http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
사격장 납 오염토양 복원을 위한 토양세척시 HCl과 EDTA의 영향 연구
김효식,최상일,Kim, Hyo-Sik,Choi, Sang-Il 한국지하수토양환경학회 2008 지하수토양환경 Vol.13 No.1
본 연구에서는 실제 납 탄알로 오염된 사격장 토양에 대해 토양세척기법을 적용하기위한 lab-scale 실험을 수행하였으며 다음과 같은 결론을 얻을 수 있었다. 토양오염공정시험법과 EPA Method 3050B 분석결과 각각 4,803.5 mg/kg, 9,443 mg/kg으로 나타났다. 회분식 토양세척 실험에서 HCl을 세척제로 사용한 경우 농도증가에 따른 제거율은 로그적인(logarithmic) 경향을 나타내었고 0.1M에서 약 90% 정도 제거되었으며, EDTA는 농도에 비례하여 제거율도 증가하여 0.1 M에서 약 98%의 제거율을 보였다. 교반강도에 따른 시간별 세척효율을 분석한 결과, HCl과 EDTA를 사용한 경우 모두 교반강도의 증가와 비례하여 토양내 제거율이 증가하였으나 200 rpm과 300 rpm에서의 제거율은 유사한 것으로 나타났으며, 반응 초기 10분 이내에 대부분의 용출이 이뤄지고 60분 경과 후에는 제거율 증가가 둔화되었다. Laboratory soil washing experiments with HCl or EDTA were conducted to remediate lead-contaminated soil in a firing range. After lead bullets were removed by standard sieve #18 (1.0 mM), Pb concentrations were measured by EPA Method 3050B (9,443 mg/kg) and Korea Standard Test (4,803.5 mg/kg). The results of the batch test showed that the removal efficiency curve was logarithmic and approximately 90% of lead in soil was removed, when HCl was used. In case of EDTA, the removal efficiency increased proportionally to the concentration of EDTA, up to 98% lead removal with 0.1M EDTA. High mixing strength resulted in increase of removal efficiency and kinetics showed that the most lead was extracted in 10 min.
김효식(Hyo Sik Kim),김진호(Jin-Ho Kim),류재홍(Jae-Hong Ryu),정기진(Ki-Jin Jung),오승천(Seong-Cheon Oh),홍범의(Bum-Eu Hong),강석환(Suk-Hwan Kang),박노국(No-Kuk Park),우광재(Kwang-Jae Woo) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.2
The treatment of volatile organic compounds (VOC) emissions and its application are necessary today. The directly catalytic treatment of them has already proven to be environmentally and economically sound technology for the oxidation of the VOCs. Currently, the reforming of VOCs for hydrogen or syngas production are receiving great attention. However, few commercial examples exist. Therefore there exist a vast number of possibilities for VOC utilization via different catalytic processes, which creates also a good research potential for the future.
톨루엔의 스팀 및 자열개질을 위한 Ni계 촉매의 특성 평가
김효식(Hyo Sik Kim),김진호(Jin-Ho Kim),류재홍(Jae-Hong Ryu),홍범의(Bumui Hong),강석환(Suk-Hwan Kang),박노국(No-Kuk park),우광재(Kwang-Jae Woo) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.2
VOCs (volatile organic compounds) are the most common pollutants emitted from chemical plants and cause photochemical reactions in the atmosphere to produce ozone and photochemical oxidants that cause smog. In our project, there were carried out the syngas production by the reforming reaction using catalysts after adsorption and condensation steps to energize VOCs. In generally, the steam reforming reaction is an endothermic reaction, and so the heat source must be supplied from the outside. However, in order to reduce the amount of the external heat source, the reforming reaction can be performed by adding air or oxygen to the reactor similar to auto-thermal reforming reaction. Therefore, in this study, the steam reforming of liquid hydrocarbons such as toluene was carried out by using nickel-based catalysts in order to use the produced syngas as fuel for a gas engine. Additionally, the effect of oxygen supply on the efficiency of the reformer and the composition of syngas is examined.
김효식(Hyo-Sik Kim),김진호(Jin-Ho Kim),류재홍(Jae-Hong Ryu),강석환(Suk-Hwan Kang),김태훈(Tae-Hoon Kim),박노국(No-Kuk Park),우광재(Kwang-Jae Woo) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.1
SOx generated in the combustion process of sulfur-containing fuel was regulated globally along with NOx, CO, fine dust, etc. Currently, processes for SOx removal in flue gas were mainly used the wet methods in a variety of industries. On the other hand, the dry methods has not yet been developed with commercial technology, although it has the advantage of removing SOx in flue gas through physical or chemical adsorption over a wide temperature range. In this paper, the operation or regeneration temperature of the sorbents (such as single oxides, oxides supported on carbonaceous materials, oxides supported on zeolites and mesoporous materials) in the dry methods for removing SOx and the future research direction of this field are summarized.
초정밀 가공기를 이용한 적외선 감지소자 HgCdTe의 절삭특성에 관한 연구
김효식(Hyo-Sik Kim),양순철(Sun-Cheol Yang),김명상(Myung-Sang Kim),김건희(Geon-Hee Kim),이인제(In-Je Lee),원종호(Jong-Ho Won),조병무(Byoung-Moo Cho) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.4
This study aims to find the optimal cutting conditions, when are IR Detection device HgCdTe is machined with diamond tool of diamond turning machine. Machining technique for HgCdTe with single point diamond turning tool is reported in this paper. The main factors influencing the machined surface quality are discovered and regularities of machining process are drawn. It has been found HgCdTe has more and more important applications in the field of modern optics. The purpose of our research is to find the optimum machining conditions for ductile cutting of HgCdTe and apply the SPDT technique to the manufacturing of ultra precision optical components of brittle materials.