Status: this discussion paper is a preprint. It has been under review for the journal Drinking Water Engineering and Science (DWES). The manuscript was not accepted for further review after discussion.
The Ability of Froth Formed without Chemicals to Hold Bacteria
Department of Water Resources Techniques, Middle Technical University, Baghdad, Iraq
Robert G. J. Edyvean
Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield, UK
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.
Received: 06 Oct 2018 – Discussion started: 04 Jan 2019
As the froth is produced without chemicals, this introduces to use this technique to separate bacteria in drinking water. The problem now does this froth can hold bacteria or not. If yes, froth can be withdrawn continuously in order to purify drinking water. This work explores that.
As the froth is produced without chemicals, this introduces to use this technique to separate...
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