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Updated: May 13, 2026

Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
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Syntrophic propionate degradation response to temperature decrease and microbial community shift in an UASB reactor.

Qiaoying Ban1, Jianzheng Li, Liguo Zhang

  • 1State Key Laboratory of Urban Water Resource and Environment, Harbin 150090, P. R. China.

Journal of Microbiology and Biotechnology
|March 7, 2013
PubMed
Summary

Lowering temperature significantly inhibits propionate degradation in anaerobic digesters, impacting overall performance. While some microbial communities adapt, efficiency decreases, highlighting the need for stable operating temperatures for optimal methane fermentation.

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Published on: July 13, 2012

Area of Science:

  • Environmental Science
  • Microbiology
  • Biotechnology

Background:

  • Propionate degradation is vital for efficient methane fermentation in anaerobic digesters.
  • Temperature fluctuations can disrupt the metabolic processes within these systems.
  • Understanding temperature effects on propionate conversion is crucial for optimizing digester performance.

Purpose of the Study:

  • To investigate the impact of temperature reduction on propionate degradation in an upflow anaerobic sludge blanket (UASB) reactor.
  • To analyze microbial community shifts in response to decreased temperatures.
  • To assess the relationship between temperature, microbial composition, and propionate removal efficiency.

Main Methods:

  • Operation of a UASB reactor using synthetic wastewater with propionate as the sole carbon source.
  • Stepwise temperature decrease from 35°C to 18°C while monitoring propionate removal.
  • Microbial community analysis (identifying propionate-oxidizing bacteria and methanogens) and specific COD removal rate (SCRR) measurements.

Main Results:

  • Propionate removal efficiency exceeded 94% at 30-35°C but was inhibited by stepwise temperature decreases.
  • While propionate removal recovered at 25°C, it remained significantly lower at 20°C and 18°C.
  • Specific microbial groups (Syntrophobacter, Pelotomaculum, Methanosaeta, Methanospirillum) showed resilience, though some propionate-oxidizing bacteria were enriched at 18°C. The specific CODPro removal rate (SCRR) decreased significantly at lower temperatures.

Conclusions:

  • Sudden and significant temperature drops negatively impact propionate degradation efficiency in UASB reactors.
  • While the overall microbial community structure remained relatively stable, specific propionate-oxidizing bacteria adapted to lower temperatures.
  • Maintaining stable, optimal temperatures is essential for sustained high performance in anaerobic digestion, as reduced SCRR indicates impaired functionality.