This study was performed to investigate the contamination characteristics of water in the scrubber with the aim of stably maintaining the scrubber, and to comprehend the removal characteristics of sulfur compounds, which are odorous substances, when microbubbles were supplied to the circulation water tank of a scrubber. The results of our analysis found that 63 kinds of gas compounds were detected from the scrubber, and thus it could be determined that Sulfur compounds, Ammonia (base compounds), Aldehyde compounds, and Pyrazine compounds were generated from the process for the production of sesame oil. About 93% of ammonia was removed in the scrubber; however, it was hard to remove Sulfur compounds, Aldehyde compounds and Pyrazine compounds using the scrubber. The efficiency of hydrogen sulfide, methylmercaptan and dimethydisulfide removal using only water in the scrubber was 79.8%, 79.7%, and 81.0%, respectively. However, when microbubbles were supplied to the scrubber, the removal efficiency for each was 83.7%, 91.1%, and 96.1%, respectively. Therefore, it was confirmed that the efficiency of sulfur compound removal was improved by supplying microbubbles to the circulation water tank of the scrubber. In addition, the amount of removal that could be achieved by using microbubbles was 1.05- 1.19 times higher than using only water. In terms of supplying microbubbles, it was confirmed that the saturation time required to absorb odorous gases was about 2.8 times longer than the time without microbubbles because the OH radicals generated when the microbubbles are shrinking partly oxidized organic matter. When there was no chemical in the circulation water tank, the conductivity and CODCr concentration were highly correlated. Therefore the system, which can replace circulation water by using real-time conductivity data, can be considered to be applicable.

This study aims to evaluate the relationship with the concentration and odor intensity using the odor sensory method for 4 types of sulfur compounds, ammonia, and trimethylamine. For the measurement, 13 panelists were selected by several criteria through a panel test. Panelists chosen for their closely similar sensitivities provide more reproducible values. The estimation showed that the correlation of the concentration with odor intensity for the 6 compounds can be reasonably expressed by the equation I=Aㆍlog C+B (I: Odor Intensity, C: material concentration, A: material constant, B: constant). 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 on site boundary in operation, as well as a correlation between the concentration and odor intensity for the designated foul odor substances, and their characteristics.

This study aims to evaluate the relationship with the concentration and dilution factor using the Air Dilution Olfactory Method, which is suggested in the Standard Method of Odor Compounds, by measuring dilution factor for 4 types of sulfur compounds, ammonia, and trimethylamine. For the measurement, 13 panelists were selected by several criteria through a panel test. Panelists chosen for their closely similar sensitiviyies provide more reproducible values. The estimation showed that the correlation of the concentration with dilution factor for the 6 compounds can be reasonably expressed by the equation logC=AfㆍlogD+F (Af: material costant, F: constant). 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 on site boundary in operation, as well as a correlation between the concentration and dilution factor for the designated foul odor substances, and their characteristics.

In this study, the emission characteristics of landfill gas (LFG) were investigated with respect to reduced sulfur compounds (RSC) and elemental mercury. To describe their emission characteristics accurately, methane and dilution-to-threshold (D/T) ratio were also analyzed as reference. LFG samples were collected in three different pathways; (1) old landfill (LF), (2) new LF, and (3) composite from both LFs. Differences in RSC concentrations between two LFG samples were relatively insignificant in the case of H2S, CS2, and SO2. On the other hand, a significant reduction in CH3SH and DMS concentrations was observed from old landfill. The concentration data of Hg and methane showed a similar spatial trend between new and old LF, as seen from RSC. In general, a large quantity of trace gas pollutants came out from new rather than old LF. The correlation analysis indicated strong relationship between most sulfur compounds, while it is not for other components including Hg, CH4, and D/T ratio. It suggests that trace composition of LFG comply well with the maturity of landfill.

In this study, the emission characteristics of reduced sulfur compounds (RSC) including H₂S, CH₃SH, DMS and DMDS released via cooking were investigated. Cooking smoke samples were produced by two different cooking methods (fry and steam) and analyzed for direct comparison between three types of food (cabbage, clam and coffee bean). In general, a large quantity of RSC came out from fried foods relative to steamed foods. The conversion of RSC concentration to odor intensity (OI) showed OI values in the range of 2.54∼6.41 for fried foods and 1.23∼3.68 for steamed foods. The results of this study suggest that we need to develop and establish environmentally friendly cooking methods.

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 4 types of sulfur 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 4 sulfur 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.

Semi-automatic cryogenic-preconcentrator is constructed with time controlling function in preconcentration and desorption stage. GC-FPD and cryogenic-preconcentrator were to analyze gaseous sulfur compounds (hydrogen sulfide, methanethiol, dimethyl sulfide, and dimethyl disulfide) in ppbv level. The objective of this study was to offer reliable methods for sulfur gas analysis in all procedures (keeping, concentration, desorption, and detection). The cryo-concentrator was able to concentrate 4 L gas sample of 40 % relative humidity. The recovery rate of the system was in the range of 92~100 % at 30 seconds of pre-heating time, and method detection limits were shown up 0.16~0.20 ng which is able to quantify 1 ppbv level with 0.5 L gas sample. The storage time of 5 ppbv sample in polyethylene bag led to serious loss (e.g; H₂S: loss of 30% after storage 3 days). It was estimated that the analytical bias was affected more sensitively by storage time after sampling than by cryo-injection procedures in the analysis of hydrogen sulfide and methanethiol.

대기환경 중에 존재하는 여러 가지 가스상 성분들을 채취 및 이송시키고자 할 때, 다양한 종류의 튜빙을 사용한다. 이와 같은 튜빙의 사용과 연계된 여러 가지 오차를 분석하기 위해, 악취황 성분들을 이용한 비교분석을 시도하였다. 이를 위해 45cm 길이로 6가지 재질의 튜빙을 선택하여, 각 튜빙별 손실특성을 평가하고자 하였다. 이를 위해, 10ppb 농도의 표준시료를 준비하고, 이를 튜빙에 통과시켜 준 후, 튜빙을 통과한 전후에 검출되는 농도를 비교하는 방식으로 손실율을 산출하였다. 이러한 비교의 목적상, 환원황 성분에 가장 우수한 회수율을 보이는 Silco Steel 튜빙을 통과한 결과를 기준 검량선으로 설정하고 여타 튜빙에 대한 회수율을 비교하였다. 그 결과 Teflon 튜빙에서는 4가지 황화합물 모두 90% 이상의 높은 회수율을 보일 정도로 양호한 결과를 보였다. 이에 비해 스테인레스나 브래스 재질의 경우, 저분자 황성분에 해당하는 H2S, CH3SH에서 상당한 손실을 보였다. 반면 실리콘 튜빙의 경우, 고분자 성분에 해당하는 DMS, DMDS에서 큰 손실을 보였다. 결과적으로 황화합물의 종류나 튜빙의 재질에 따라 RSC의 손실은 다양한 형태로 나타나는 것을 확인할 수 있다.

2001년 봄철 기간을 택하여 한반도에서 비교적 청정한 대기질을 유지하는 것으로 알려진 제주도를 거점으로 DMS와 CS2 농도분포를 시간대 별로 관측하고 이를 조절하는 요인들에 대한 세부적인 분석을 수행하였다. 본 연구의 관측 결과에 따르면, 전체 기간동안 관측된 DMS와 CS2 농도분포는 시간대 별로 세가지 경향성을 뚜렷하게 보여 주었다. 실험의 전 · 후반부에는 양성분의 농도증감 경향이 거의 비슷하게 나타난데 반해, 중반부에는 증감이 반대로 나타나는 경향성이 뚜렷하게 확인 되었다. 그리고 또한 특이한 현상은 전반기에 CS2의 고농도가 나타난 반면, 후반기에는 DMS의농도가 50%가까이 증가하는 것으로 나타났다. 후반기 기간중의 공기궤가 한반도의 내륙지역에 상당 수준 정체하였다가 제주로 유입되었다는 점을 감안하면, 다른 기간대에 비해 상대적으로 높은 DMS의 농도는 대단히 예외적인 경향으로 간주할 수 있을 것이다. 본 연구의 결과에 따르면 지리적 특성에도 불구하고, 제주 지역에서 관측한 DMS의 농도분포는 단순히 해양환경으로부터 파생되는 요인외에도 여러 가지 복잡한 인자들에 의하여 조절되고 있음을 확인 할 수 있다.

The effect of gypsum application was tested on dry matter yield, sulfur uptaken, composition of Ritrogen compound and sulhr compound and sulfur balance in mixed pasture. Total dry matter yields and sulfur uptake by grasses increased with the increasing of

본 연구에서는 국내산 Allium속의 휘발성 유기성분과 생리적 유용성을 지닌 함유황 유기화합물을 비교 분석하였다. 마늘, 양파 및 대파를 동결 건조하여 SDE 추출법을 이용하였으며 휘발성 유기성분을 추출하고 GC/MS로 분석하였다. 건마늘의 주요 향기성분은 diallyl disulfide, diallyl trisulfide, allyl methyl trisulfide, allyl methyl disulfide 등이었으며, 건양파에서는 diprop