The effect of bubble size on the efficiency and economics of harvesting microalgae by foam flotation

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• 作者：Thea Coward (1)
  Jonathan G. M. Lee (1)
  Gary S. Caldwell (2)
  
  1. School of Chemical Engineering and Advanced Materials ; Merz Court ; Newcastle University ; Newcastle upon Tyne ; NE1 7RU ; England ; UK
  2. School of Marine Science and Technology ; Ridley Building ; Newcastle University ; Newcastle upon Tyne ; NE1 7RU ; England ; UK
  
• 关键词：Chlorella ; Biomass ; Harvesting ; Algae ; Biofuel
• 刊名：Journal of Applied Phycology
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：27
• 期：2
• 页码：733-742
• 全文大小：496 KB
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• 刊物主题：Plant Sciences; Freshwater & Marine Ecology; Plant Physiology; Ecology;
• 出版者：Springer Netherlands
• ISSN：1573-5176

文摘

The effect of bubble size and rise velocity on the efficiency of a foam flotation microalgae harvesting unit was determined. Three sparger and input airflow combinations were used: (1) limewood sparger with constant airflow, (2) ceramic flat plate sparger with constant airflow and (3) ceramic flat plate sparger with an oscillating airflow. 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. The smaller bubbles generated by the ceramic sparger under constant or oscillating airflow had significantly faster rise velocities when compared to the larger bubbles produced by the limewood spargers. The faster velocities of the smaller bubbles were due to momentum transfer to the liquid phase. Analyses of the harvest economics revealed that the ceramic flat plate sparger with an oscillating airflow delivered the best overall cost-benefit relationship.