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Related Experiment Videos

Effect of iron concentration on hydrogen fermentation.

Y J Lee1, T Miyahara, T Noike

  • 1Water Quality Research Department, National Institute of Environmental Research, Seoul, Republic of Korea.

Bioresource Technology
|October 17, 2001
PubMed
Summary

This study optimized iron (FeCl2) concentration for microbial hydrogen production from sucrose. Optimal iron levels enhance hydrogen yield and sucrose degradation efficiency by mixed microorganisms.

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Area of Science:

  • Biotechnology
  • Microbiology
  • Biochemical Engineering

Background:

  • Microbial hydrogen production is a sustainable energy source.
  • Iron is a crucial cofactor for many microbial enzymes involved in fermentation.
  • Optimizing iron concentration is key to maximizing hydrogen yield and efficiency.

Purpose of the Study:

  • To investigate the impact of varying iron (FeCl2) concentrations on microbial hydrogen production.
  • To determine the optimal iron concentration for maximizing hydrogen yield and production rate.
  • To analyze the effect of iron on the production of other fermentation byproducts and biomass.

Main Methods:

  • Utilized mixed microorganisms from a soybean-meal silo.
  • Cultured microorganisms in sucrose solution with FeCl2 concentrations ranging from 0 to 4,000 mg/L.

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  • Maintained a constant temperature of 37°C.
  • Measured hydrogen production rate, yields of hydrogen and byproducts (acetate, propionate, butyrate, ethanol, butanol), sucrose degradation efficiency, and biomass production yield.

    • Main Results:

    • Maximum specific hydrogen production rate of 24.0 ml/g VSS/h at 4,000 mg FeCl2/L.
    • Optimal iron concentrations for maximum yields: hydrogen (800 mg/L), acetate (3 mg/L), propionate (200 mg/L), butyrate (200 mg/L), ethanol (5 mg/L), and butanol (3 mg/L).
    • High sucrose degradation efficiency (close to 1.0) observed between 200-800 mg FeCl2/L.
    • Maximum biomass production yield of 0.283 g VSS/g sucrose at 3,000 mg FeCl2/L.

    Conclusions:

    • Iron concentration significantly influences microbial hydrogen production and fermentation pathways.
    • Specific iron concentrations are optimal for maximizing hydrogen yield, byproduct formation, and biomass production.
    • Controlled iron supplementation can enhance the efficiency of microbial hydrogen production from sucrose.