Research Article
Apr 1970
Turbulence and Flocculation
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VIEW THE REPLYPublication: Journal of the Sanitary Engineering Division
Volume 96, Issue 2
Abstract
Designers of flocculators are required to select the residence time, the number of flocculation compartments, the stirrer characteristics and the energy requirements, such that these function in an optimum manner in the treatment of a particular water. This paper presents a rational performance equation incorporating these parameters and demonstrates its validity with measurements employing a continuously operating model flocculation apparatus. Performance is shown to be determined by both the energy dissipation rate and the type of stirring equipment, but excessive energies result in floc breakup and reduced performance. At any particular performance a minimum residence time is shown to exist corresponding to an optimum energy dissipation. Anemometric measurements demonstrate a linear relationship between the mean square fluctuating velocity and the root mean velocity gradient computed from energy measurements. Whereas different stirrers have similar turbulence spectra, they display quite different performance coefficients.
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Published In
Journal of the Sanitary Engineering Division
Volume 96 • Issue 2 • April 1970
Pages: 223 - 241
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Apr 1970
Published online: Feb 12, 2021
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Yerachmiel Argaman, AM.ASCE
Sr. Lecturer, Technion-Israel Inst. of Technology, Haifa, Israel.
Warren J. Kaufman, M.ASCE
Prof. of Sanitary Engrg., Univ. of California, Berkeley, Calif.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.