Abstract
In comparison with conventional photo-autotrophic cultivation, heterotrophic and mixotrophic cultivations of microalgae offers a feasible strategy to produce biomass and valuable chemicals through biorefinery processes. Supplementing microalgae cultures with organic carbon sources increase the biomass production and lipid/carbohydrate contents in cells. Consequently, this yields high productivity of biorefined products such as biodiesel, ethanol, starch and polyunsaturated fatty acids. Nevertheless, the addition of an organic carbon source imposes the necessity to pre-produce them and increase the cost and susceptibility of the cultures to microbial contamination. This chapter reviews the aspects related to the heterotrophic and mixotrophic cultivation of microalgae. These include advantages and limitations, metabolic routes of organic carbon assimilation, alternative carbon sources and main considerations for cultivation systems. It provides a comprehensive review of cultivated species, organic carbon sources and recently achieved productivity metrics. The chapter includes discussions regarding the main commercial products obtained using these cultivation modes and a simplified techno-economic analysis of the full biorefinery operation. The overarching aim of the chapter was to depict the main challenges for commercialization of chemical products using heterotrophic/mixotrophic cultivation of microalgae and identifies the promising research lines to achieve the same.
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Acknowledgement
We thank Ira Fogel of CIBNOR Mexico for editing the manuscript. Time for writing was provided by The Bashan Foundation, USA.
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Acronyms List
Acronyms List
- μ max :
-
Maximum growth rate
- BOD:
-
Biological oxygen demand
- C/N:
-
Carbon to nitrogen ratio of growth media
- CCD:
-
Central composite design
- COD:
-
Chemical oxygen demand
- DHA:
-
Docosahexaenoic acid
- EC:
-
Enzyme commission numer
- EM pathway:
-
Embden-Meyerhof pathway
- EPA:
-
Eicosapentaenoic acid
- FBA:
-
Flux balance analysis
- HRT:
-
Hydraulic retention time
- LEDs:
-
Light-emitting diodes
- mRNA:
-
Messenger RNA
- OMEGA:
-
Offshore Membrane Enclosures for Growing Algae
- PCR:
-
Polymerase chain reaction
- PP pathway:
-
Pentose phosphate pathway
- PUFAs:
-
Polyunsaturated fatty acids
- SMN:
-
Stoichiometric metabolic network
- STR:
-
Stirred tank bioreactor
- TCA cycle:
-
Tricarboxylic acid cycle
- VSS:
-
Dissolved volatile solids
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Perez-Garcia, O., Bashan, Y. (2015). Microalgal Heterotrophic and Mixotrophic Culturing for Bio-refining: From Metabolic Routes to Techno-economics. In: Prokop, A., Bajpai, R., Zappi, M. (eds) Algal Biorefineries. Springer, Cham. https://doi.org/10.1007/978-3-319-20200-6_3
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