• Title, Summary, Keyword: VOCs

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A Study on the Development of VOCs Detector

  • Suh, Jung-Ho;Suh, Myung-Gyo;Hong, Won-Hak;Lee, Young-Sei
    • Proceedings of the Korean Environmental Health Society Conference
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    • pp.139-141
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    • 2004
  • Emission of volatile organic compounds (VOCs) are one of the popular issues of air pollution in Korea, especially in Ulsan city, where much chemical plants are located. It is necessary to detect the VOCs precisely in order to control the air pollution during the plant operation. In general, to examine the concentration of VOCs, gas chromatography (GC) is used. However, most plant operators are using the easy operating handy VOCs detector, which is imported, because GC is difficult to treat and the installation price is high although it is very useful equipment. Therefore, the development of the VOCs detector becomes one of the urgent issues. In this study, sensing characteristics of selected VOCs for the development of VOCs detector was investigated. Semiconductor sensor and several VOCs such as aliphatic, aromatic, and non-homogeneous hydrocarbons were used for the experiment. Through the various experiments, sensor used in the experiment has shown high linearity and sensitivity for most VOCs in the range of 1 -500 ppm concentration.

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Development of Source Profiles and Estimation of Source Contribution for VOCs by the Chemical Mass Balance Model in the Yeosu Petrochemical Industrial Complex (여수석유화학산단 내 VOCs에 대한 오염원 분류표의 개발 및 CMB 모델에 의한 기여도 산정)

  • Jeon Jun-Min;Hur Dong;Kim Dong-Sul
    • Journal of Korean Society for Atmospheric Environment
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    • v.21 no.1
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    • pp.83-96
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    • 2005
  • The purposes of this study were to characterize the local levels of VOCs (volatile organic compounds), to develop source profiles of VOCs, and to quantify the source contribution of VOCs using the CMB (chemical mass balance) model. The concentration of VOCs had been measured every 6-day duration in the SRO monitoring site in the Yeosu Petrochemical Industrial Complex from September 2000 to August 2002. The total of 35 target VOCs, which were included in the TO-14 designated from the U.S. EPA, was selected to be monitored in the study area. During a 24-h period, the ambient VOCs were sampled by using canisters placing about 10 ~ 15 m above the ground level. The collected canisters were then analyzed by a GC-MS in the laboratory. Aside from ambient sampling at the SRO site, the VOCs had been intensively and massively measured from 8 direct sources and 4 general sources in the study area. The results obtained in the study were as follows; first, the annual mean concentrations of the target VOCs were widely distributed regardless of monitoring sites in the Yeosu Petrochemical Industrial Complex. In particular, the concentrations of BTX (Benzene, Toluene, Xylene), vinyl chloride were higher than other target compounds. Second, based on these source sample data, source profiles for VOCs were developed to apply a receptor model, the CMB model. Third, the results of source apportionment study for the VOCs in the SRO Site were as follows; The source of petrochemical plant was apportioned by 31.3% in terms of VOCs mass. The site was also affected by 16.7% from wastewater treatment plant, 14.0% from iron mills, 8.4% from refineries, 4.4% from oil storage, 3.8% from automobiles, 2.3% from fertilizer, 2.3% from painting, 2.2% from waste incinerator, 0.6% from graphic art, and 0.4% from gasoline vapor sources.

Oxidation characterization of VOCs(volatile organic compounds) over pt and ir supported catalysts (Pt와 Ir을 담지한 촉매에 의한 휘발성유기화합물들의 산화특성)

  • Kim, Moon-Chan;Yoo, Myong-Suk
    • Analytical Science and Technology
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    • v.18 no.2
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    • pp.130-138
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    • 2005
  • Volatile organic compounds (VOCs) have been recognized as major contributor to air pollution. Catalytic oxidation in VOCs can give high efficiency at low temperature. In this study, monometallic Pt, Ir and bimetallic Pt-Ir were supported to $TiO_2$. Xylene, toluene and methyl ethyl ketone (MEK) were used as reactants. The monometallic or bimetallic catalysts were prepared by the excess wetness impregnation method and characterized by XRD, XPS and TEM analysis. Result reveal that Pt catalyst has higher conversion than Ir catalyst and Pt-Ir bimetallic catalysts. The existence of multipoint actives in, Pt-Ir bimetallic catalysts gives improved performance for the Pt metalstate. Bimetallic catalysts have higher conversion for VOCs than monometallic ones. The addition, VOCs oxidation follows first order kinetics. The addition of small amount of Ir to Pt promotes oxidation conversion of VOCs.

Exhaust VOCs Emission Characteristics from Motor Vehicles (자동차의 배기관 VOCs 배출 특성)

  • Lyu, Young-Sook;Ryu, Jung-Ho;Han, Jong-Soo;Kim, Sun-Moon;Lim, Cheol-Soo;Kim, Dae-Wook;Lee, Dong-Min;Lee, Joong-Koo;Eom, Myung-Do;Kim, Jong-Choon
    • Journal of Korean Society for Atmospheric Environment
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    • v.24 no.3
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    • pp.275-283
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    • 2008
  • Since mobile source is a major source of VOCs, quantifying emissions from motor vehicles is an important factor to control VOCs in atmosphere. In this study, in order to evaluate tailpipe VOCs emissions from motor vehicles, mass emissions of non-methane volatile organic compounds from 45 vehicles were determined. Measurements were made on a chassis dynamometer using CVS-75 mode and speed specific drive modes. Target VOCs are 53 compounds determined as the volatile ozone precursors. The individual VOCs composition of vehicle emission and emission rates were also determined. In case of gasoline vehicles, VOCs emission from over 80,000 km vehicles were about 46% larger than less 80,000 km vehicles. The difference in benzene and toluene according to driving mileage was 44% and 26% respectively. The composition of VOCs were different by fuel type. The order of VOCs composition was paraffins>aromatics>olefins in gasoline vehicle emissions, paraffins>olefins>aromatics in light duty diesel vehicle emissions. The VOCs emissions were decreased as vehicle speed increasing. These results will be used to calculate total VOCs emissions from automobiles in the future.

Comparison of VOCs Concentration Characteristic According to Measurement Methods in Exhibition Hall (휘발성유기화합물(VOCs)의 측정방법에 따른 유물 전시관 내 농도 분포 특성 비교)

  • Lim, BoA;Lee, Sun Myung
    • 보존과학연구
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    • pp.25-44
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    • 2014
  • In this study, measured annual year and seasonal concentrations of VOCs by Active type and Passive type using the measurement and analysis method in the exhibition hall and outdoor. It was compared with the correlation between the methods according the comparison of methods to measured concentrations. As a results, the annual average concentrations of TVOC in exhibition room($906.5{\mu}g/m^3$) was greater than for most of the study period, more than 1.8 times the standard in the Ministry of Environment. ${\Sigma}VOCs$ concentration of exhibition room by Active type was higher than Passive type. Some VOCs was decreased with the lapse of time a temporary increase tendencies was. The annual average I/O ratio of TVOC was 9.0, ${\Sigma}VOCs$ was confirmed to occur in a large amount inside the exhibition hall ${\Sigma}VOCs$ was studied to 34.0. Correlation coefficient of ${\Sigma}VOCs$ was 0.367. Toluene was 0.567 that the survey was the largest analysis to the relationship between the two methods.

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Distribution Characteristics of Volatile Organic Compounds (VOCs) in an Industrial Complex and in Affected Areas in Siheung and Ansan (시흥·안산 산단 및 영향지역의 휘발성유기화합물질(VOCs) 분포 특성)

  • Kim, Dong-Gi;Woo, Jung-Sik;Han, Hyun-Su;Kim, Yong-Jun;Kim, Woong-Soo;Hong, Soon-Mo;Kim, Jong-Soo;Yoon, Mi-Hye
    • Journal of Environmental Health Sciences
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    • v.46 no.3
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    • pp.256-266
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    • 2020
  • Objectives: The concentrations and distribution characteristics of volatile organic compounds (VOCs) in an industrial complex and surrouding affected residential areas were investigated in an effort to support the efficient management of VOCs. Methods: The atmospheric concentrations of VOCs were analyzed at sites around the Sihwa-Banwol complex located in the cities of Siheung and Ansan and in the surrounding affected residential areas. The appearance of VOCs and the characteristics of their temporal and spatial distribution were evaluated. Results: The total VOC concentrations in the industrial complex were detected at 1.9-2.3 times higher than in the affected areas, but the daily VOCs distributions showed similar patterns in both sites. In particular, it was confirmed that the composition ratio of the VOCs and concentration fluctuations over time in the affected areas are similar to those in the adjacent industrial complex. VOC levels in the affected areas were higher than in residential areas in cities without an industrial complex. Conclusions: VOCs in residential areas near an industrial complex were highly distributed due to the influence of continuous pollutant emissions from the industrial complex. Therefore, the management of VOCs in the atmosphere of the affected area is important for identifying and managing the sources of VOCs detected in high concentrations in the industrial complex.

Emission Characteristics of VOCs Distributions in Semiconductor Workplace (반도체 작업환경의 VOCs 농도분포 특성)

  • Lee, Jeong Joo
    • Journal of the Korean Society of Urban Environment
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    • v.18 no.4
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    • pp.503-509
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    • 2018
  • In this study, a Proton-Transfer Reaction-Time-of-Flight Mass spectrometer (PTR-TOF-MS) was used for the continuous monitoring of Volatile Organic Compounds (VOCs) emitted from semiconductor workplace such as photolithography (PHOTO), flat panel display (FPD), organic light emitting diode (OLED), etching (WET) process. The averaged VOCs mixing ratio in the such workplace, PHOTO was 6.5 ppm, FPH was 6.4 ppm, WET was 2.0 ppm and OLED was 1.3 ppm, respectively. The abundance of VOCs in the workplace were methyl ethyl ketone (MEK) with 2.8 ppm (69%) and acetaldehyde with 0.5 ppm (13.2%). Depending on the semiconductor process characteristics, various VOCs have been observed in the workplace. The VOCs mixing ratio are lower than the workplace regulation standard (TWA), it is necessary to continuously monitor and effectively manage these VOCs.

An Experimental Study on the VOCs Concentration Variation using a Petroleum Spill Imitation Trial Test Chamber (원유유출 모의시험 챔버를 이용한 휘발성유기화합물(VOCs)의 농도변화에 관한 연구)

  • Chung, Jin-Do;Lee, Dong-Hyun
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.4
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    • pp.393-398
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    • 2010
  • This study prepared and utilized an imitation trial test chamber for a petroleum spill to predict the concentration of discharged Volatile Organic Compounds in the air at the time of Tae-An peninsula's petroleum spill, which happened in December, 2007. The petroleum spill imitation trial test chamber measured and analyzed the concentration variation of total VOCs. As the ambient air velocity increased, so the concentration of VOCs decreased; and as the water temperature rose, the concentration of VOCs increased. Furthermore, it appears that total concentration of VOCs decrease by more than 90% 6 days after the initial petroleum spill compared to the initial concentration of VOCs.

A Treatment of Low-leveled High-volume VOCs Emitted from Printing Process Using Concentrator with Zeolite Adsorptive Honey Rotor and Catalytic Combustion System (제올라이트 흡착농축 및 촉매연소를 이용한 인쇄공정에서 발생되는 저농도 대풍량 VOCs 가스 제거)

  • Park, Chan-Gyu;Yoo, Nam-Jong;Choi, Bo-Kyung;Ko, Kwang-Baik
    • Journal of Environmental Science International
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    • v.18 no.3
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    • pp.283-288
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    • 2009
  • This is a study on the volatile organic compounds(VOCs) concentrator with zeolite adsorptive honey rotor and catalytic combustion system for abating VOCs emitted from printing industry. VOCs emitted from the printing industry is mainly caused by organic solvent of printing ink. The content of organic solvents in printing ink varies from 40% to 75% and its content in the gravure ink is higher than that in any other ink. The average concentrations of each VOCs are 139 ppm for toluene, 152.1 ppm for MEK, 256.9 ppm for methanol and 42.9 ppm for isopropyl alcohol. We used zeolite honeycomb for absorbent of VOCs concentrator and palladium for catalyst combustion system. This system abated over 96% of emitted total VOCs, 98% of toluene, 100% of MEK, 92% of methanol and, 100% of isopropyl alcohol. It is concluded that the low-leveled high-volume VOCs emitted from printing process were removed almost by concentrator with zeolite adsorptive honey rotor and catalytic combustion system.

The Characteristics of Bioremediation for VOCs in Soil Column (VOCs 처리를 위한 미생물의 토양복원화 특성)

  • 손종렬;장명배;조광명
    • Journal of environmental and Sanitary engineering
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    • v.17 no.1
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    • pp.52-56
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    • 2002
  • The study was carried out to evaluate the characteristics of biodegradation by Pseudomonas putida G7 in soil column. The reactor system was used to investigate mass transfer of VOCs as Toluene in a column of unsaturated soil. Determination of the fate of VOCs in unsaturated soil is necessary to evaluate the feasibility of natural attenuation as a VOCs remediation strategy. The objective of this study was to develop a mechanistically based mathematical model that would consider the interdependence of VOC transport, microbial activity, and sorptive interactions in a moist, unsaturated soil. Because the focus of the model was on description of natural attenuation, the advective VOCs transport that is induced in engineered remediation processes such as vapor extraction was not considered. It can be concluded that the coefficient for gas liquid mass-transfer was found to be a key parameter controlling the ability of bacteria to VOCs. Finally, it appeared that bioremediation technology of VOCs which are difficult to be decomposed by chemical methods.