene-butadiene rubber(SBR) floor plate is chosen as the emission source of VOC. This study investigates spatial concentration distributions and time history of room-averaged VOC concentration for both with and without flushing. The results of this study show that for calculation based on ten-days period the room averaged VOC concentrations with and without flushing are quite different. the results thus suggest the need of flushing for new buildings.

• 설비공학논문집
• /
• 제19권4호
• /
• pp.285-290
• /
• 2007

This study has been numerically conducted to investigate the removal efficiency of Volatile Organic Compound (VOC) in photocatalytic micro-reactor. This study has placed emphasis on the improvements of the working condition of photocatalytic micro-reactor. The micro-reactor consists of 19 microchannels with a rectangular cross-section. For the validation of the current numerical study, a computation has been carried out to simulate an existing experimental study on the cylindrical reactor, which has shown a good agreement. The degradation characteristics with different inlet concentrations and velocities have been obtained. The current results can be used for the design of advanced photocatalytic micro-reactor.

• 한국대기환경학회지
• /
• 제22권6호
• /
• pp.758-766
• /
• 2006

A two-stage bioreactor, which consists of a biotrickling filter module and a biofilter module in series, was investigated for the enhanced treatment of a VOC mixture, toluene and methyl ethyl ketone (MEK). Throughout the experiments, the overall inlet loading rate was maintained at approximately $43g/m^3/hr$, but the inlet ratios of the VOCs were modified. The experimental results showed that the different ratios of the VOC mixture resulted in changes of overall removal efficiencies, elimination capacities (ECs) and microbial accumulation on the surface of each packing material. The ratio of inlet toluene to MEK at 50 : 150 was found to be most effective in terms of the overall removal efficiency, because, at this condition, MEK (i.e., the hydrophilic compound) was mostly removed in the biotrickling filter module and the following biofilter module was used to remove toluene. It was also found that when the inlet loading rate of the VOC mixture was serially increased stepwise within short-term periods, the ECs for toluene dropped significantly but the ECs for MEK increased at the ratio of the VOC mixture. These results implied that substrate interaction and/or substrate preferable utilization might have an effect on the biological removal of each compound in the two-stage bioreactor; therefore, the bioreactor should be operated in the condition where the substrate interaction could be minimized in order to maximize overall performance of the two-stage bioreactor.

• 한국에너지공학회:학술대회논문집
• /
• 한국에너지공학회 1999년도 추계 학술발표회 논문집
• /
• pp.197-204
• /
• 1999

VOC(volatile organic compound)는 도료제조, 자동차, 선박의 도색, 인쇄, 염색 공정에서 주로 발생하는 휘발성 유기화합물로서 호흡기로 들어가면 중추신경 등 주요 기관의 장애를 일으킬 수 있으며, 질소화합물과 광화학반응을 일으켜 오존을 유발하는 위험물질이다. 정부에서는 1991년 대기환경보존법을 제정하여 유기용제의 배출을 규제하고 있고, 이 법에 따라 금년부터 석유화학정제업, 저유소에 VOC 방지시설을 의무적으로 설치해야 한다.(중략)

• 설비공학논문집
• /
• 제16권1호
• /
• pp.1-7
• /
• 2004

This study has been numerically conducted to investigate the removal efficiency of Volatile Organic Compound (VOC) for different photocatalytic honeycomb filters. Recently, the photocatalysis is being applied to air-cleaner, air-conditioner and vacuum-cleaner with the capability of air-purification, sterilization and antibiosis. However, photocatalysis is less efficient than other methods for removing VOC except in the case of low concentration. So far most of studies have focused on an improvement of the photocatalytic materials, but this study have placed emphasis on the improvements of shape of photocatalytic honeycomb filter. UV irradiation, concentration profile and pressure drop have been investigated for different cross sections of filters and for different filter lengths. Light intensity is dropped sharply with increasing distance from the UV-lamp, and becomes very low in the middle of the filters. Since photocatalytic reaction rate is a function of light intensity, VOC concentration gradient might be small in the middle of long filters. Thus, most of reaction have risen within only three times of dimensionless axial distance. These results can be used effectively for the design of advanced photocatalytic honeycomb filters.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2007년도 동계학술발표대회 논문집
• /
• pp.132-135
• /
• 2007

VOCs(Volatile Organic Compounds) have been recently enacted by several regulations to the environment since the end of 1990's. So, it need to control emissions of VOCs from industrial cite. VOC controls include all technologies which either collect the VOCs for recovery and reuse or destroy the VOCs. In this study, the VOC control technical trend was searched. Additionally, it was compared to the number of patent along to the year in Korea.

• 한국토양환경학회지
• /
• 제2권1호
• /
• pp.83-90
• /
• 1997

저농도의 난 수용성 VOC가스가 포함되어 있는 다량의 오염가스를 처리하기 위하여 흡수탑과 생물반응기의 결합체인 새로운 처리시스템을 제시하였다. 바이오스크러버의 스크러버에서는 세정액으로 기상중의 처리대상오염물질의 흡수가 일어나며 세정액은 생물반응기로 이송되어 호기성 미생물이 오염물을 분해시킨다. 본 연구에서는 폐가스중의 VOC분리를 위하여 재순환가능한 고비점용매를 사용하였다. 고비점용매를 포함한 세정액은 기/액 향류접촉이 이루어지는 흡수탑의 충전층에서 폐가스중의 오염물을 분리한다. 흡수탑은 Pall ring충전제로 채워 실제공정을 모사 하고자 하였다. 흡수처리후 생물반응기로 이송된 흡수액은 재생 후 다시 흡수탑으로 재 순환하였다. 실험에 사용된 대상가스는 농도가 400 mg/$\textrm{m}^3$ 인 톨루엔으로, 세정액이 가스흐름과 향류로 약 10~15L/min의 유량으로 충전층을 적시며 내려오는 충전탑내부로 약 100 L/min의 유량으로 도입하였다. VOC처리를 위해 제작된 본 바이오스크러버에서 고비점용매를 이용한 연속실험결과 최적운전 조건에서 약 80%의 처리율을 얻을 수 있었다.