A review on the bioenergetics of anaerobic microbial metabolism close to the thermodynamic limits and its implications for digestion applications

Ling Leng, Peixian Yang, Shubham Singh, Huichuan Zhuang, Linji Xu, Wen Hsing Chen, Jan Dolfing, Dong Li, Yan Zhang, Huiping Zeng, Wei Chu, Po Heng Lee

Research output: Journal article publicationReview articleAcademic researchpeer-review

61 Citations (Scopus)

Abstract

The exploration of the energetics of anaerobic digestion systems can reveal how microorganisms cooperate efficiently for cell growth and methane production, especially under low-substrate conditions. The establishment of a thermodynamically interdependent partnership, called anaerobic syntrophy, allows unfavorable reactions to proceed. Interspecies electron transfer and the concentrations of electron carriers are crucial for maintaining this mutualistic activity. This critical review summarizes the functional microorganisms and syntroph partners, particularly in the metabolic pathways and energy conservation of syntrophs. The kinetics and thermodynamics of propionate degradation to methane, reversibility of the acetate oxidation process, and estimation of microbial growth are summarized. The various routes of interspecies electron transfer, reverse electron transfer, and Poly-β-hydroxyalkanoate formation in the syntrophic community are also reviewed. Finally, promising and critical directions of future research are proposed. Fundamental insight in the activities and interactions involved in AD systems could serve as a guidance for engineered systems optimization and upgrade.

Original languageEnglish
Pages (from-to)1095-1106
Number of pages12
JournalBioresource Technology
Volume247
DOIs
Publication statusPublished - Jan 2018

Keywords

  • Anaerobic digestion (AD)
  • Electron transfer
  • Kinetics
  • Syntrophy
  • Thermodynamics

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this