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Shanshan Chen1, Amelia-Elena Rotaru2, Pravin Malla Shrestha2

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • Biochar is a popular soil amendment for improving soil fertility.
  • Granular activated carbon (GAC) is known to promote direct interspecies electron transfer (DIET).

Purpose of the Study:

  • To investigate if biochar can promote DIET, similar to GAC.
  • To understand the mechanism of DIET promotion by biochar.

Main Methods:

  • Co-culturing Geobacter metallireducens with Geobacter sulfurreducens or Methanosarcina barkeri using ethanol as the electron donor.
  • Comparing DIET stimulation by biochar and GAC.
  • Observing microbial cell attachment to biochar.

Main Results:

  • Biochar stimulated DIET in co-cultures, despite being 1000 times less conductive than GAC.
  • Microbial cells attached to biochar but were not in close contact, indicating electron conduction through biochar.
  • Biochar's ability to promote DIET was demonstrated.

Conclusions:

  • Biochar can stimulate DIET, a process important in microbial communities.
  • This DIET stimulation by biochar may enhance methane production from organic wastes under anaerobic conditions.
  • Biochar's role in soil ecosystems extends beyond fertility improvement to facilitating microbial electron transfer.