the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The Ability of Froth Formed without Chemicals to Hold Bacteria
Ghanim Hassan
Robert G. J. Edyvean
Abstract. Froth flotation is a solid-liquid separation technique that uses hydrophobicity as a driving force. Bacteria and other drinking water microorganisms tend to be hydrophobic and can be removed from water using this application. The biggest limitation against using froth flotation in the drinking water industry is the difficulty of producing froth without chemical frothers
and holding bacteria in this froth without chemical collectors which deteriorate water taste and odor. Recently, researchers at the University of Sheffield described a method for producing froth using only water and compressed air. This has enabled froth flotation to be studied as an alternative to biocides for the removal of bacteria from drinking water.
This work examines the ability of froth, produced by controlling air pumping through a water column, to hold bacteria. Bacteria are moved to the top of the column and collected in the froth. The operating conditions determine the percentage of bacteria removed.
At optimum conditions, froth can hold up to 2×108 cfu/ml of bacteria. It has been found that air pumping at 130 l/min in a 20 cm diameter column will give the highest froth bacterial content. Time to reach stable froth bacterial concentration is decreased by increasing other variables.
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Ghanim Hassan and Robert G. J. Edyvean


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RC1: 'Review comments', Anonymous Referee #1, 08 Jan 2019
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AC1: 'Author Response', Ghanim Hassan, 13 Feb 2019
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AC1: 'Author Response', Ghanim Hassan, 13 Feb 2019
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RC2: 'review comments', Anonymous Referee #2, 30 Jan 2019
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AC2: 'Author Response', Ghanim Hassan, 13 Feb 2019
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AC2: 'Author Response', Ghanim Hassan, 13 Feb 2019


-
RC1: 'Review comments', Anonymous Referee #1, 08 Jan 2019
-
AC1: 'Author Response', Ghanim Hassan, 13 Feb 2019
-
AC1: 'Author Response', Ghanim Hassan, 13 Feb 2019
-
RC2: 'review comments', Anonymous Referee #2, 30 Jan 2019
-
AC2: 'Author Response', Ghanim Hassan, 13 Feb 2019
-
AC2: 'Author Response', Ghanim Hassan, 13 Feb 2019
Ghanim Hassan and Robert G. J. Edyvean
Ghanim Hassan and Robert G. J. Edyvean
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