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  • Volume 49, Issue 1

Effect of mixing on the kinetics of polymer-aided flocculation

Stephanie Young, Daniel W. Smith
Published February 2000, 49 (1) 1-8;
Stephanie Young
Environmental Engineering Program, Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2M8, Telephone: +1 (780) 492 4138; Fax: +1 (780) 492 8289; E-mail: dwsmith@civil.ualberta.ca
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Daniel W. Smith
Environmental Engineering Program, Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2M8, Telephone: +1 (780) 492 4138; Fax: +1 (780) 492 8289; E-mail: dwsmith@civil.ualberta.ca
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Abstract

Polymer-aided flocculation is defined in this study as the coagulation and flocculation process which is accomplished by using alum in conjunction with a small dosage of polymer. Polymer is commonly used to improve flocculation performance; however, few in-depth studies of mixing requirements when using polymer as an aid have been reported. Presented is an evaluation of the effect of mixing on the kinetics of polymer-aided flocculation. The study found that the optimum G̅f-values occurred at 70 to 100 s−1, such that G̅f tb-values (Camp Number) were in the range of 113,000 to 144,000. The limited improvement in kinetics achieved by increasing the G̅f-value beyond 100 s−1 will probably not justify the higher energy consumption. Moreover, experimentation has shown that the maximum G̅f-value recommended for the design is G̅f=200 s−1 (G̅f tb=252,000), and the critical mixing rate occurred at G̅f=400 s−1 (G̅f tb=432,000), beyond which significant floc break-up will occur. The optimum G̅f-value determined from the study suggests that the currently designed flocculators using alum alone can be used when polymer is used as a coagulant aid. Thus, the use of polymer as a coagulant aid can improve the coagulation and flocculation efficiency in existing systems.

  • floc
  • flocculation
  • kinetics
  • mixing
  • polymer
  • size distributions
  • © IWA Publishing 2000

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Journal of Water Supply: Research and Technology - Aqua: 67 (2)
  Volume 49, Issue 1

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Effect of mixing on the kinetics of polymer-aided flocculation
Stephanie Young, Daniel W. Smith
Journal of Water Supply: Research and Technology - Aqua Feb 2000, 49 (1) 1-8;
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Effect of mixing on the kinetics of polymer-aided flocculation
Stephanie Young, Daniel W. Smith
Journal of Water Supply: Research and Technology - Aqua Feb 2000, 49 (1) 1-8;

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Keywords

floc
flocculation
kinetics
mixing
polymer
size distributions
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