A novel volute aerator was proposed to generate shear force and break gas flow through water centrifugation to promote mass transfer for CO fixation with microalgae. The bubble evolution and gas-liquid mixing processes in volute aerator were numerically simulated. The bubble generation time and diameter were measured on a high-speed camera and assessed with level-set method. By optimizing gas inletpipe angle and water/gas inlet velocities of volute aerator, the bubble generation time decreased by 60.1% to 3.3 ms and outlet bubble diameter decreased by 50.7% to 1.8 mm, compared with traditional strip aerator. The corresponding gas-liquid mixing time reduced by 15.6% and mass transfer coefficient increased by 42.2%. The volute aerator was used as an alternative to traditional strip aerator to culture microalgae under high-purity CO condition, which promoted average growth rate and biomass production by 26.6% and 50.7%, respectively.

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http://dx.doi.org/10.1016/j.biortech.2018.09.067DOI Listing

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