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.
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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.
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Canon-Rubio, K.A., Sharp, C.E., Bergerson, J. et al. Use of highly alkaline conditions to improve cost-effectiveness of algal biotechnology. Appl Microbiol Biotechnol 100, 1611–1622 (2016). https://doi.org/10.1007/s00253-015-7208-7
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DOI: https://doi.org/10.1007/s00253-015-7208-7