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임계규 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.E2
A novel hybrid system composed of a biotrickling filter and an activated sludge reactor was investigatedunder the conditions of four different SRTs (sludge retention times). The performance of the hybridreactor was found to be directly comparable among the four different sludge ages. Discernible differencesin the removal performance were observed among four different SRTs of 2, 4, 6, and 8 days.bilized mixture culture, which allowed on pH control, addition of nutrients, and removal of paint VOCs(volatile organic compounds). The results also showed that the removal efficiency for a given pollutantdepends on the activity of microorganisms based on the SRT. As the SRT increased gradually from 2 to 8days, the average removal performance decreased. The highest removal rate was achieved at the SRT of 2-O2/liter-min was measured. Biologicalactivity in the recycle microbes decreased to a much lower level, 3.6mg-O2/liter-min at a SRT of 8days.of low concentrations and high flow rates. The apparent correlation of R2= 0.996 between the averageremoval efficiency and the average OUR at each SRTs suggests that VOCs degradation by young cellssignicantly affected the overall removal efciency for the tested SRTs.
DME합성공정의 DME+Methanol+CO₂ 혼합물 분리공정 개발에 관한 연구
임계규,백영순,조원일 한국공업화학회 2005 응용화학 Vol.9 No.1
Dimethyl Ether(DME) is a clean and economical alternative fuel which can be produced from various resources as natural gas, coal or biomass through synthesis gas(CO + H₂). The properties of DME are similar to those of LPG and it can be used for various fields; power generation fuel, transportation fuel, home fuel, etc. An innovative separation process for the direct synthesis of DME from synthesis gas has been under being developed. Newly developed separation process is composed of a DME separation column and a CO₂ separation absorption column. The DME production rate was set at 50 kg/day with purity of 99.5wt%. The CO₂ separation column is designed for CO₂ to be absorbed by MEA (monoethanol amine).
보텍스 사이클론을 이용한 Toluene과 CO₂처리효율에 관한 연구
임계규 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.4
The principle of vortex tube and cyclone was introduced to enhance the treatment efficiency of waste air streams containing particulate matters, toluene, and others developed by Hangreen Tech, Ltd. and Hoseo Chemical and Industrial Technology R & D Center. Adsorption, condensation, and/or coagulation could be induced at low temperature zone formed by vortex tube and Joule-Thomson expansion. The pressurized air was introduced at the tangential direction into the cyclone system applied with the coaxial funnel tube. Easily condensible vapors such as toluene, carbon dioxide, and water vapor were adsorbed enforcedly on coagulated or condensed materials which were formed as cores for coagulation or condensation by themselves. These types of coagulation or condensation rates were rapidly promoted as the diameter being growing up. The maximum removal efficiency for carbon dioxide and toluene was achieved to about 87 and 90 percent, respectively. The Joule-Thomson coefficients were increased with the pressure of air injected in the range of the relative humidities between 10% and 30%. An optimum value was observed within the range of the tested temperatures at a fixed pressure. In conclusion, it could be identified that the treatment efficiency would be depended on the pressure of the process air introduced and physical and chemical characteristics of waste air streams containing target materials for a designed system. The final design parameters should be decided depending upon the given system and target materials.