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Water Pollutant Assessment of Wastewater Treatment Plants in Daegu
Heri Nurohman,이태관,권혁준 한국수처리학회 2019 한국수처리학회지 Vol.27 No.6
Water pollution can be a severe problem for life and environmental health. Anthropogenic activity is one of the factors that can produce pollution in the water. Wastewater treatment plant (WWTP) is a solution to control pollutants from various anthropogenic activities. This study aims to investigate water quality parameters in several public WWTPs in Daegu City through a temporal and spatial variation approach. Wastewater from industrial sources has resulted in difficulties in the COD removal process (removal efficiencies: 85.3% - 92.7%) due to the presence of non-biodegradable organic content. Whereas Total Nitrogen (TN) became the most challenging pollutant to be removed at each WWTP with removal efficiencies ranging from 70.1% - 81.4%. Further effort is needed to increase the T-N removal efficiency in each WWTP and COD removal efficiency for industrial wastewater.
평면 레이저 유도 형광법을 이용한 메탄 예혼합 화염의 NO 및 OH 분포에 관한 실험적 연구
차민석(M.S.Cha),이원남(W.Lee),송영훈(Y.-H. Song),정석호(S.H.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
No and OH radical distributions have been measured in a methane/air premixed flame on a laminar co-fow burner. PLIF(planar laser induced fluorescence) of the A²∑^+ ― X₂∏₂(1.0) transition was excited for OH radical and the A²∑^+ ― X₂∏₂(0.0) transition was excited for NO using a Nd:YAG pumped OPO/FDO system. The OH radical concentration was decreased with N₂dilution due to the decrease of flame temperature in a flame of Φ=1.0. In a flame of Φ=1.6, however. the OH radical distribution was observed in the broader region and was not altered with N₂addition. NO LIF results show that the NO production in a Φ=1.6 flame in this co-flow burner was higher than that of a stoichiometric flame. The contribution of prompt NO is likely to responsible for this obseraation. The added N₂affects the NO concentration in different ways for Φ=1.0 and Φ=1.6 cases. The NO considered was decreased in a flame of Φ=1.0. where the thrmal NO is considered the only important mechanism. In a flame of Φ=1.6. N₂ addition did not change the NO concentration. where both the thermal and prompt NO mechanisme are important<br/>
LII/LIS 기법을 이용한 층류확산화염 매연입자의 정량화
정재우,이원남,한용택,김병수,이춘범,김덕진,이기형,Chung, J.W.,Lee, W.,Han, Y.T.,Kim, B.S.,Lee, C.B.,Kim, D.J.,Lee, K.H. 한국연소학회 2003 한국연소학회지 Vol.8 No.4
In this study, the quantification of soot particles in laminar diffusion flame with LII/LIS methods was performed. In these quantification, soot diameter, number density and volume fraction are included. For the quatification of soot particles, calibration tests are needed and the development of algorithm has to be performed. So, in this study, extinction and scattering test at co-flow burner were performed to acquire calibration data. And algorithm for LII/LIS simultaneous measurement for the quantification of soot were developed. The algorithm, which was the quantification of simultaneous photographing using one ICCD camera, to measure LII/LIS signal simultaneously, the best fitted light intensity and acquisition time was needed.