Low energy ballasted flotation

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dc.contributor.author Jarvis, Peter -
dc.contributor.author Buckingham, P. -
dc.contributor.author Holden, B. -
dc.contributor.author Jefferson, Bruce -
dc.date.accessioned 2011-09-29T17:41:17Z
dc.date.available 2011-09-29T17:41:17Z
dc.date.issued 2009-08-01T00:00:00Z -
dc.identifier.citation P. Jarvis, P. Buckingham, B. Holden, B. Jefferson, Low energy ballasted flotation, Water Research, Volume 43, Issue 14, August 2009, Pages 3427-3434 -
dc.identifier.issn 0043-1354 -
dc.identifier.uri http://dx.doi.org/10.1016/j.watres.2009.05.003 -
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/3571
dc.description.abstract A novel process which involves the replacement or supplementation of bubbles in the dissolved air flotation process with low density beads is presented. The work comprised a series of bench-scale flotation trials treating three commonly encountered algal species (Microcystis, Melosira and Chlorella) that were removed in a flotation cell configured as either: conventional dissolved air flotation (DAF); ballasted flotation using low density 70 μm glass beads with a density of 100 kg m−3; or a hybrid process of ballasted flotation combined with conventional DAF. Results indicated that the bead only system was capable of achieving better residual turbidity than standard DAF at bead concentrations of 500 mg L−1. Addition of beads in combination with standard DAF reduced turbidity further to even lower residual turbidity levels. Algae removal was improved when glass beads were dosed, but removal was dependent on algal species. Microcystis was removed by 97% for bead only systems and this removal did not change significantly with the addition of air bubbles. Melosira was the next best removed algae with bead only dosed systems giving similar removals to that achieved by standard DAF using a 10% air recycle ratio (81 and 76% removal respectively). Chlorella was the least well removed algae by bead only systems (63% removal). However, removal was rapidly improved to 86% by the addition of air bubbles using only a 2% recycle ratio. Energy estimations suggested that at least a 50% energy reduction could be achieved using the process offering a potential route for future development of low energy separation processes for algae rem en_UK
dc.language.iso en_UK -
dc.publisher Elsevier Science B.V., Amsterdam. en_UK
dc.subject Algae en_UK
dc.subject Bubbleless en_UK
dc.subject Dissolved air flotation en_UK
dc.subject Energy en_UK
dc.title Low energy ballasted flotation en_UK
dc.type Article -

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