Microalgae community shifts during the biogas upgrading in an alkaline open photobioreactor

Granada-Moreno, C, Aburto Medina, A, de los Cobos Vasconcelos, D and Gonzalez-Sanchez, A 2017, 'Microalgae community shifts during the biogas upgrading in an alkaline open photobioreactor', Journal of Applied Microbiology, vol. 123, no. 4, pp. 903-915.


Document type: Journal Article
Collection: Journal Articles

Title Microalgae community shifts during the biogas upgrading in an alkaline open photobioreactor
Author(s) Granada-Moreno, C
Aburto Medina, A
de los Cobos Vasconcelos, D
Gonzalez-Sanchez, A
Year 2017
Journal name Journal of Applied Microbiology
Volume number 123
Issue number 4
Start page 903
End page 915
Total pages 13
Publisher Wiley-Blackwell
Abstract Aims: To achieve the functional specialization of a microalgae community through operational tuning of an open photobioreactor used for biogas upgrading under alkaline conditions. Methods and Results: An open photobioreactor was inoculated with an indigenous microalgae sample from the Texcoco Soda Lake. A microalgae community was adapted to fix CO2 from synthetic biogas through different culture conditions reaching a maximum of 220 mg CO2 l?1 per day. Picochlorum sp. and Scenedesmus sp. were identified as the prominent microalgae genera by molecular fingerprinting (partial sequencing of 16S rRNA and 18S rRNA genes) but only the first was detected by microscopy screening. Changes in the microalgae community profile were monitored by a range-weighted richness index, reaching the lowest value when biogas was upgraded. Conclusions: A robust microalgae community in the open photobioreactor was obtained after different culture conditions. The specialization of microalgae community for CO2 fixation under H2S presence was driven by biogas upgrading conditions. Significance and Impact of the Study: The alkaline conditions enhance the CO2 absorption from biogas and could optimize specialized microalgae communities in the open photobioreactor. Denaturing gradient gel electrophoresis fingerprinting and richness index comparison are useful methods for the evaluation of microalgae community shifts and photosynthetic activity performance, particularly in systems intended for CO2 removal from biogas where the CO2 assimilation potential can be related to the microbial richness.
Subject Biocatalysis and Enzyme Technology
Keyword(s) alkaline photobioreactor
biogas
CO2 fixation
DGGE fingerprinting
microalgae
DOI - identifier 10.1111/jam.13552
Copyright notice © 2017 The Society for Applied Microbiology
ISSN 1364-5072
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