주물공정에서 발생하는 VOCs 및 악취 유발물질에 관한 연구

안문호 ( Wen-hao An ),박성호 ( Sung-ho Park ),신철호 ( Chul-ho Shin ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.3

본 연구는 주물공정에서 배출되는 먼지, 악취물질 및 VOC를 분석하였다. 먼지는 TSP와 PM-10을 중량법으로 측정하였으며, VOC, 알데히드 유도체 및 암모니아는 저온흡착-고온열탈착 GC/MS, HPLC 및 분광광도계를 이용하여 분석하였다. 주형해체와 주물사처리 공정에서의 TSP는 5,000~10,000ug/㎥을 나타내 PM-10보다 2~3배 정도 높게 나타났다. GC/MS와 HPLC 크로마토그램을 분석한 결과 검출된 유기화합물은 BTEX, 페놀, MIBK, 벤젠유도체, 퓨란유도체, 지방족탄화수소, 포름알데히드, 아세트알데히드, N,N-dimethyl ethyl amine 및 암모니아 등이며, 이들 중 일부 화합물은 인체의 최소감지농도를 초과하는 것으로 나타났다. 이들 유기 화합물은 주물공정에서 원료로 사용하는 화합물이 분해되어 생성되는 반응부산물이거나 분해되지 않은 물질로서 휘발성유기화합물을 포함한 알데히드 및 아민으로 다양하다. This study was analysed a volatile organic compounds, odor compounds and dust from samples emitted a casting process. Volatile organic compounds were analysed using gas chromatography/mass spectrometer (GC/MS) with cryo-focusing/thermal desorption(CF/TD) system. The total suspended particles from casting dismantlement and casting sand treatment process are about 2 and 3 times higher than PM-10 of same positions. From the GC/MS and HPLC chromatograms, BTEX(benzene, toluene, ethylbenzene, and xylene), phenol, MIBK, benzene derivative, furan derivative, aliphatic hydro carbon, formaldehyde, acetaldehyde, N,N-dimethyl ethyl amine and ammonia were detected. These organic compounds indicates that by-products in the casting process vary in compounds from volatile organic compounds to aldehydes and amines.

절삭공정에서 발생되는 악취 및 VOC에 관한 연구

안문호 ( Wen-hao An ),박성호 ( Sung-ho Park ),신철호 ( Chul-ho Shin ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.4

본 연구에서는 금속의 절삭공정에서 방출되는 배출가스 중 휘발성유기화합물과 악취물질의 성분과 농도를 분석하였다. 휘발성유기화합물은 CF-TD 방식을 결합한 GC/MS로 분석하였다. 본 연구 결과에 의하면 아래와 같다. 1. 수용성 절삭공정에서 배출되는 휘발성유기화합물은 데칸, 운데칸과 지방족 유기화합물이 주된 화합물이다. 2. GC/MS 크로마토그램으로부터, C10~C18 사이의 지방족유기화합물이 RT 19~35분 사이에 나타났다. 3. 방청액에서의 데칸과 운데칸의 농도는 각각 5.62와 1.58ppm으로 조사됐다. 4. 금속의 절삭공정에서 검출된 알데히드와 황화합물의 유도체는 포름알데히드, 아세트알데히드, 프로피온알데히드 및 황화수소 등이다. This study was carried out to investigate the VOC(Volatile Organic Compound) and odor compounds which caused from metal cutting process. Volatile organic compounds were analysed using gas chromatography/mass spectrometer (GC/MS) with cryo-focusing/thermal desorption(CF/TD) system. Based on the results of this study, the followings are conclusions. 1. Volatile organic compounds from water soluble metal cutting solutions are decane, undecane and saturated aliphatic organic carbons. 2. From the GC/MS chromatograms, aliphatic organic carbons of the C10~C18 are detected at retension time 19~35 minute. 3. The concentrations of decane and undecane from corrosion inhibition solution were estimated as 5.62 and 1.58ppm, respectively. 4. The detected aldehydes and sulfur derivatives in metal working process were formaldehyde, acetaldehyde, propionaldehyde, and hydrogen sulfide.

토양 중 살균제 Pencycuron의 잔류 특성

안설화(Xue?Hua An),안문호(Wen?Hao An),임일빈(Il?Bin Im),이상복(Sang Bok Lee),강종국(Jong?Gook Kang) 한국농약과학회 2006 농약과학회지 Vol.10 No.4

경엽 및 관주처리에 따른 배추 중 Trifloxystrobin의 안전성 평가

안설화(Xue?Hua An),이상복(Sang Bok Lee),안문호(Wen?Hao An),김재덕(Jai Duk Kim) 한국농약과학회 2007 농약과학회지 Vol.11 No.1

Study on Bandwidth Frequency of Servovalve based on Metering Cylinder

S. D. Kim(김성동),Wen-Long An(안문용),S. H. Jeon(전세형) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.3

In this study, a metering cylinder was constructed, and the velocity obtained from the linear velocity transducer (LVT) of the cylinder piston was used to evaluate the dynamic performance of an electro-hydraulic servovalve. Frequency response experiments involving the spool displacement and piston velocity (LVT signal) were conducted with different input signal amplitudes, hydraulic pipe diameters, and supply pressures. The spool displacement signal accurately reflected the performance of the servovalve. Meanwhile, the -3 dB bandwidth frequency of the LVT signal was similar to the spool displacement signal, except for a small-amplitude input signal, and the -90° phase lag bandwidth frequency showed some differences.

A Research on the Bandwidth Frequency of Servo Valves Based on the Dynamic Flow Rate

S. D. Kim(김성동),Wen-Long An(안문용),S. H. Jeon(전세형) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6

In this paper flow rate signal and spool displacement signal were adopted to investigate the bandwidth frequency of servo valve. Spool displacement and flow rate dynamic response experiments on different input signal and hydraulic pipe diameter were implemented. The spool displacement dynamic response remains stable throughout, so it can be received accurately reflects the authentic performance of servo valve. Meanwhile the flow rate signal is easy disturbed by hydraulic environment and deviate from the spool displacement signal in small input signal and phase lag.

빗물활용을 위한 간이소독에 관한 연구

정팔진 ( Paul Gene Chung ),김민정 ( Min Jeong Kim ),박정훈 ( Jeong Hun Park ),안문호 ( Wen Hao An ) 전북대학교 공학연구원 (구 전북대학교 공업기술연구소) 2005 工學硏究 Vol.36 No.-

In this study, water quality characteristics in rainwater samples was analyzed to examine the microbial risk of rainwater for utilization. Unlike the quality of ground water and surface water, only a few total colonies have found in the precipitation samples. Many colony which inhabits in rainwater(rain-off) was found. It was examine water quality of rainwater. The study covers six months monitoring period. pH varied from 3.2 to 7.6 and color ranged from 20 to 60 CU. Turbidity was below 50NTU. The coliforms number ranged from 1000 to 41,111 number/ml. In the present study, a feasibility of an advanced oxidation using Plasma, Ozone, UV process for rainwater reclamation was investigated. Plasma, Ozone, UV process were introduced as a disinfection method to increase the killing effect for microorganisms. Contact time was changed from 3min to 20min to determine the optimum operation condition for the system. Increasing contact time, The coliforms number and the total colonies number was rapidly decreased. It is interesting to note that a 100% reduction in total coliforms and total colonies were achieved. Total coliforms and total colonies were successfully inactivated to the level of satisfying. Besides disinfection of the coliforms, approximately a 50% removal in DOC was pronounced at a contact time of 10min. More than 90% removal in turbidity, ss and color was also observed at a contact time of 10min with plasma. The application of plasma appeared to be one of options to reuse rainwater.

Comparative Study of Non-Point Pollution Runoff Between Reclaimed and Other Rural Land Use

루웨이웨이 ( Wei Wei Lu ),김필주 ( Pil Joo Kim ),유지앙화 ( Jiang Hua Yu ),이치타오 ( Qi Tao Yi ),안문호 ( Wen Hao An ),김영철 ( Young Chul Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2008 공동 추계학술발표회 Vol.2008 No.-

질염 의심 환자에서 플라즈마 활성수 분사법을 이용한 질 세정 효과

강주섭(J. S. Kang),강은경(E. K. Kang),전아름(A. Jeon),안문(Wen An),신현아(H. A. Shin),김윤정(Y. J. Kim),엄애선(A. S. Om) 한국재활복지공학회 2023 재활복지공학회논문지 Vol.17 No.1

플라즈마 활성수(PAW)는 플라즈마에서 발생하는 이온 및 라디칼을 물과 반응시킴으로써 물속에 다양한 활성종이 포함되도록 한 기능성 물이다. 본 연구에서 사용되는 방법은 질염(의심) 환자에서 PAW를 질벽 주름에 분사하고 도포하여 질염 원인균을 세정 후 바로 흡입하여 제거할 수 있는 장점이 있다. 본 임상연구에서는 질염(의심) 환자 총 94명을 대상으로 무작위 배정 후 베타딘 처치와 PAW 분사법을 적용하였으며, 세정 효과는 세정 전과 후의 질 분비물을 이용하여 12종 STD PCR을 수행하였으며, 세정 전 STD PCR 결과가 음성인 피험자를 제외한 대조군(베타딘 처치) 40명과 시험군(PAW 분사) 46명의 결과를 분석하였다. 베타딘 처리군에서는 베타딘 처리 전 PCR 양성 환자가 처리 후에도 모두 양성으로 재확인되어 처치효과가 나타나지 않았으나, PAW 분사군에서는 세정 전과 후의 유의적인 감소율을 보였는데, 그 중에도 Mycoplasma hominis의 경우 세정효과가 30±15.28%, Ureaplasma urealyticum은 25±9.93%, Ureaplasma parvum은 23±8.42%(P<0.001), Candida albicans은 28±10.86%로 각각 나타났다. 그러므로 PAW를 이용한 세정만으로도 질염 원인균을 세정하는데 효과가 있음을 보여주었으므로 PAW 분사 세정방법은 화학적 소독제 및 항생제, 항진균제의 새로운 대안으로 임상적 적용이 가능할 것으로 판단되었다. Plasma-activated water (PAW) is functional water in which various ionized gases and free radicals that originated primarily from oxygen and nitrogen gases in the air and water. In this study, PAW was applied by spraying the vaginal wall of vaginitis (suspected) patients, and the vaginal cleansing effect of PAW was evaluated by the sterilization effect on various vaginitis-causing microorganisms. In this clinical study, a total of 94 vaginitis (suspected) patients were randomly assigned, and the vaginal cleansing effect was compared and evaluated by applying betadine treatment (control) and PAW spray method. Vaginal secretions were collected before and after cleansing, and the cleansing effect of infectious microorganisms was evaluated by polymerase chain reaction (PCR) for 12 types of vaginitis causative microorganisms (STD). PCR results for infectious microorganisms were compared and analyzed for betadine (control, n=40) and PAW groups (experimental, n=46), excluding subjects with negative STD PCR results before washing. In the case of the control group, PCR-positive patients before betadine treatment were all positive after treatment, and no treatment effect was observed. However, in the experimental group, a significant decrease was observed after treatment compared to before treatment, with Mycoplasma hominis 30±15.28%, Ureaplasma urealyticum 25±9.93%, Ureaplasma parvum 23±8.42%, and Candida albicans 28±10.86%. Also, through comparison between the two groups, it was confirmed that PAW had a better cleansing effect than betadine. Therefore, spray treatment using PAW is expected to be clinically applied to vaginal cleaning of patients with suspected vaginitis as a new alternative to chemical disinfectants, antibiotics, and antifungals.