Lookup NU author(s): Dr Thea Ekins-Coward,
Dr Jonathan Lee,
Dr Gary Caldwell
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The effect of bubble size and rise velocity on the efficiency of a foam flotation microalgae harvesting unit was determined. Three sparger and input air flow combinations were used: 1. limewood sparger with constant airflow; 2. ceramic flat plate sparger with constant air flow; and, 3. ceramic flat plate sparger with an oscillating air flow. The ceramic sparger with oscillating flow generated the smallest bubbles within the liquid pool and the largest bubbles within the foam phase. This delivered the highest levels of biomass recovery due to enhanced bubble-algae collision and attachment efficiencies. Bubbles generated by the ceramic sparger under constant or oscillating air flow did not conform to the theory that smaller bubbles travel at slower velocities, due to momentum transfer to the liquid phase. Analyses of the harvest economics revealed that the ceramic flat plate sparger with a constant air flow delivered the best overall cost-benefit relationship.
Author(s): Coward T, Lee JGM, Caldwell GS
Publication type: Article
Publication status: Published
Journal: Journal of Applied Phycology
Print publication date: 01/04/2015
Online publication date: 07/08/2014
Acceptance date: 24/07/2014
Date deposited: 14/04/2015
ISSN (print): 0921-8971
ISSN (electronic): 1573-5176
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