Biogas Biocatalysis: Methanotrophic Bacterial Cultivation, Metabolite Profiling, and Bioconversion to Lactic Acid: Article 2610

Calvin Henard, Michael Guarnieri, Tyler Franklin, Batool Youhenna, Sergey But, Danny Alexander, Marina Kalyuzhnaya, Tyler Franklin

Research output: Contribution to journalArticlepeer-review

Abstract

Anaerobic digestion (AD) of waste substrates, and renewable biomass and crop residues offers a means to generate energy-rich biogas. However, at present, AD-derived biogas is primarily flared or used for combined heat and power (CHP), in part due to inefficient gas-to-liquid conversion technologies. Methanotrophic bacteria are capable of utilizing methane as a sole carbon and energy source, offering promising potential for biological gas-to-liquid conversion of AD-derived biogas. Here, we report cultivation of three phylogenetically diverse methanotrophic bacteria on biogas streams derived from AD of a series of energy crop residues. Strains maintained comparable central metabolic activity and displayed minimal growth inhibition when cultivated under batch configuration on AD biogas streams relative to pure methane, although metabolite analysis suggested biogas streams increase cellular oxidative stress. In contrast to batch cultivation, growth arrest was observed under continuous cultivation configuration, concurrent with increased biosynthesis and excretion of lactate. We examined the potential for enhanced lactate production via the employ of a pyruvate dehydrogenase mutant strain, ultimately achieving 0.027 g lactate/g DCW/h, the highest reported lactate specific productivity from biogas to date.
Original languageAmerican English
Number of pages8
JournalFrontiers in Microbiology
Volume9
DOIs
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5100-72861

Keywords

  • anaerobic digestion
  • biogas
  • biogas upgrading
  • lactic acid
  • methane
  • methane biocatalysis
  • methanotroph

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