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저탁도시 PAC와 Ca-PAX의 입자제거 및 슬러지 탈수성 비교
심유섭,유명진,조희경,이상수,곽종운 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
This study was accomplished to evaluate the characteristics of particle removal and sludge dewatering and to find out the optimal condition of coagulation depending on the dosage of different coagulants (PAC, Ca-PAX) in low turbidity water. The experiments were carried out at a pilot plant of conventional rapid sand filtration system using artificial raw water. There was no large difference in the removal efficiencies of turbidity and total particle counts for both coagulants. However, Ca-PAX was required less than PAC to obtain the same efficiency of removal, and the initial head loss in a filter increased more fastly in case of PAC. The results on the evaluation of sludge from settling tank indicated that specific resistance of sludge was decreased inversely to the dose of both coagulant and specific resistance of Ca-PAX sludge was lower than that of PAC, therefore dewatering of sludge in case of Ca-PAX was better.
金德燦,安承丘,柳明辰 서울市立大學校 1985 論文集 Vol.19 No.-
Landfill gas is important to consider when evaluating the effect a landfill may have on the environment, because methane can explode. Thus, for the evaluating the parameters in gas generation from sanitary landfill site of municipal solid waste the generation mechanism was explained by taking into account anaerobic fermentation. Reported value of temperature of landfill site and C/N ratio of waste were in good condition for anaerobic fermentation. Chemical formula of waste of Nanjido disposal site was calculated to be C H O H S from the reported analytical data of chemical composition. By using this formula and predicted amount of waste was calculated to be 8.8x10 m. When using the predicted amount of decomposable components-garbage, paper, textile and wood-it was calculated to be 7.5x10 m. Assuming the decomposing period of those components the quantity of gas production with respect to time (year) was estimated by modifying the Sheldon-Arleta model.
Recovery Increase by Recycling Backwash Residuals in Microfiltration System
Yu, Myong-Jin,Pak, Hong-Kyoung,Sung, Il-Wha Korean Society for Environmental Sanitary Engineer 2008 대한환경위생공학회지 Vol.11 No.1
With the rise in membrane applications, residuals management has become a growing challenge for membrane system. The primary residuals of MF/UF (microfiltration/ultrafiltration) system results from the wastes generated during backwashing. Many regulatory agencies, utilities, and water process engineers are unfamiliar with the characteristics and methods for treatment and disposal of membrane residuals. Therefore, this study was performed to investigate the backwash residuals water quality from the pressurized system with and without pre-coagulation, and to suggest approaches for the backwash residuals treatment. Pressurized MF system was installed at Guui water intake pumping station and operated with raw water taken from the Han River. We compared performances with and without the recycling backwash residuals at flux conditions, 50 LMH and 90 LMH with and without pre-treatment (coagulation). Based on the results, recycling of backwash residuals in pressurized system with pre-coagulation showed applicability of backwash residuals managements. Moreover, the recovery rate also increased up to over 99%.
Recovery Increase by Recycling Backwash Residuals in Microfiltration System
Myong-Jin Yu,Hong-Kyoung Pak,Il-Wha Sung 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.4
With the rise in membrane applications, residuals management has become a growing challenge for membrane system. The primary residuals of MF/UF (micro filtration/ultrafiltration) system results from the wastes generated during backwashing. Many regulatory agencies, utilities, and water process engineers are unfamiliar with the characteristics and methods for treatment and disposal of membrane residuals. Therefore, this study was performed to investigate the backwash residuals water quality from the pressurized system with and without pre-coagulation, and to suggest approaches for the backwash residuals treatment. Pressurized MF system was installed at Guui water intake pumping station and operated with raw water taken from the Han River. We compared performances with and without the recycling backwash residuals at flux conditions, 50 LMH and 90 LMH with and without pre-treatment (coagulation). Based on the results, recycling of backwash residuals in pressurized system with pre-coagulation showed applicability of backwash residuals managements. Moreover, the recovery rate also increased up to over 99%.
경사판 침전지에서 저류벽의 설치위치에 따른 수리학적 특성의 평가
유명진 ( Myong Jin Yu ),김현철 ( Hyun Chul Kim ),류성호 ( Seong Ho Ryu ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.1
Sedimentation is one of the most common and important units in conventional water treatment plant. Structure such as various baffle walls and inclined plate settler may be obstacles to the horizontal flow when it is poorly designed. Therefore, the effects of these structures on characteristics of hydraulic flow must be evaluated to improve the settling efficiency of the floc. The hydraulic characteristic of the two sedimentations at Y water treatment plant (YWTP), which have different deflector baffles inside the settling basin, were investigated by tracer (fluoride) test. The inclined plate settler installed inside settling basin caused an undesirable impact on horizontal flow and produced dead zone. Solid baffle wall under the plate settler could help to minimize the formation of density currents and flow short circuiting. NalE used as a tracer was recovered more than 90% at investigated all basins. Morill index (t_(90)/t_10)), Modal index (t_p/T-HRT) and short-circuiting index ([M-HRT-t_p]/M-HRT) were determined from tracer test results performed at YWTP. Those indices ranged 2.95~3.02, 0.40~0.53 and 0.32~0.46, respectively.