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

Journal of Chemical Technology and Biotechnology - Tập 79 Số 7 - Trang 782-788 - 2004
Mehmet Ali Yükselen1, John Gregory2
1Department of Environmental Engineering, Marmara University, Goztepe 81040, Istanbul, Turkey
2Department of Civil and Environmental Engineering, University College London, London WC1E 6BT, UK

Tóm tắt

AbstractThe 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. Copyright © 2004 Society of Chemical Industry

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Journal of Chemical Technology and Biotechnology

Tập 79 Số 7

782-788

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