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조동우,김원식,장헌성,정태성,박종기,박종호 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
Adsorption and desorption dynamics of CF4 on an activated carbon bed were studied experimentally and theoretically, focusing on pressure-changing steps. The theoretical model used the ideal adsorbed solution (IAS) theory and the linear driving force (LDF) approximation as equilibrium and mass transfer models, respectively. Adsorption breakthrough curves of raw CF4 gas (500, 1,000, and 1,500 ppm) were well predicted by the theoretical model and the diffusion time constant for CF4 was found to be 3.3×10−3 s−1 from breakthrough curve fitting. Changes in the CF4 concentration during depressurization could be easily predicted using the above mathematical model when the half-cycle time (θc) was above 0.1. However, significant discrepancies were observed between the predicted CF4 concentrations and the experimental data when θc was 0.1. Nakao and Suzuki also reported that proportional constant of LDF approximation (=KDe/Rp 2) needs to be modified when θc is less than 0.1.
몽골 울란바토르시 게르촌 주택의 겨울철 실내 초미세먼지(PM 2.5 ) 농도의 시간적 변이
이보람(Boram Lee),이지영(Jiyoung Lee),장예림(Yelim Jang),김윤지(Yoonjee Kim),하헌성(Hunsung Ha),이우석(Wooseok Lee),최우석(Wooseok Choe),김규성(Kyusung Kim),우철운(Cheolwoon Woo),Chimedsuren Ochir,이기영(Kiyoung Lee) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.1
Objectives: In Mongolian housing, they use coal as a fuel for indoor heating and cooking. The combustion of coal releases particulate matter, which can affect indoor air quality. The purpose of this study was to analyze the concentrations of indoor PM 2.5 Methods: In this study, indoor PM 2.5 concentrations, temperature and humidity in houses were measured by a real-time PM monitor, while the time activity patternsof the residents were also observed. Results: The correlation between factors that may affect the indoor air quality was analyzed.The indoor PM 2.5 concentrations were 178.4±152.7 µg/m 3 (n=37). Five types of indoor PM 2.5 concentrations have been classified, which were associated with indoor activity. The stove type, fuel types and indoor activities such as cleaning, cooking and opening the stoves were not significantly associated with indoor PM 2.5 levels. Conclusions: Further study is needed to determine the effect of stove type through 24hours of indoor air quality monitoring.