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The effect of rapid mixing on the break-up and re-formation of flocs

Yukselen, MA; Gregory, J; (2004) The effect of rapid mixing on the break-up and re-formation of flocs. In: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY. (pp. 782 - 788). JOHN WILEY & SONS LTD

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Abstract

The effect of rapid mixing on floc formation, breakage and re-formation using aluminium sulfate ('alum'), polyaluminium chloride and a cationic polyelectrolyte were investigated using a continuous optical monitoring technique. For the aluminium-based coagulants it was found that, with shorter times of rapid mix, larger flocs were formed, but only limited re-growth occurred in all cases, indicating a significant irreversibility of the floc break-up process. For cationic polyelectrolytes, the re-growth of flocs occurred to a much greater extent and with longer rapid mix times floc breakage was almost fully reversible. Residual turbidity values before floc breakage and after re-formation were consistent with the dynamic monitoring results. (C) 2004 Society of Chemical Industry.

Type: Proceedings paper
Title: The effect of rapid mixing on the break-up and re-formation of flocs
Event: 4th World Congress on Particle Technology (WCPT4)
Location: SYDNEY, AUSTRALIA
Dates: 2002-07-21 - 2002-07-25
DOI: 10.1002/jctb.1056
Keywords: floc breakage, floc strength, flocculation, hydrolysing coagulant, polyelectrolytes, rapid mix, COAGULATION, ALUM
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: http://discovery.ucl.ac.uk/id/eprint/1334521
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