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용존공기부상법 ( DAF ) 에서 미세기포와 입자간 충돌이론의 실험적 증명
독고석(Seok Dockko),한무영(Moo Young Han),박중현(Chung Hyun Park),남기진(Ki Jin Nam) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.2
In this research, the theoretical modeling of DAF which was obtained by trajectory analysis has been verified. Especially, the effects of electrostatic nature and particle size of bubble and particle (floc) was focused. To measure the electrostatic nature of bubble, zeta potential measuring setup was made in a well controlled laboratory. The effects of several operational parameters in DAF process are investigated on a system composed of batch DAF reactor, microscope and video system. The effect of pH on the removal efficiency of DAF is presented. The effect of mixing time is presented. The effect of zeta potential of floc and bubbles with the addition of coagulant is presented. It is found that all the phenomena can be explained primarily from the electrostatic nature of bubble and particle and secondarily from the effect of particle size. The findings from this research are compared and verified with the results of DAF modeling by α_(bp). This research will be helpful to understand and explain the process better and possibly can be used to modify and improve the DAF process.
용존공기부상법 ( DAF ) 에서 미세기포와 입자의 충돌이론
한무영(Moo Young Han),독고석(Seok Dockko),박중현(Chung Hyun Park) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.2
Biodegradability test for several hazardous chemicals found in the watershed of Daechung reservoir was investigated by using TOC-HANDAI method that is a combined technology of River Die-away test and HANDAI method. Aniline and phenol were easily mineralized by natural water microcosm and their initial degradation rates of samples from Daechung reservoir were much faster than those from the main streams of Kum rivers. This was probably due to the numbers and the activities of participated microorganisms during their respective degradation. It is obvious that the metabolic pathways of both chemicals were different, showing that phenol started degradation immediately without any adaptation period. Bispenol A(BPA) at each sampling points was appeared to be mineralized 68∼89% of initial TOC concentration by natural water microcosm. BPA seems more recalcitrant against biodegradation than simple aromatic compounds such as aniline and phenol in natural water environments. Moreover, the remaining TOC components in BPA biodegradation considered to be refractory metabolites of BPA. Consequently it is likely that BPA showed semi-recalcitrant while aniline and phenol were biodegradable compounds in the watershed of Daechung reservoir.