•A serial lantern-shaped draft tube was used to enhance flashing light in column PBR.•Increased radial solution velocity resulted in a decreased dark-light cycle period.•Mixing time decreased by 21% and mass-transfer coefficient increased by 26%.•Bubble retention time increased by 74% and bubble average diameter decreased by 37%.•Biomass yield was increased by 74% and pollutants removal was improved.
Bioresource Technology – Elsevier
Published: May 1, 2018
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