Abstract
Biogas must be pretreated before its use; thus, both physical and chemical methods have been implemented to remove the fuel’s principal pollutants (CO2 and H2S). Additional removal methods that use microorganisms’ biological processes to eliminate pollutants have also emerged. A selection was made from six bacterial isolates to obtain consortia that removed CO2 and eventually H2S through the enrichment of cultures and the construction of clone libraries of gene 16S ribosomal DNA (rDNA). The results indicate that the principal differences between consortia were determined in the culture medium. C5 and C6 consortia had photosynthetic biomass 1.42 and 1.52 μg/ml, respectively, and concentration of dissolved CO2 100.6 and 99.1 mg/l, respectively. The clone libraries showed that Rhodopseudomonas sp. had percentages 46.6, 42.5, and 86.8 % in C4, C5, and C6, respectively; Xanthobacter sp., 24.5 %, Castellaniella sp., 18 % in C5, and Sphingobium sp., 39.2 % in C4.
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This work was supported by FONDEF project no. D07 I-1008.
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Quiroz E., M. Selecting and Characterizing Bacterial Consortia with the Potential of Fixing CO2 and Removing H2S in a Biogas Atmosphere. Water Air Soil Pollut 225, 1934 (2014). https://doi.org/10.1007/s11270-014-1934-9
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DOI: https://doi.org/10.1007/s11270-014-1934-9