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Thermophilic anaerobic digester performance under different feed-loading frequency.

John Bombardiere1, Teodoro Espinosa-Solares, Max Domaschko

  • 1Division of Agricultural, Consumer, Environmental, and Outreach Programs, West Virginia State University, Institute, WV 25112-1000, USA.

Applied Biochemistry and Biotechnology
|May 15, 2008
PubMed
Summary

Increasing feed-loading frequency in anaerobic digesters improves biogas production and stability. Six feeds per day yielded the most biogas, optimizing performance for this chicken-litter slurry digester.

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Anaerobic digestion is a key process for waste treatment and biogas generation.
  • Optimizing digester performance is crucial for efficient energy recovery.
  • Feed-loading frequency is a critical operational parameter influencing digester stability and output.

Purpose of the Study:

  • To investigate the impact of varying feed-loading frequencies on the performance of a thermophilic anaerobic digester.
  • To determine the optimal feed-loading frequency for maximizing biogas production and stability.

Main Methods:

  • A 27.43 m(3) thermophilic anaerobic digester was utilized.
  • Chicken-litter slurry with 50.9 g/L chemical oxygen demand was fed at 0.93 m(3)/d.
  • Loading frequencies tested were 1, 2, 6, and 12 times per day.

Main Results:

  • Lower feed frequencies (1-2 times/d) resulted in less stable hourly pH, biogas production, and methane content.
  • No significant differences in methanogenic activity were observed across different loading frequencies.
  • The highest biogas production was achieved with a feed-loading frequency of six times per day.

Conclusions:

  • Feed-loading frequency significantly affects the stability of thermophilic anaerobic digesters.
  • A frequency of six times per day is optimal for maximizing biogas production from chicken-litter slurry.
  • Further optimization of operational parameters can enhance biogas yield and digester efficiency.