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Application of the flotation process to thicken the sludge from a DAF plant
Dockko, S.,Park, S.C.,Kwon, S.B.,Han, M.Y. IWA Publishing 2006 Water Science & Technology Vol.53 No.7
<P>Dissolved air flotation (DAF) was evaluated for thickening of the sludges from a water treatment plant which uses DAF. Solid flux theory for gravity thickening was applied to the solid flux of DAF sludge. The higher the polymer dosage, at fixed solid concentration, the greater the rising velocity becomes. When applied with solid flux equations, a similar relationship to that of gravity thickening has been found. However, the values were much higher than in gravity thickening, because both the inflow solid concentration and the floating velocity were higher than for settled sludge. With this result, the proper dosage of polymer could be derived from the relationship between total solid flux and withdrawal velocity of DAF sludge.</P>
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.