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Applied Microbiology and Biotechnology

, Volume 100, Issue 4, pp 1611–1622 | Cite as

Use of highly alkaline conditions to improve cost-effectiveness of algal biotechnology

  • Karen A. Canon-Rubio
  • Christine E. Sharp
  • Joule Bergerson
  • Marc Strous
  • Hector De la Hoz SieglerEmail author
Mini-Review

Abstract

Phototrophic microorganisms have been proposed as an alternative to capture carbon dioxide (CO2) and to produce biofuels and other valuable products. Low CO2 absorption rates, low volumetric productivities, and inefficient downstream processing, however, currently make algal biotechnology highly energy intensive, expensive, and not economically competitive to produce biofuels. This mini-review summarizes advances made regarding the cultivation of phototrophic microorganisms at highly alkaline conditions, as well as other innovations oriented toward reducing the energy input into the cultivation and processing stages. An evaluation, in terms of energy requirements and energy return on energy invested, is performed for an integrated high-pH, high-alkalinity growth process that uses biofilms. Performance in terms of productivity and expected energy return on energy invested is presented for this process and is compared to previously reported life cycle assessments (LCAs) for systems at near-neutral pH. The cultivation of alkaliphilic phototrophic microorganisms in biofilms is shown to have a significant potential to reduce both energy requirements and capital costs.

Keywords

Algal biofilms Alkaliphiles Biogas production CO2 absorption Alkaline cultures Bioenergy 

Notes

Acknowledgments

This study was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the University of Calgary’s Vice-President of Research, and the Campus Alberta Innovates Program Chair to Marc Strous.

Compliance with ethical standards

This article does not contain any studies with human participants or animals performed by any of the authors.

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

253_2015_7208_MOESM1_ESM.pdf (160 kb)
ESM 1 (PDF 159 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Karen A. Canon-Rubio
    • 1
  • Christine E. Sharp
    • 2
  • Joule Bergerson
    • 1
  • Marc Strous
    • 2
  • Hector De la Hoz Siegler
    • 1
    Email author
  1. 1.Department of Chemical and Petroleum EngineeringUniversity of CalgaryCalgaryCanada
  2. 2.Energy Bioengineering and Geomicrobiology Group, Department of GeoscienceUniversity of CalgaryCalgaryCanada

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