간행물
한국냄새환경학회지 KCI 등재 Journal of Korean Society of Odor Research and Engineering
- 발행기관 한국냄새환경학회
- 자료유형 학술지
- 간기 계간
- ISSN 1598-6616 (Print)2287-6731 (Online)
- 수록기간 2002 ~ 2013
- 주제분류 공학 > 환경공학 공학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제9권 제3호 (2010년 9월) 6건
1.
2010.09
구독 인증기관 무료, 개인회원 유료
In this study, calibration characteristics of odorous amine compounds were investigated by gas chromatography (GC)-nitrogen phosphorous detector (NPD). To this end, three different amine compounds (methyl amine (MTA), dimethyl amine (DMA), and trimethyl amine (TMA)) were analyzed in a series of calibration experiments. As the first step, the liquid phase standards of these amines were calibrated at 5 concentration levels with the fixed standard volume (FSV) method. The results showed that response factors of three amines were in the order of TMA ＞ DMA ＞ MTA with their correlation coefficients (r) above 0.97. The results of FSV calibration also indicated that the analytical sensitivity of amines increased with reducing injection volume due to the decrease in matrix effect. However, when these compounds were calibrated by the fixed standard concentration (FSC) method, the results were not stable under most circumstances. In addition, the reliability of internal calibration approach was also tested using pyridine, nitrobenzene, and nicotine. When pyridine was used as internal standard of these amines, analytical reproducibility of amines was improved greatly compared to external calibration results (e.g., an improvement of 75% for DMA).
4,000원
2.
2010.09
구독 인증기관 무료, 개인회원 유료
This study was carried out to find the optimal methods in odor dispersion modeling. The CALMET and CALPUFF recommended by US EPA were used in the study. The accuracy of 3 dimensional meteorological field was one of the important parameters in the modeling, To understand the sensitivity of CALMET according to meteorological input data, four Cases were tested and compared with the measurements. The four Cases with various input data were followed : Case 1 was surface and upper measured data, Case 2 was MM5 data only, Case 3 was surface weather station and MM5 data, Case 4 was surface weather station, upper-air weather station and MM5 data. The comparisons of wind speeds, wind direction and temperatures by CALMET model with observations under various input data showed that Case 4 was more accurate than the other Cases. The results of CALPUFF dispersion modeling were compared with odor complains data and they showed that there were similar patterns even if some discrepancies existed. CALPUFF dispersion modeling was also compared with odor monitoring station data, and there was a good agreement in the threshold odor concentrations. In order to get more accurate result for odor modeling, we need following additional measures: First, fine tuning of odor emission data with the consideration of variations of emission fate according to operation hour of the odor emitting facilities. Second, construction of continuous monitoring system(on-line GC, odor a sensor etc.) was necessary to monitor the odor compound concentrations.
4,000원
3.
2010.09
구독 인증기관 무료, 개인회원 유료
Desorption reaction characteristics of the used activated carbons collected from manufacture of rubber and plastics products in Shiwha/Banwal industrial complex were investigated. Desorption reactions were analyzed based on the data obtained from a thermogravimetric analyzer. Activation energies and reaction orders for desorption reaction characteristics of the used activated carbons were estimated by employing the Friedman method and the Freeman-Carroll method. It was found that the activation energies were 24.7∼41.3 kJ/㏖ in the Friedman method and 13.9∼24.4 kJ/㏖ in the Freeman-carroll method, and reaction orders were 0.3∼1.4.
4,000원
4.
2010.09
구독 인증기관 무료, 개인회원 유료
This study aims to understand the correlation between odor intensity and dilution factor using the Air Dilution Olfactory Method, which is suggested in the Standard method of Odor Compounds, by measuring odor intensity and dilution factor for 5 types of carbonyl compounds. For the measurement, 13 panel members were selected through a panel test, and odor intensity and dilution factor by substance produced from the selected panel were estimated. The estimation showed that the correlation of odor intensity with dilution factor for the 5 carbonyl compounds can be reasonably expressed by the equation [I = AㆍLog D + 0.5]. The result of this study is suggested to be used as a base data for research on measures to improve the regulation standards for complex odor concentration at a boundary site in operation, as well as a correlation between odor intensity, concentration and dilution factor for the designated odor substances, and their characteristics.
4,000원
5.
2010.09
구독 인증기관 무료, 개인회원 유료
In this study fuji apples variation were measured during gradual decay, stored 5 weeks at 25℃. A aluminum and glass emission chamber were used for visual inspection throughout the experiment. The sampling was performed by using polyester aluminum bags and Tenax-TA tubes. In addition, GC/FID/O and TD-GC/MS were used for monitoring the compound of odor and its density variation during each storing period. By visual inspection, we found that the apples started decaying in 4th week and were rotten to core in 5th week. In contrast, individual odor analysis shows that the apples flavor reduced gradually and dramatically increased with the odor of old apples and apple cider in 3rd week, which was before visual identification of decay. This phenomenon was due to ongoing internal decay. ethyl 2-methylbutanoate, ethyl propanoate and 2-methylbutyl acetate were the major factor of this off-flavor in this period (3rd week). After visible observation of decay (4th week and 5th week), ethyl acetate, ethyl butanoate and hexyl ethanoate were emitted, which smells bitter or sour. Above 6 odors are closely related with apples decay, and measurement of smell or density of these odors could easily check the apples status. We expect measuring composition variation can be applied for food storage and management cause of not only internal change checking but also monitoring pre-decay phenomenon.
4,000원
6.
2010.09
구독 인증기관 무료, 개인회원 유료
Most wastewater treatment plants are facing odor and sludge disposal problems. In this lab-scale study, odor and sludge from wastewater treatment processes were treated using a combined non-thermal plasma and sludge reactor. The hydrogen sulfide concentration introduced to the reactor was varied at 10, 20, and 50 ppm, and its removal efficiency and system performance were determined. Ozone was produced by the plasma reaction at a concentration of 200 ppm under the given condition. 80% of the hydrogen sulfide was removed regardless of its introduced concentration. In addition, due to the ozone carried over to the sludge reactor, the organic constituents in the waste sludge in terms of TCOD decreased by 30%. The ion concentrations of HS- and SO₄²⁻ in the sludge increased during the four hour experimental period. As a result, the plasma oxidation system can treat waste sludge effectively for the simultaneous reduction of sludge volume and odor.
4,000원
