4.8 Article

Characteristic time scales of mixing, mass transfer and biomass growth in a Taylor vortex algal photobioreactor

期刊

BIORESOURCE TECHNOLOGY
卷 198, 期 -, 页码 283-291

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.09.013

关键词

Mass transfer; Taylor vortex reactor; Taylor-Couette flow; Photobioreactors

资金

  1. National Science Foundation [CBET-1236676]
  2. Directorate For Engineering
  3. Div Of Chem, Bioeng, Env, & Transp Sys [1236676] Funding Source: National Science Foundation
  4. EPSCoR
  5. Office Of The Director [1101284] Funding Source: National Science Foundation
  6. Office Of The Director
  7. EPSCoR [GRANTS:13905722] Funding Source: National Science Foundation

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Recently it has been demonstrated that algal biomass yield can be enhanced using fluid flow patterns known as Taylor vortices. It has been suggested that these growth rate improvements can be attributed to improved light delivery as a result of rapid transport of microorganisms between light and dark regions of the reactor. However, Taylor vortices also strongly impact fluid mixing and interphase (gas-liquid) mass transport, and these in turn may also explain improvements in biomass productivity. To identify the growth-limiting factor in a Taylor vortex algal photobioreactor, experiments were performed to determine characteristic time scales for mixing and mass transfer. By comparing these results with the characteristic time scale for biomass growth, it is shown that algal growth rate in Taylor vortex reactors is not limited by fluid mixing or interphase mass transfer, and therefore the observed biomass productivity improvements are likely attributable to improved light utilization efficiency. (C) 2015 Elsevier Ltd. All rights reserved.

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