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  • Volume 9, Issue 6

A new nozzle for dissolved air flotation

Y. Zhang, D. M. Leppinen, S. B. Dalziel
Published December 2009, 9 (6) 611-617; DOI: 10.2166/ws.2009.229
Y. Zhang
Research and Development, Yorkshire Water Services, Western House, Halifax Road, Bradford BD6 4SZ, UK E-mail: yanmin.zhang@yorkshirewater.co.uk
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D. M. Leppinen
School of Mathematics, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK E-mail: D.M.Leppinen@bham.ac.uk
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S. B. Dalziel
Department of Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Cambridge CB3 0WA, UK E-mail: S.Dalziel@cam.ac.uk
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Abstract

This paper examines an experimental study of optimal nozzle design for a dissolved air flotation system. The term optimal is in reference to field studies of bubble-floc agglomeration in an actual DAF tank. The primary mechanism of floc removal has been identified as bubble clustering. By understanding the significance of bubble clustering it was possible to design a nozzle that could be successfully operated at reduced saturation pressures while still achieving improved levels of turbidity in the post-DAF water.

  • bubble formation
  • bubble-floc agglomeration
  • nozzle design
  • © IWA Publishing 2009

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SELECTED ISSUE

Water Science and Technology: Water Supply: 18 (2)
  Volume 9, Issue 6

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A new nozzle for dissolved air flotation
Y. Zhang, D. M. Leppinen, S. B. Dalziel
Water Science and Technology: Water Supply Dec 2009, 9 (6) 611-617; DOI: 10.2166/ws.2009.229
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A new nozzle for dissolved air flotation
Y. Zhang, D. M. Leppinen, S. B. Dalziel
Water Science and Technology: Water Supply Dec 2009, 9 (6) 611-617; DOI: 10.2166/ws.2009.229

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Keywords

bubble formation
bubble-floc agglomeration
nozzle design
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