• Journal of Korean Society for Atmospheric Environment
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• 제18권E3호
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• pp.165-174
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• 2002

A dual -column biofilter system with two different composts was used to investigate the macro-kinetics of dim-ethyl disulfide (DMDS) degradation. The biofilter columns were filled with compost mixtures up to one meter, The gas How rate and DMDS concentration to the biofilters were varied to study their effect on the removal characteris-tics of DMDS. It was found that the biodegradation of DMDS was governed by zero-order reaction -limited macro-kinetics for inlet DMDS concentrations between 10 and 55 ppmv. The overall average zero-order kinetic coeffi-cient for DMDS removal by compost was 0.50 ($\pm$0.1) ppm/sec for both compost mixtures studied. Variations in individual kinetic coefficients were observed due to varying environmental conditions, such as pH and temperature. The kinetic coefficients determined are specific to the system discussed in this work. During high acidity conditions in the filter beds, methyl mercaptan (MM) was observed in the gas samples collected. Appearance of MM was pro-bably due to decreased microbial activity in the lower portions of the biofilter. Considering the neutral pH range required and the presence of methyl mercaptan, it is likely that the microorganisms present in the biofilters used in this research are similar to the T. thioparus (strain E6) species.

• 환경영향평가
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• 제21권3호
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• pp.353-365
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• 2012

This study is understanding characteristics and analyzing contributions of the odor causing compounds of complex-odor & major specified odor materials, and contribution analysis, caused pre-treatment facilities(input and storage) and post-treatment facilities(heating and drying). The target of this study is feeds-production-facilities, located in Seoul. The averaged complex-odor compounds on the boundary line is 21 times higher, and it is 15 times higher than emission standards. In cracking&collection(pre-treatment facilities), the concentration of compounds is 4,881 times, 2,080 times in drying, and 1,442 times in putting&storing facilities. Ammonia occupies the largest portion of the results of monitoring specified odor compounds in input&storage facilities, followed Acetaldehyde > Hydrogen sulfide > Methyl mercaptan. In cracking&collection, Ammonia also occupies most of odor compounds, followed Methyl mercaptan > Acetaldehyde > Dimethyl disulfide > Dimethyl sulfide > Hydrogen sulfide. Acetaldehyde > Methyl mercaptan in drying facilities. On the boundary line, however, the concentration of specified odor compounds stays below emission standards. The result of contribution analysis is that methyl mercaptan has the highest contribution in input & storage, as well as cracking&collection facilities, followed Acetaldehyde > Hydrogen sulfide > Dimethyl sulfide > Dimethyl disulfide. In the drying facilities, the contribution shows Methyl mercaptan > Acetaldehyde > i-Valeraldehyde and Butyraldehyde. Therefore, to decrease odor in foodwaste treatment facilities, proper prevention facilities need to be installed and operated, according to characteristics of individual odor compounds, based on monitored data.

• 한국결정성장학회지
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• 제20권5호
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• pp.221-226
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• 2010

메칠멜캅탄($CH_3SH$) 가스를 검출하는 수정진동자(QCM) 가스센서를 QCM의 전극에 $TiO_2$ 나노입자와 전해질 폴리머를 증착하여 제조하였다. LBL-SA법에 의해 제조된 $TiO_2$/PSS 박막은 높은 비표면적을 나타내었고, 가스센서의 감도를 증가시켰다. 1.0 ppm의 농도를 갖는 메칠멜캅탄에 노출된 TEA 혹은 $TiO_2$/PSS 막이 증착된 QCM의 주파수 변이는 각각 약 9 Hz, 2 Hz 였다. ($TiO_2$/PSS) 박막의 증착수가 늘어남에 따라 제조된 박막의 비표면적이 증가하게 되어 QCM 센서의 주파수 변이도 점차적으로 증가하였다. 추가적으로 메칠멜캅탄 가스의 농도가 0.5 ppm에서 2.0 ppm으로 높아짐에 따라 QCM 센서의 주파수 변화도 증가되었다. 본 연구에서는, ($TiO_2$/PSS) 박막이 증착된 QCM 센서의 표면구조의 변화와 센서 특성을 측정하였다.

• 월간산업보건
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• 통권147호
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• pp.26-27
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• 2000

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2004년도 봄 학술발표회 발표논문집
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• pp.227-229
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• 2004

• Environmental Engineering Research
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• 제8권5호
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• pp.252-258
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• 2003

• 한국환경과학회지
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• 제24권3호
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• pp.317-322
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• 2015

The photocatalytic decomposition characteristics of toluene, acetone, and methyl mercaptan (MM) by UV reactor installed with $TiO_2$-coated perforated plane were studied. The removal efficiency of single toluene, acetone, and MM vapor was increased with increasing oxygen concentration, but decreased with increasing inlet concentration. Elimination capacity of single toluene, acetone, and MM vapor was obtained to be $628g/m^3{\cdot}day$, $1,041g/m^3{\cdot}day$, and $2,158g/m^3{\cdot}day$, respectively. Also, the photocatalytic decomposition of binary vapor consisted of toluene and acetone, toluene and MM, acetone and MM were observed. Elimination capacity of toluene mixed with acetone, toluene mixed with MM, acetone mixed with toluene, acetone mixed with MM, MM mixed with toluene, and MM mixed with acetone was $327g/m^3{\cdot}day$, $512g/m^3{\cdot}day$, $128g/m^3{\cdot}day$, $266g/m^3{\cdot}day$, $785g/m^3{\cdot}day$ and $883g/m^3{\cdot}day$, respectively. The inhibitory effect of acetone was higher than MM in photocatalytic decomposition of toluene, the inhibitory effect of toluene was higher than MM photocatalytic decomposition of acetone, and the inhibitory effect of toluene was higher than acetone in photocatalytic decomposition of MM.

• 한국식품과학회지
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• 제34권6호
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• pp.1123-1126
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• 2002

김치를 $25^{\circ}C$에서 4일간 숙성시킨 후, pH와 관능성을 관찰하고 몇가지 주요한 휘발성냄새성분의 변화를 관찰하였다. pH는 가열에 의하여 거의 변화가 없었다. 전반적인 기호도는 가열된 시료, 특히 40분 가열시료의 기호도수치가 높았으며 3시료 사이에 유의적인 차이를 보였다(p<0.05). 산미, 맛, 냄새, 조직감의 경우도 전반적인 기호도와 유사한 경향을 보였으나, 형태의 경우는 3시료 사이에 차이가 없었다. 휘발성 냄새성분의 결과를 보면 reference(비가열시료)는 allyl mercaptan, methyl allyl sulfide, dimethyl disulfide, diallyl sulfide, diallyl disulfide와 같은 5종의 황함유성분과 ethanol이 검출되었는데, $100^{\circ}C/10$분시료는 ethanol과 methyl allyl sulfide만 검출되고 그 함량도 reference에 비하여 현저하게 감소하였으며, $100^{\circ}C/40$분 시료는 $100^{\circ}C/10$분 시료와 비교하여 ethanol의 함량은 현저히 감소하고 methyl allyl sulfide의 함량은 거의 변화가 없었다.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2009년도 추계학술대회 논문집
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• pp.480-481
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• 2009

• 한국식품영양과학회지
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• 제36권12호
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• pp.1637-1642
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• 2007

생마늘과 열처리에 따른 마늘의 향기 특성과 향기추출물의 항산화활성을 확인하고자 국내산 한지형 마늘 3종(단양, 서산, 의성마늘)과 난지형 마늘 3종(남해, 남도, 대서마늘), 중국산 마늘에 대하여 simultaneous distillation and extraction(SDE) 방법으로 향기 성분을 추출하여 GC/MS로 동정하고 항산화활성을 측정하였다. 생마늘의 주요 향기성분은 allyl methyl sulfide, methyl-2-propenyl disulfide, diallyl disulfide, 2-ethylidene-1,3-dithiane, methyl-2-propenyl trisulfide, di-2-propenyl trisulfide 및 2-vinyl- 4H-1,3-dithiin 등으로 나타났다. 항산화활성이 우수한 것으로 알려진 diallyl disulfide, methyl-2-propenyl trisulfide 및 di-2-propenyl trisulfide 등은 중국산 마늘보다 한지형 마늘이 많이 함유하고 있었다. 향기성분은 열처리시 2-propanone, allyl mercaptan, methyl formic acid, 2-methyl butanal 2-methyl thiophene, methyl pyrazine, 2,2-dimethyl-1,3-dithiane 및 2-propenyl propyl disulfide 등이 새롭게 생성되었으며, allyl methyl sulfide, allyl alcohol 및 allyl sulfide 등의 분자량이 작은 화합물의 함량이 증가하였다. 산지별 생마늘의 향기 추출물에 대한 항산화활성은 농도 의존적으로 증가하였으며, 단양, 남해 및 중국산은 각각 20.07, 34.62 및 9.71%의 항산화활성을 나타내었고, 열처리 후에는 각각 79.90, 93.59 및 77.26%로 증가하였다.