Microbiology of Anaerobic Systems


Research Topics

Anaerobic microorganisms, among them the oldest life-forms on Earth, display the most manifold metabolic pathways and lifestyles that have been ever invented by evolution, such as various mechanisms for energy conservation, carbon fixation, elemental cycling, fermentative conversion of organic matter and syntrophic interactions, enabling life on the thermodynamic edge. Anaerobic microbial communities play essential roles in biogeochemical cycles, natural attenuation of contaminated sites and various biotechnological processes, such as wastewater treatment, anaerobic digestion of organic waste and fermentative formation of valuable products.

The MicAS group studies the microbial ecology and physiology of anaerobic microbial communities in natural and engineered environments in order to identify microbial key players and their functions and to elucidate carbon and energy flows as well as microbial interactions. We aim at the biotechnological application of anaerobic microbiota, a deeper understanding of their functions in microbial ecosystem services, and novel insights into the ecophysiology of not yet cultured microbes (microbial dark matter).

In engineered systems such as anaerobic biorectors we develop microbiological strategies to optimize the production of biogas and other fermentation products by open mixed cultures (reactor microbiomes). The main objectives are i) to identify microbial parameters for process control and ii) to exploit novel feedstocks and microbial resources for the production of chemical building blocks and biofuels from renewable resources.

In environmental systems, we aim at the identification of microbial key players in biogeochemical cycles and contaminant degradation as well as the elucidation of the ecophysiological role of not yet cultured microbes.

Our research topics in detail:

  • Anaerobic digestion of lignocellulosic and nitrogen-rich waste
  • Bioaugmentation of anaerobic bioreactors
  • Biomethanation of hydrogen from excess electricity (Power-to-Gas)
  • Biotechnological application of anaerobic fermentations (carboxylate platform, syngas platform)
  • Carbon flow and syntrophic interactions in anaerobic consortia
  • Metagenome-based analysis of metabolic networks in anaerobic consortia
  • Microbial ecology of hydrocarbon-contaminated aquifers
  • Process monitoring based on biogas isotopic signature

MicAS April 2020

PhD students

Flávio César Freire Baleeiro
Zhe Cheng
Andreas Hardy Keller
Bin Liu
Washington Logroño
Emine Gözde Özbayram
Bruna Grosch Schroeder


Elke Häusler
Ute Lohse

Students and research

Magda Ardila
Daniel Kähl
Kuan-Po Liao

Guest scientist

Myra Afzal
Bogdan Rusu


Friederike Koppius
Jana Raab