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Temperature effects on flocculation, using different coagulants

Fitzpatrick, CSB; Fradin, E; Gregory, J; (2004) Temperature effects on flocculation, using different coagulants. In: WATER SCIENCE AND TECHNOLOGY. (pp. 171 - 175). I W A PUBLISHING

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Abstract

Temperature is known to affect flocculation and filter performance. Jar tests have been conducted in the laboratory, using a photometric dispersion analyser (PDA) to assess the effects of temperature on floc formation, breakage and reformation. Alum, ferric sulphate and three polyaluminium chloride (PACI) coagulants have been investigated for temperatures ranging between 6 and 29degreesC for a suspension of kaolin clay in London tap water. Results confirm that floc formation is slower at lower temperatures for all coagulants. A commercial PACI product, PAX XL 19, produces the largest flocs for all temperatures; and alum the smallest. Increasing the shear rate results in floc breakage in all cases and the flocs never reform to their original size. This effect is most notable for temperatures around 15degreesC. Breakage, in terms of floc size reduction, is greater for higher temperatures, suggesting a weaker floc. Recovery after increased shear is greater at lower temperatures implying that floc break-up is more reversible for lower temperatures.

Type: Proceedings paper
Title: Temperature effects on flocculation, using different coagulants
Event: 2nd International Specialised Conference on Nano and Micro Particles in Water and Wastewater Treatment
Location: Zurich, SWITZERLAND
Dates: 2003-09-22 - 2003-09-24
Keywords: coagulants, flocculation, floc breakage, floc strength, temperature effects, FLOCS, STRENGTH, BREAKAGE
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/1334520
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