Purification of biogas using Cyanobacteria

José Leiton
Universidad de Costa Rica, Costa Rica
Laura Brenes
Universidad de Costa Rica, Costa Rica
Lorena Uribe-Lorío
Universidad de Costa Rica, Costa Rica
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Abstract

Objective: Investigate biological techniques to purify biogas. Methodology: Biogas with low carbon dioxide concentration was bubbled in two aqueous mediums containing different strains of Leptolyngbya sp. filamentous cyanobacteria and the results were compared with a blank. Results y Conclusions: Biogas that was partially purified, reduced its carbon dioxide concentration further from 20 % to < 10 % after being in contact with cyanobacteria and, at the same time, the oxygen produced during photosynthesis was kept below the explosion limit for the methane-oxygen mixture.  In contrast, the blank used to purify the biogas was saturated with carbon dioxide, causing a drop in pH as time elapsed. Methane content of the purified biogas was over 90 %. Its purity was measured with a volumetric method. The two strains of cyanobacteria used had a dry basis composition of protein ? 25 % and lipids < 2 %.

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How to Cite
[1]
J. Leiton, L. Brenes, and L. Uribe-Lorío, “Purification of biogas using Cyanobacteria”, Investigación e Innovación en Ingenierías, vol. 7, no. 2, pp. 76–85, Jul. 2019.

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