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임경호(Kyeong Ho Lim),박영오(Young Oh Park),배병욱(Byung Uk Bae) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.2
Rapid sand filters in water treatment plants (WTP) is one of the most important step in order to remove fine particle including pathogens such as Criptosporidium and Giardia. Filters should be assessed based on their capability to achieve a treated water quality of less than 0.1 NTU on a continuous basis to ensure the integrity of the filtration process as a viable barrier in the treatment scheme. This is less than the 1.0 NTU standard, but operation of filters to produce filtered water quality confidence that pathogens are being removed prior to the last barrier, disinfection. In this study, to optimize existing filtration unit process, rapid sand filters working in S-WTP were evaluated for various factors. The results of comprehensive performance evaluation were followings. From the filter media analysis, effective size and uniformity coefficient of media was 0.90∼1.0 ㎜ and 1.44∼1.47, respectively. Therefore, the replacement of media is needed to optimize filter performance. Media loss was caused by air binding in the filter bed and improper operation of backwashing process. The ratio of the water used for filter washing to the amount of filtered water was 2.5∼3.0% during the winter and 1∼2% in the summer. At the beginning of a filter run, filtered water turbidity was over 0.5 NTU during about 20 min. Shorter filter run lengths was attributed to an overabundance of filter clogging algae (Synedra. sp), air binding, and too much floc in the filter influent.
논문(論文) : CFD모사 기법을 이용한 관내 혼화장치내 흐름 특성 평가
박대진 ( Dae Jin Park ),박영오 ( Young Oh Park ),박노석 ( No Suk Park ),김성수 ( Seong Su Kim ),왕창근 ( Chang Ken Wang ) 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
The modified in-line mixer which was suggested in this study for small water treatment facilities was evaluated on the performance of coagulation. For the objectives of this research, computational fluid dynamics(CFD) simulation was applied for analysis of flow characteristics within the modified in-line mixer. For verifying the results of CFD simulation, wet tests for the pilot plant were conducted. The wet test was to measure the actual coagulant dispersion distribution on the overall crosssection at a distance of 5.5D from the chemical injection point. From the results of CFD simulation and wet test, it was shown that the coagulant dispersion within the modified in-line mixer was occurred more uniformly than within the existing PDM(Pump diffusion Mixer). The results have confirmed the modified in-line mixer had several advantages compared with the existing PDM in terms of dispersion efficiency.
임경호 ( Kyeong Ho Kim ),정상만 ( Sang Man Jeong ),한영성 ( Young Sung Han ),박영오 ( Young Oh Park ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.3
The artificial aeration in the middle and the small scale reservoirs is widely used to destroy the stratified layer and algal boom. This study has been conducted at the Youncho reservoir located in Keoje island since Jan. 2000 to suggest the most suitable control strategy of the artificial aeration and reduce the side effect. The main results obtained from this research are as follows. The starting time of aeration for destratification was adjusted from the end of March to the beginning of April when the natural stratification is started. In order to prevent an anoxic condition the artificial mixing should be started by the middle of April when the DO in hypolimnion is dropped to less than 5mg/ℓ. The decrease DO, caused by the increase in water temperature, spreads rapidly from hypolimnion to themocline. Thermal stratification disappeared after the onset of artificial aeration within 7 days in the Yuncho reservoir. The air diffusers decrease water temperature in the layer of epilimnion and thermocline, but rise it in hypolimnion. The continuous operation of air diffuser prevent the stratification and anoxic condition in hypolimnion despite of the rising of water temperature and algal abundance. The algal abundance is not observed in effective zone by aeration, The turbidity rising problem induced from the aeration is avoided by keeping an air diffuser about 1.5m high from the bottom of lake. During the summer season, ceasing the aeration should be decided carefully. And also, it is necessary to operate the system it considering weather and temperature, and depending on the number and the position of aerators.
임경호,박영오,배병욱 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-
Rapid sand filters in water treatment plants(WTP) is one of the most important step in order to remove fine particle including pathogens such as Criptosporidium and Giardia. Filters should be assessed based on their capability to achieve a treated water quality of less than 0.1 ntu on a continuous basis to ensure the integrity of the filtration process as a viable barrier in the treatment schme. This is less than the 1.0 ntu standard, but operation of filters to produce filterd water quality confidence that pathogens are being removed prior to the last barrier, disinfection. In this study, to optimize existing filtraiton unit process, rapid sand filteres-woking in S-WTP were evaluated for various factors. The results of comprehensive performance evaluation were followings. From the filter media analysis, effctive size and uniformity coefficient of media was 0.90~1.0 mm and 1.44~1.47, respectively. Therefore, the replacement of media is needed to optimize filter performance. Media loss was caused by air binding in the filter ed and improper operation of backwashing process. The ratio of the water used for filter washing to the amount of filtered waster was 2.5~3% curing the winter and 1~2 % in the summer. At teh beginning of a filter run, filtered water turbidity was over 0.5 ntu during about 20 min. Shorter filter run lengths was attributed to an overabundance of filter clogging algae(Synedra sp), air binding, and too much floc in the filter influent.