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Related Experiment Videos

Methane fermentation of bean curd refuse.

K Muroyama1, T Mochizuki, T Wakamura

  • 1Department of Chemical Engineering, Kansai University, 3-3-35 Yamate-cho, Suita City, Osaka 564-8680, Japan. muroyama@kansai-u.ac.jp

Journal of Bioscience and Bioengineering
|October 20, 2005
PubMed
Summary

Bean curd refuse fermentation for methane production shows yield increases with substrate loading, reaching a maximum of 53.7%. High loading rates can impede operation due to solid accumulation.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Chemical Engineering

Background:

  • Bean curd refuse is a significant waste product from food processing.
  • Methane fermentation offers a sustainable method for waste valorization and biogas production.
  • Optimizing reactor conditions is crucial for efficient anaerobic digestion.

Purpose of the Study:

  • To investigate the impact of substrate loading rate on methane yield during bean curd refuse fermentation.
  • To analyze the behavior of various product species under different loading conditions.
  • To determine the optimal conditions for maximizing methane production from bean curd refuse.

Main Methods:

  • Utilized a 1-liter draft tube reactor operating in a fed-batch mode with a daily feeding cycle.

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  • Employed two types of methanogens for the fermentation process.
  • Applied a unified material balance approach based on elemental carbon content for product analysis.

    • Main Results:

    • Methane yield increased with substrate loading rate, peaking at 53.7%, near the theoretical maximum.
    • A critical substrate loading rate was identified, beyond which unconverted solids accumulated excessively, hindering operation.
    • Product species distribution (methane, carbon dioxide, soluble TOCs, VFAs, ICs, cells) was analyzed in relation to loading rates.

    Conclusions:

    • Substrate loading rate is a key factor influencing methane yield and operational stability in bean curd refuse fermentation.
    • Optimal loading rates can achieve high methane yields, approaching theoretical limits.
    • Understanding solid accumulation is vital for preventing process failure in anaerobic digestion of food waste.