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용존공기부상법(DAF)에서 충돌메커니즘의 영향요인 분석
독고석,이형집 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5
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.
독고석,한무영 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6
Recently there has been an increasing interest to promote the utilization of rainwater. In this paper, the system that can collect rainwater on the different rainfall duration is designed to monitor pH, turbidity and heavy metal in rain with time dependent. The results show pH gradually accesses to 7 as turbidity decreases. Though the concentrations of iron and lead in first flushing exceed the criteria of drinking water, they return to below after first flushing depending on the collecting material. Namely, the concrete plate to collect rainwater affects water quallty to change low pH into high pH because of lime cmponent in the cement. And the organic compounds which have flowed into the tank with first flushing don' t deteriorate water quality any more even after preservation in room temperature for 60 days.