Zeta potential measurement of bubbles in DAF process and its effect on the removal efficiency
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Dissolved Air Flotation (DAF) process has proved its efficiency in water treatment process and has gained much interest, however, the research to investigate the process from the fundamental characteristics of bubbles and particles has been limited.
In this research, the electrostatic nature of both bubble and particle/floc was focused. The zeta potential of bubbles is measured by a system composed of a measuring cell, microscope, video camera and a video image analyzer. The kaolin particle was measured by a commercial zeta meter. The zeta potential variation of bubbles and floc with pH are presented.
The effects of several operational parameters in DAF process are investigated on a 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 will be helpful to understand and explain the process better and possibly can be used to modify and improve the DAF process. Dissolved air flotation, zeta potential, bubble, kaolin, removal efficiency, pH, mixing time.
Keywordsdissolved air flotation zeta potential bubble kaolin removal efficiency pH mixing time
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