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Bacterial response to formaldehyde in an MFC toxicity sensor.

Hongbin Lu1, Yin Yu2, Hongbo Xi2

  • 1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China; College of Water Sciences, Beijing Normal University, Beijing, 100875, PR China.

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Area of Science:

  • Environmental microbiology
  • Electrochemical biosensing

Background:

  • Microbial fuel cells (MFCs) are recognized for their potential as toxicity sensors.
  • Changes in anode microbial activity alter MFC voltage in response to toxic substances.
  • The specific mechanisms driving these voltage changes remain underexplored.

Purpose of the Study:

  • To investigate anodic microorganism activity during MFC voltage drops under formaldehyde (FA) stress.
  • To analyze microbial community structure shifts in response to varying FA concentrations.
  • To elucidate the microbial basis for MFC voltage fluctuations when exposed to toxicants.

Main Methods:

  • Monitoring MFC voltage output under different formaldehyde (FA) concentrations.
  • Assessing the live/dead bacterial ratio in anode biofilms.
  • Analyzing microbial community composition using molecular techniques.
  • Comparing impacts of low- vs. high-concentration FA exposure.

Main Results:

  • MFC voltage drops under high FA concentrations (169.20 mg/L) exhibited five distinct stages.
  • Prolonged FA exposure significantly decreased the live/dead bacteria ratio, suggesting cell membrane damage.
  • Geobacter and other electrogenic bacteria were enriched, but community structure was sensitive to FA concentration and exposure duration.
  • Pseudomonas and Acidovorax populations were more negatively impacted by FA than Flavobacterium and Geobacter.

Conclusions:

  • Formaldehyde-induced cell membrane rupture is a primary cause of MFC voltage drops.
  • MFC toxicity sensing is directly linked to the physiological state and community dynamics of anode microorganisms.
  • Understanding microbial responses to toxicants is crucial for optimizing MFC biosensor performance.