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A Semi-empirical Equation for Activity Coefficients of Ions with One Parameter
Lee, Jai-Yeop,Han, Ihnsup Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
Based on the Debye-H$\ddot{u}$ckel equation, a semi-empirical equation for activity coefficients was derived through empirical and theoretical trial and error efforts. The obtained equation included two parameters: the proportional factor and the effective radius of an ionic sphere. These parameters were used in the empirical and regression parameter fitting of the calculated values to the experimental results. The activity coefficients calculated from the equation agreed with the data. Transforming to a semi-empirical form, the equation was expressed with one parameter, the ion radius. The ion radius, ${\alpha}$, was divided into three parameters, ${\alpha}_{cation}$, ${\alpha}_{anion}$ and ${\delta}_{cation}$, representing parameters for the cation, anion and combination, respectively. The advantage of this equation is the ability to propose a semi-empirical equation that can easily determine the activity coefficient with just one parameter, so the equation is expected to be used more widely in actual industry applications.
Bio-Toxicity Assessment of PFOA and PFOS to Vibrio Fischeri by Photomultiplier Tube
Jai-yeop Lee,Hyun-dong Lee,Il-ho Kim Lee 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.10
Bio-toxicity using luminescence of PFOA and PFOS was assessed by photomultiplier tube. The assessment was evaluated based on EC50 and transient profile in time with varying concentration of 0.0~250 mg/L in 6 steps. As a result, the toxicity was found out to be 150.3 and 237.7 in EC50 for PFOA and PFOS, respectively. Besides, the profiles depicted that PFOA is more toxic than PFOS. As a result of applying 1CFOK model where actual toxic kinetics were applied, high kinetics parameters showing biological concentration or damage were drawn in case of PFOA. Also, it is determined that PFOA has a significant effect of chronic toxicity on the residual concentration. PFOS does not show a higher toxicity than PFOA, but it shows a fatal toxicity at near 250 mg/L and it can be concentrated, so measures for this substance are necessary
A Semi-empirical Equation for Activity Coefficients of Ions with One Parameter
Jai-Yeop Lee,한인섭 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
Based on the Debye-Hückel equation, a semi-empirical equation for activity coefficients was derived through empirical and theoretical trial and error efforts. The obtained equation included two parameters: the proportional factor and the effective radius of an ionic sphere. These parameters were used in the empirical and regression parameter fitting of the calculated values to the experimental results. The activity coefficients calculated from the equation agreed with the data. Transforming to a semi-empirical form, the equation was expressed with one parameter, the ion radius. The ion radius, α, was divided into three parameters, αcation, αanion and δcation, representing parameters for the cation, anion and combination, respectively. The advantage of this equation is the ability to propose a semi-empirical equation that can easily determine the activity coefficient with just one parameter, so the equation is expected to be used more widely in actual industry applications.
중압 자외선과 과산화수소 공정을 이용한 하수 3차 처리수중 총유기탄소와 미량오염물질 제거
이재엽 ( Lee Jai-yeop ),김일호 ( Kim Ilho ) 한국물환경학회(구 한국수질보전학회) 2020 한국물환경학회지 Vol.36 No.4
This study evaluated the applicability of UV-AOP process using medium-pressure UV lamp and H2O2 to remove TOC and emerging micropollutants in the effluent from a sewage treatment plant. The UV lamp with higher output(1.6∼8.0 kW) showed slightly higher amount of power in removing TOC of 1 mg/L(0.09 kWh/mg/L∼0.11 kWh/mg/L), however it was found that there was no significant difference for each cases. In addition, under the condition that the H<sub>2</sub>O<sub>2</sub> concentration is sufficient, as the power consumption of the UV lamp increases, the unit TOC removal concentration per unit H<sub>2</sub>O<sub>2</sub> decomposition concentration also increases, resulting in effective removal of TOC. The removal rate of 7 new trace contaminants, such as antibiotics by the UV-AOP tested, was at least 89.4%, and the ability to remove the emerging micro pollutants in the process was very effective. But, it was judged that it could not be excluded that the probablity of transforming to oxidated by-product in the case of a low TOC removal efficiency. Depending on the operating conditions of the UV and H<sub>2</sub>O<sub>2</sub> processes, a higher BOD concentration is found in the treated water than in the influent, and it is necessary to review the UV power and proper injection conditions of H<sub>2</sub>O<sub>2</sub> to maintain the BOD concentration increase below a certain level.
이재엽(Jai Yeop Lee),김일호(Ilho Kim) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.1
본 연구에서는 도로환경에 적용 가능한 통기성 정전필터를 개발하여 흡착능을 평가하였다. 흡착특성은 ASHRAE 52.1, 52.2 등의 방법으로 입경별 제거율과 압력별 흡착량 등을 평가하였다. 평가 입경범위는 0.3 μm~10.0 μm로 12단계로 제거율을 평가하였다. 필터는 2.5 μm 이상에서 91.3%의 제거율을 보였으며 그 미만의 범위에서는 입경에 따라 감소하여 평균 53.5%의 제거율을 보였다. ASHRAE Dust 합성 분진에 의한 중량 제거율은 초기압력 22.6 mmaq에서 말기압력 35 mmaq까지 측정된 결과, 96.7%였으며 이때까지 흡착량은 715.9 g/m²이었다. 압력에 따른 흡착형태는 Langmuir 선도를 보였다. 말기압력까지 흡착된 필터를 물세정으로 1, 2차 재생한 후 흡착을 평가한 결과 제거효율에는 차이가 없었으나 초기압력과 흡착량은 약간의 저하가 발생하였다. In this study, a electrostatic filter which could be applicable to road environment was developed and evaluated in adsorption capacity. The evaluation were performance for removal by particle size and adsorption amount by pressure using ASERAE 52.1 and 52.2. The range of size for removal test was 0.3 μm~10.0 μm which had 12 steps. The filter showed 91.3% removal efficiency from 2.5 μm and under the size, average 53.5% proportional to decreasing size value. The weight removal was 96.7% from 22.6 mmaq, initial pressure to 35 mmaq, end pressure with 715.9 g/m², the adsorption amount. The shape of isotherm was expressed as Langmuir’s one. After washing saturated filter with dust to end pressure, the initial pressure and adsorption amount of the filter showed a light drop with no removal efficiency decline.
Applications of Ozone Micro- and Nanobubble Technologies in Water and Wastewater Treatment: Review
Andinet Tekile,Ilho Kim,Jai-Yeop Lee 대한상하수도학회 2017 상하수도학회지 Vol.31 No.6
Water and wastewater treatment has always been a challenging task due to the continuous increase in amount and the change in characteristics of the poorly biodegradable and highly colored organic matters, as well as harmful micro-organisms. Advanced techniques are therefore required to successfully remove these pollutants from water before reuse or discharge to receiving water bodies. Application of ozone, which is a powerful oxidant and disinfectant, alone or as part of advanced oxidation process depends on the complex kinetic reactions and the mass transfer of ozone involved. Micro- and nano bubbling considerably improves gas dissolution compared to conventional bubbles and hence mass transfer. It can also intensify generation of hydroxyl radical due to collapse of the bubbles, which in turn facilitates oxidation reaction under both alkaline as well as acidic conditions. This review gives the overview of application of micro- and nano bubble ozonation for purification of water and wastewater. The drawbacks of previously considered techniques and the application of the hydrodynamic ozonation to synthetic aqueous solutions and various industrial wastewaters are systematically reviewed.