In this work, hydrodynamics and CO2 biofixation study was conducted in an airlift bioreactor at the temperature of 30 +/- 2 degrees C. The main objective of this work was to investigate the effect of high gas superficial velocity on CO2 biofixation using Chlorella vulgaris microalgae and its growth. The study showed that Chlorella vulgaris in high input gas superficial velocity also had the ability to grow and remove the CO2 by less than 80% efficiency. (C) 2017 Elsevier Ltd. All rights reserved.