• Title/Summary/Keyword: volatile organic compound (VOC)

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Analysis of Photochemical Ozone Formation Regime in Busan - Comparative Study on Busan vs. Seoul Metropolitan Area(Ⅳ) (부산지역 광화학 오존 생성 regime 분석 - 수도권과 비교연구 (Ⅳ))

  • Seung-Hee Baek;Hyo-Jung Lee;Cheol-Hee Kim
    • Journal of Environmental Science International
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    • v.32 no.5
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    • pp.285-301
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    • 2023
  • This study analyzed characteristics of ozone (O3) formation regimes in Busan over a period of recent five years (2015~2019) and compared the findings with those obtained in Seoul. We employed four observed variations: early morning commuting-hour (i.e., 06:00-09:00 LST) nitrogen dioxide (NO2), peak-hour (i.e., 12:00-16:00 LST) O3, 8-hour average O3 (MDA8 O3), and △O3 (=O3_max- O3_min) in Busan and Seoul. In addition, the NO2-O3 relation was assessed to interpret which of NOx-limited or volatile organic compound (VOC)-limited was dominant. In Busan, the annual mean O3 concentration was relatively higher than in Seoul, whereas there were fewer high-concentration days. The Pearson correlation coefficients (R) between Early morning-hour NO2 and the Peak-hour O3 was positive (but close to zero) in Busan and negative in Seoul. Likewise, the R between the Early morning-hour NO2 and the △O3 showed a relatively considerable positive correlation (R=+0.4~0.5)(R=+0.4~0.5) in Busan, while a weak positive correlation (R=+0.1~0.2) in Seoul. From this result, it can be inferred that the O3 formation regime in Busan was intrepreted to be nearly neutral or relatively closer to the NOx-limited regime than Seoul, while Seoul to the VOC-limited regime. The study findings imply that O3 control strategies should be applied differently in Busan and Seoul. The results here were inferred from surface NO2 and O3 observations, and the varification studies based on in-situ VOCs measurements would be needed.

Biofilter Model for Robust Biofilter Design: 2. Dynamic Biofilter Model (강인한 바이오필터설계를 위한 바이오필터모델: 2. 동적 바이오필터모델)

  • Lee, Eun Ju;Song, Hae Jin;Lim, Kwang-Hee
    • Korean Chemical Engineering Research
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    • v.50 no.1
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    • pp.155-161
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    • 2012
  • A dynamic biofilter model was suggested to integrate the effect of biofilter-medium adsorption capacity on the removal efficiency of volatile organic compound (VOC) contained in waste air. In particular, the suggested biofilter model is composed of four components such as biofilm, gas phase, sorption volume and adsorption phase and is capable of predicting the unsteady behavior of biofilter-operation. The process-lumping model previously suggested was limited in the application for the treatment of waste air since it was derived under the assumption that the adsorbed amount of VOC equilibrated with biofilter-media would be proportional to the concentration of dissolved VOC in the sorption volume of biofilter-media. Therefore a Freundlich adsorption isotherm was integrated into a robust biofilter process-lumping model applicable to a wide range of VOC concentration. The values of model parameters related to biofilter-medium adsorption were obtained from the dynamic adsorption column experiments in the preceding article and literature survey. Furthermore a separate biofilter experiment was conducted to treat waste air containing ethanol and the experimental result was compared with the model predictions with various values of Thiele modulus (${\phi}$). The obtained value of Thiele modulus (${\phi}$) was close to 0.03.

Pervaporation Separation of Trace Dicholoromethane from Water Using Fluorinated Polysiloxaneimide do Membranes (불소계 폴리실록산이미드 공중합체막을 이용한 저농도 Dichloromethane 수용액의 투과증발)

  • Kim, Jeong-Hoon;Chang, Bong-Jun;Lee, Soo-Bok
    • Membrane Journal
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    • v.17 no.3
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    • pp.184-190
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    • 2007
  • This study reports on the pervaporation separation of a volatile organic compound(VOC), dichloromethane(DCM) from water using fluorinated copolysiloxaneimide membranes. The copolysiloxaneimide membranes were prepared from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA) and two diamines(polysiloxane diamine(SIDA), 2-(perfluorohexyl)ethyl-3,5-diaminobenzene(PFDAB)). By varying the ratio of flexible polysiloxane diamine(SIDA)/rigid fluorinated aromatic diamine(PFDAB) from 0/100 to 100/0 mol%, five copolysiloxaneimide membranes were prepared success- fully. The pervaporation properties of DCM/water were examined in terms of two diamine monomer ratio at room temperature and the feed composition of 0.05 wt% in water. It was found that the increase in SIDA content led to high permeation flux and pervaporation selectivity towards DCM by the enhanced sorption/sorption selectivity and diffusion coefficient/diffusion selectivity due to the increased hydrophobicity and fractional free volume.

A Study on Process Integrated Innovation System for a LNG Industry (휘발성 유기화합물의 배출량 산정 및 관리 소프트웨어 개발)

  • Yi Jonghyeop;Park Hyeonsoo;Lee Sunwoo;Kim Hwayong
    • Journal of the Korean Institute of Gas
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    • v.7 no.2 s.19
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    • pp.7-13
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    • 2003
  • Abstract This paper presents new emission mechanism and emission estimation model in volatile organic compounds(VOCs) emission sources. Also classifies applicable emission reduction techniques and presents new economical evaluation method for each techniques. We ultimately developed VEER(VOCs Emission Estimation and Reduction) software, which is backed by above mentioned model, emission source DB, Chemical properties DB, meteorological DB, and emission factor DB. With VEER, users in enterprise, central government and local self-governing body can get reliable emission results easily, and choose suitable emission reduction techniques.

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Development of Volatile Organic Compound Pretreatment Device for Removing Exhaust Gas from Display Manufacturing Process (Display 제조공정 배출가스 처리를 위한 휘발성 유기화합물 전처리 장치 개발)

  • Moon, Gi-Hak;Kim, Jae-Yong
    • Applied Chemistry for Engineering
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    • v.30 no.5
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    • pp.523-529
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    • 2019
  • In this study, we investigated the pretreatment technologies of volatile organic compounds (VOCs) which is a problem as the semiconductor and display industry develops recently. The conventional concentrator used in the direct combustion system, is easily contaminated by the exhaust gas in the manufacturing process of the display, resulting in the low treatment efficiency of generated VOCs. Physical/Chemical analyses of the exhaust gas showed high boiling point and viscosity in addition to a large amount of molecular weight alcohols and oil components. In this study, we tried to treat degrading materials by using the heat exchanger in a pretreatment facility and some materials degrading the concentrator were condensed more than 90%. In addition, it was also confirmed that an auxiliary device of the grease filter could remove the redispersion polymer oil from the heat exchanger.

A Study on Adsorption of Volatile Organic Compound by Activated Carbon Fiber Coated with Dielectric Heating Element and Desorption by Applying Microwave (유전가열물질을 코팅한 활성탄소섬유의 휘발성 유기화합물 흡착 및 마이크로파 인가에 의한 탈착 연구)

  • Kim, Sang-Guk;Chang, Ye-Rim
    • Journal of Korean Society for Atmospheric Environment
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    • v.25 no.2
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    • pp.122-132
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    • 2009
  • Adsorption of toluene by activated carbon fiber (ACF) coated with dielectric heating element and desorption by applying microwave were investigated. In order to prepare adsorbent so that VOC can be desorbed by microwave heating, fine dielectric heating element with nano size was coated on the surface of the ACF using hybrid binder. Eight adsorbents (ACF-DHE, Activated Carbon Fiber coated with Dielectric Heating Element) were prepared with different amount of dielectric heating element, kinds of hybrid binder, and solvent. In order to investigate adsorption characteristics, BET surface area, pore volume, and average pore size were measured for each adsorbent including ACF. Breakthrough experiments with toluene concentration, flow rate, bed length using fixed bed reactor were performed to investigate adsorbality of adsorbent, and results were compared with that of the ACF. Desorption reactor was constructed with modified microwave oven to investigate heating effect on ACF-DHE by applying microwave power. Each adsorbent saturated with toluene were put into desorption reactor. Composition of desorbed gas generated by applying controlled microwave power to reactor was measured. Up to now, hot air desorption method has been used. Experimental results showed that desorption method with new adsorbent prepared by coating dielectric heating element on ACF can be used for industrial application.

The Variation of Offset Ink Properties according to the Vegetable Oil Estersr (Vegetable Oil Esters에 따른 Offset 잉크의 물성 변화에 관한 연구)

  • Park, Jung-Min;Kim, Sung-Bin
    • Journal of the Korean Graphic Arts Communication Society
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    • v.30 no.1
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    • pp.1-19
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    • 2012
  • According as gradually increasing the demand for eco-friendly at the printing process, it has been progressed fairly development. Especially, the inks are used by soy oil beginning of ink industry for preventing environment, it is possible to make eco-friendly inks with vegetable ester. So it is not necessary to use petroleum-based solvents at all for preventing environment. These eco-friendly inks have a benefits they are able to use the renewable resource. But basically vegetable oils have that reduce the VOC(Volatile Organic Compound) and high viscosity, high solubility properties. So if the vegetable oils use in the ink, set off problem occur on the paper because of slow drying time. In case of vegetable ester, it has similar the molecular weight and kinetic viscosity with hydrocarbon solvent, it is able to control the power of dilution about the resin. So, it has benefit that solve the problem of the existing eco-friendly inks. In this study, different types of ester were made by six types of vegetable oils and used ester in the varnishes and inks properties are comparison with hydrocarbon solvent based ink. By considering the intrinsic properties of vegetable oil, ester used to analyze the changes in ink properties, using ester varnish is applied to study the rheology characteristics and emulsification with inks.

A Study on Thermal Conduction in Oyster Shell Incorporating Gypsum Objects (굴패각 배합 석고재료의 열전도 특성 연구)

  • Kwon, Sung-Hyun;Cho, Daechul
    • Clean Technology
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    • v.19 no.2
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    • pp.90-94
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    • 2013
  • We investigated one-dimensional thermal conduction for gypsum objects incorporating oyster shell powder. We presumed that according to the portion of oyster shell in the hybrid structure conductive characteristics of that would also change as some physicochemical properties such as volatile organic compound (VOC) adsorption were found to be changed considerably. Based on Fourier's 2nd law of heat conduction an analytical analysis in a flat slab (one axis perpendicular to an infinite plane) was performed. We found that composition of oyster shell and conduction-related coefficients and parameters could greatly influence on the thermal profile of that conduction, and some model experiments also served for it in the affirmative.

Formulation and Evaluation of Glass-Ceramic Ink for Digital Ink-jet Printing (디지털 프린팅용 글래스-세라믹 복합 잉크 제조 및 특성 평가)

  • Kwon, Jong-Woo;Lee, Jong-Heun;Hwang, Kwang-Taek;Kim, Jin-Ho;Han, Kyu-Sung
    • Korean Journal of Materials Research
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    • v.27 no.11
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    • pp.583-589
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    • 2017
  • Ceramic ink-jet printing has become a widespread technology in ceramic tile and ceramicware industries, due to its capability of manufacturing products on demand with various designs. Generally, thermally stable ceramic inks of digital primary colors(cyan, magenta, yellow, black) are required for ink-jet printing of full color image on ceramic tile. Here, we synthesized an aqueous glass-ceramic ink, which is free of Volatile organic compound(VOC) evolution, and investigated its inkjet printability. $CoAl_2O_4$ inorganic pigment and glass frit were dispersed in aqueous solution, and rheological behavior was optimized. The formulated glass-ceramic ink was suitably jetted as single sphere-shaped droplets without satellite drops. After ink-jet printing and firing processes, the printed glass-ceramic ink pattern on glazed ceramic tile was stably maintained without ink spreading phenomena and showed an improved scratch resistance.

Application of the Eco-friendly Materials for the Interior Design (친환경 실내 디자인 소재 개발 활용 방안)

  • Sung, Nak-Bong
    • The Journal of the Korea Contents Association
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    • v.11 no.10
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    • pp.209-216
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    • 2011
  • This paper, the shielding material is suggested using by the korean paper, lacquer, and charcoal those can be used more eco-friendly materials for the interior design. Also, it is designed the image-wall for improving of the electromagnetic shielding and the beauty. Suggested shielding material is manufactured with the thickness of 2 mm by the printing method of the lacquer and charcoal on the korean paper. This material has the shielding effectiveness over 95% until 2 GHz. The application for the interior design using more eco-friendly material can be reduced the effect of electromagnetic wave and the chemical substances like as the formaldehyde and the volatile organic compound (VOC).