Sliding Arc Plasma를 이용한 석유공장에서의 BTX 처리효율에 관한 연구

권우택,권이승,이우식 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.6

This research examines the removal efficiency of benzene, toluene, xylene (BTX) and total volatile organic compounds(TVOCs) by flowing VOCs, which are generated at a petrochemical complex in the Ulsan area, in a sliding arc plasma(SAP) reactor. The SAP reactor process is composed of 5 steps and the analysis was conducted using a BTX detector andTVOC measuring instrument. The removal efficiency of BTX was better at high concentration than at low concentrationand the emitted TVOC concentration increased in later steps of the reactor. In addition, the removal efficiency improved,as the flow velocity increased. The maximum permissible concentration of TVOCs in the first step was about 481 ppmand showed over 94.83% efficiency when it was operated in the 2nd step at concentrations beyond 481 ppm. Therefore,there are many factors for improving the removal efficiency of SAP reactors at low concentration and measures should beprepared according to the application method for the various types of industrial reactors. 본 연구는 울산소재 석유공장의 건조시설에서 발생하는 가스를 스크러버(Scrubber)로 최종 처리하여 배출되는 저 농도의 유해가스와 산 처리 시설에서 발생되는 고 농도로 발생하는 유해가스를 대상으로 연구하였다. 공정별로 벤젠(Benzene), 톨루엔(Toluene), 자일렌(Xylene) 및 총휘발성유기화합물(TVOCs)을 대상으로 측정하였으며 농도 측정은TVOCs 측정기와 GC-MSD를 이용하여 SAP 전 · 후단의 TVOCs와 BTX의 농도를 측정, 분석하여 제거효율을 평가하였고, SAP 반응기는 5 단계로 구성하여 실험을 수행하였다. 슬라이딩 아크 프라즈마(slidind arc plasma) 반응기의 단수별에 따른 TVOCs 농도 변화는 유입 TVOCs 농도의 변화에 따른 처리효율 결과 481 ppm 미만에서 94.83%, 481ppm 이상일 경우에는 1단에서는 89.07% 2단에서는 약 91% 이상으로 처리되는 것을 확인할 수 있었다. 본 연구의 결과는 석유화학공정 및 제조시설에서 SAP 공정을 통한 VOCs 제거에 대한 연구 및 기술개발의 기초가 되어 VOCs의보다 안정적인 처리와 다양한 기술개발에 효과가 있을 것으로 기대해 본다.

Convergence of Consumer Hygiene Awareness on Coffee Smell, Price, and Shops, Customer Satisfaction, and Repurchases

권우택,김영선,권이승 한국유통과학회 2015 유통과학연구 Vol.13 No.12

Purpose – The purpose of this study is to determine consumers’ awareness of hygiene and the perceived risks in the service areas of coffee shops and diners, or simply coffee shops. Research design, data, and methodology – A literature review was conducted on related publications, essays, and periodicals to find correlations among the variables. We developed a research model and hypothesis, and conducted empirical research for statistical data analysis. Results – The results satisfied adequacy standards, with GFI=0.926, AGFI=0.901, RMR=0.020, NFI=0.941, X2=403.197, and p-value=0.120. The results also displayed satisfied adequacy standards for the moderating effects of shop types, with GFI=0.998 (≥0.9 desirable), AGFI=0.998 (≥0.9 desirable), RMR=0.004 (≤0.05 desirable), NFI=0.999 (≥0.9 desirable), X2=1.572, and p-value=0.814 (≥0.05 desirable). Conclusions – A higher consumer hygienic awareness results in a better brand image. Moreover, greater perceived risk results in a worse brand image. Perceived risk is a vital determinant of brand image and it deeply influences customers’ decisions to visit. Therefore, perceived risk is a vital determinant of forming a brand image and must be incorporated when devising strategies.

The Development of New Cost-Effective Optimization Technology for OLED Market Entry

권우택,Lee-Seung Kwon,이우식 한국유통과학회 2019 유통과학연구 Vol.17 No.4

Purpose - This study aims to improve the distribution structure of the OLED market and develop cost-effective optimization techniques. Specifically, it is a study on the optimization of ferric chloride to improve the etch of SUS MASK for OLED. Research design, data, and methodology - Applying the optimal conditions of the experiment, the final confirmation was evaluated for improvement by the Process Capability Index (Cpk). It is possible to derive social performance such as improvement of precision of SUS MASK manufacturing, economic performance such as defect rate, reduction of waste generation and treatment cost, technological achievement such as SUS MASK production technology, improvement of profit structure of technology development and process improvement do. Results - The improvement of the Cpk before the improvement was made was confirmed to be 0.57% with a defect estimate of 25.07% with a failure estimate of 0.57% after the improvement, and 8.84% with a failure estimate of 0.57% level after the improvement. Conclusions - If the conclusions obtained from the specimen experiment are applied to the manufacturing process of SUS MASK, it will be possible to expect excellent cost-effective competitiveness due to the improvement of precision and reduction of defect rate to enhance the OLED market penetration.

Economical Ventilation Effectiveness to Reduce Hazardous Chemical Emissions for a Nail-Salon Worker

권우택,정민재,이우식,Lee-Seung Kwon,소영진 한국유통과학회 2019 유통과학연구 Vol.17 No.7

Purpose – The purpose of this study is to investigate economical ventilation effectiveness to reduce hazardous materials exposure and damage of workers by analyzing exposure amount of noxious substances under various ventilation conditions of nail salon for indoor environments. Research design, data, and methodology – This study was carried out with cooperation of Nail shop located in SeongNam city to involve an analysis of the environmental impact indoor air quality, pollutant exposure and economical cost-effectiveness in the nail workplace. The hazardous substances were PM-10(Particulate Matter-10㎛), VOCs(Volatile Organic Compounds) and Formaldehyde, which are the major materials of nail workplace. Results – PM-10 is reduced by about 60% with air cleaner, forced artificial ventilation by 32%, and natural ventilation by about 12%. TVOCs and Formaldehyde showed similar efficiency (80~100%) after natural ventilation and ventilation after 60 minutes. The removal efficiencies of VOCs and formaldehyde were similar to those of natural ventilation and mechanical ventilation system. However, in case of dust, natural ventilation was reduced by artificial ventilation system due to inflow of external dust during natural ventilation. Conclusions – If the pollution degree of outdoor air is not high, air volume is high, and natural ventilation is performed when the air conditioning and heating system is not operated. Even at the end of the work, it keeps operating for 60 minutes to remove the pollutants generated. Results of this analysis demonstrated that the worker environment can be improved by adopting institutional legislation and guidelines for ventilation.

新興 水源池의 富營養化 豫測

권우택 서울保健大學 1991 論文集 Vol.11 No.1

Enrichment of a water body by the input of organic material, nitrates and phosphates. This may happen naturally but is often a from of pollution. Eutrophication leads to an increase in the growth of aquatic plants and often to algal blooms. The algal growth produce toxins which kill fishes, or cause deoxygenation of the water In extreme causes this results in the death of most of the aquatic animals and higher plants. In this paper, the field survey was carried out to study in the Shin Hung reservoir once a month in the period of three months from March till May, 1990 the results could be summarized as follows. 1. The Shin Hung reservoir influent water was very polluted, during the survey period The average water temperature is 15.3℃ The average pH is 7.41 The average DO is 8.96㎎/l The average transparency is 1.31m The average T-P is 0.139㎎/l The average T-N is 4.41㎎/l The average Chl-a is 14.4㎎/㎥ 2. A simulation of the eutrophication of Shin Hung reservoir based on total phosphate load by carlson trophic state index in 1990; TSI(Chl)54.28, TSI(Sec) 50.46, TSI(T-P) 70.15, in 1995: TSI(Chl) 55.86, TSI(Sec) 51.71 TSI(T-P) 72.43 3. Preventing the eutrophication by aluminum sulfate and hypolimnetic aeration were reasonable method to restore the entrophic state of Shin Hung reservoir.

복합악취 숙련도 평가를 위한 시험용 시료로서 현장시료의 타당성과 이를 이용한 숙련도 평가

권우택,김선태,이석준,홍석영,김명옥,정인영,한진석,류희욱 한국냄새환경학회 2013 실내환경 및 냄새 학회지 Vol.12 No.3

본 연구에서는 악취숙련도 시험을 위한 PTM 물질로 현장시료의 적용가능성을 평가하기 위하여 하수처리장에 채취한 현장시료의 안정성과 채취 균질성을 조사하였다. 또한 현장시료를 PTM으로 사용하여 71개 악취검사기관의 공기희석관능법의 숙련도 시험을 실시하였다. 다양한 설정값(참여기관 또는 기준기관의 악취지수 평균값이나 중위수)를 기준으로 3가지 Z-score 평가법(표준편차 이용한 Z-score, Robust 표준편차를 이용한 Z-score, 목표표준편차를 이용한 Z-score)으로 숙련도의 통계적 분석을 하였다. 하수처리장 농축조에서 채취한 현장시료는 2일 동안 희석배수의 변화 없이 안정적이었고, 참여기관을 4 그룹으로 나누어 순차적으로 채취한 현장시료가 균질한 것으로 평가되었다. 이는 현장악취시료가 악취 숙련도 평가를 위한 PTM 물질로 적용 가능함을 의미한다. 숙련도 시험결과의 통계적 분석을 통해 참여기관의 숙련도 만족비율은 Z-score 평가법이나 설정값의 기준(참여기관 또는 참고기관으로 선택한 3개 대학의 악취지수 평균값이나 중위수) 보다는 목표표준편차(S*ref)값에 의존하였다. 숙련도 만족비율은 S*ref 값이 증가함에 따라 증가하였으며, PTM 시료의 분석결과에 대한 변동계수(CV) 0.13에 해당하는 목표표준편차값에서 숙련도 만족비율은 약 93∼96% 수준이었다. This study was carried out to provide the stability and the feasibility of field odor samples as proficiency testing materials (PTMs) for air dilution olfactory method. Seven-one olfactometry laboratories participated in the proficiency testing. Interlaboratory comparison was carried out by using a field odor samples taken from a sewage thickener as PTMs. Statistics for quantitative results were calculated using three Z-score methods (standard deviation Z-score, Robust Z-score, target standard deviation Z-score) based on either average or median for the participants and three-reference laboratories results. The dilution to threshold of the field samples was constant for 2 days. The difference of dilution to threshold between the samples taken by all of participants was not statistically significant. It means that the field odor sample is feasible as one of PTMs. Satisfactory performance of participants depend on target standard deviation (S*ref) rather than on Z-scores and the creteria of assigned values such as median and average. The satisfactory performance increased with increasin S*ref, and It was 93-96% of participants at a coefficient of variation of .0.13.

A Study on the Actual Condition of Microplastic Contamination in Mackerel

권우택,김귀성,이우식,권이승,나영아 (사)한국조리학회 2018 한국조리학회지 Vol.24 No.2

The purpose of this study is to investigate the contamination level of micro plastics in Korean mackerel and to investigate the detection method of micro plastics in fish. This study analyzed the detection and composition of micro plastics using natural mackerel and wild mackerel. 30% hydrogen peroxide and surfactant were added to GF/C filter paper in order to detect micro plastics in the sea. If micro plastics are exposed to the ocean for a long time, accumulation of heavy metals in the water will make pollutant bioaccumulation more serious. Microscopic consequences The risk to human health of plastics has already been studied by many researchers and the risks to human health already caused by marine microorganisms and zooplankton are becoming clear. The conclusion of this study is that there is a difference between the length and height of the mackerel when it is cooked from the standpoint of food in terms of practical implications. The conclusion of this study is that the probability of micro-plastic-contaminated mackerel to reach and be consumed by end-consumers is low in academic implications. Residual contaminants adsorbed on micro plastics are absorbed by digestive organs and cause disruption, and further research on micro plastics is needed in the future.

시멘트산업에서의 녹색기술

권우택,김영희,김수룡 한국세라믹학회 2011 세라미스트 Vol.14 No.2

城南市 大氣浮遊粉塵 中 重金屬의 季節別, 粒徑別 特性

권우택,유영식,최한영 서울보건대학 1995 서울보건대학 부설 한국보건과학연구소 논문집 Vol.1 No.1

Sungnam city, as a major satellite town, is located in the southeast of Seoul. Atmospheric conditions are so stable that air pollutants from various emissions are tend to resist change because Sungnam city is located in the Namhansansung valley. The industrial distribution of Sungnam city are composed of various manufactories such as foods, fibers, chemicals, machinery and electronics, etc. The heavy metal concentrations and size distribution are the most important parameters influencing among the way in which respirable suspended particulate matter interact with the human respiratory system. Respirable suspended particulate matter was collected on glass fiber filters from April 1993 to February 1994 according to particle size using Andersen sampler during 10 days per month at Sungnam city. 6 heavy metals, Fe, Zn, Ph, Mn, Cu and Cd, were analyzed by particle size with atomic absorption spectrophotometry. The results could be summerized as follows: 1. The annual arithmetic mean concentration of total suspended particulates was 116.3㎍/㎥, seasonal variation was the highest in spring season096.5,ug/m') and the lowest in summer season(72.9 ㎍/㎥) 2. The ratio of airborne particulate concentrations respirable to nonrespirable(Res/NonRes) of annual arithmetic mean value was 5.8 : 1, seasonal variation was highest in the spring season(6.3 : 1) and lowest in the summer season(4.6 : 1). 3. During the spring season the shape of the size distribution was trimodal which showed peaks at 3 size groups, which were below of 0.43㎛, 3.3-4.7㎛, and above of 11.0㎛, respectively. 4. Respirable suspended particulate matter concentrations of Zn, Ph, Cu and Cd were the highest in below of 0.43㎛ as follows; 0.517㎛/㎥, 0.411㎛/㎥, 0.062㎛/㎥ and 0.0310㎛/㎥', respectively, Fe and Mn were the highest in the particle size range of 4.7-7.0㎛ as follows; 2.504㎛/㎥ and 0.095㎛/㎥, respectively. 5. The Ph, Cd, Zn, Cu, Fe and Mn concentrations of annual arithmetic mean value respirable to non- respirable(Res/Non- Res) were 33.65, 19.27, 17.74, 10.54, 3.20 and 5.20, respectively.

성남시 대기부유분진중 호흡성분진에서 중금속의 농도 및 입경분포 ( The Heavy Metals and Dize Distribution of Respirable Suspended Particulate Matter at Sungnam City )

권우택 한국대기환경학회 1994 한국대기환경학회 학술대회논문집 Vol.- No.-