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  • Volume 59, Issue 5

Parameters affecting steady-state floc blanket performance

Matt Hurst, Monroe Weber-Shirk, Leonard W. Lion
Published August 2010, 59 (5) 312-323; DOI: 10.2166/aqua.2010.046
Matt Hurst
School of Civil and Environmental Engineering, Cornell University, Hollister Hall, Ithaca NY 14853-3501, USA Tel.: +1 607 255-8445 Fax: +1 607 255-9004 E-mail: mw24@cornell.edu
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Monroe Weber-Shirk
School of Civil and Environmental Engineering, Cornell University, Hollister Hall, Ithaca NY 14853-3501, USA Tel.: +1 607 255-8445 Fax: +1 607 255-9004 E-mail: mw24@cornell.edu
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Leonard W. Lion
School of Civil and Environmental Engineering, Cornell University, Hollister Hall, Ithaca NY 14853-3501, USA Tel.: +1 607 255-8445 Fax: +1 607 255-9004 E-mail: mw24@cornell.edu
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Abstract

A laboratory-scale reactor was used to simulate a water treatment process sequence of rapid mix, hydraulic flocculation, upflow clarification with a floc blanket, and lamellar sedimentation to accomplish removal of colloidal particles. This study focused on variables affecting performance of the floc blanket including: provision of hydraulic flocculation, raw water turbidity, coagulant dose, upflow velocity through the floc blanket, and bulk density and solids concentrations of the floc blanket. An upflow clarifier velocity between 1.0 and 1.3 mm s−1 produced the best floc blanket performance for turbidities studied between 10 and 200 NTU while an upflow velocity between 0.6 and 0.8 mm s−1 produced the best floc blanket performance at 500 NTU. The results show that overall particle removal efficiency improved with increasing hydraulic flocculator residence time and energy dissipation rate. Particle removal efficiency improved with increasing floc blanket depth for floc blanket depths between 15 and 75 cm. Lamellar sedimentation with a capture velocity of 0.12 mm s−1 is a key component in improving clarifier performance when utilizing a floc blanket.

  • floc blanket
  • flocculation
  • performance
  • steady-state
  • tube settlers
  • Received June 3, 2009.
  • Accepted December 22, 2009.
  • © IWA Publishing 2010

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Journal of Water Supply: Research and Technology - Aqua: 67 (2)
  Volume 59, Issue 5

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Parameters affecting steady-state floc blanket performance
Matt Hurst, Monroe Weber-Shirk, Leonard W. Lion
Journal of Water Supply: Research and Technology - Aqua Aug 2010, 59 (5) 312-323; DOI: 10.2166/aqua.2010.046
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Parameters affecting steady-state floc blanket performance
Matt Hurst, Monroe Weber-Shirk, Leonard W. Lion
Journal of Water Supply: Research and Technology - Aqua Aug 2010, 59 (5) 312-323; DOI: 10.2166/aqua.2010.046

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Keywords

floc blanket
flocculation
performance
steady-state
tube settlers
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