Modeling of DAF: the effect of particle and bubble characteristics

Research Article| February 01 2002 Modeling of DAF: the effect of particle and bubble characteristics Mooyoung Y. Han Mooyoung Y. Han 1School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, 151-742, Korea Tel:+82 2 880-8915 Fax: +82 2 889-0032; E-mail: myhan@gong.snu.ac.kr Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2002) 51 (1): 27–34. https://doi.org/10.2166/aqua.2002.0003 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll JournalsThis Journal Search Advanced Search Citation Mooyoung Y. Han; Modeling of DAF: the effect of particle and bubble characteristics. Journal of Water Supply: Research and Technology-Aqua 1 February 2002; 51 (1): 27–34. doi: https://doi.org/10.2166/aqua.2002.0003 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex The characteristics of bubbles and particles in dissolved air flotation (DAF) will govern the collision efficiency between bubbles and particles and thereafter the removal efficiency of a suspension. In this paper, the collision efficiency factor for bubbles and particles (αbp) is calculated from a trajectory analysis by a method similar to that used for the calculation of the collision efficiency factor in differential sedimentation (αds) (Han & Lawler 1991). The effects of the contributing parameters in the bubble-particle-solution system are investigated. The most important parameters in the DAF system are found to be the surface characteristics (zeta potential) of both bubbles and particles. The next most important parameters are the sizes of the bubbles and the particles. The density of the particles has a positive or negative effect on αbp depending on the sizes of particles and bubbles. The ionic strength of the solution affects the αbp slightly. The theoretical results can explain some of the current practices in the design and operation of the DAF process. bubble size, bubble-particle collision efficiency factor (αbp), particle density, particle size, trajectory analysis, zeta potential This content is only available as a PDF.