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Biopulping process design and kinetics.

M B Wall1, D C Cameron, E N Lightfoot

  • 1Biotechnology Center, University of Wisconsin-Madison, USA.

Biotechnology Advances
|January 1, 1993
PubMed
Summary
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Biopulping using white-rot fungi offers significant energy savings and improved paper tear index. Monitoring carbon dioxide production accurately models fungal growth for process optimization.

Area of Science:

  • Biotechnology
  • Forestry
  • Industrial Microbiology

Background:

  • Biopulping is a pretreatment for mechanical pulping using solid-state fermentation of wood chips.
  • White-rot fungi, specifically *Phanerochaete chrysosporium* and *Ceriporiopsis subvermispora*, are key organisms in biopulping.
  • P. chrysosporium demonstrates efficacy in biopulping without sterilization or nutrient supplementation, yielding energy savings and enhanced tear index.

Purpose of the Study:

  • To establish process modeling for biopulping feasibility through accurate kinetic data.
  • To develop methods for monitoring dry weight loss and growth rate using carbon dioxide (CO2) production.
  • To analyze fungal growth kinetics on supplemented and unsupplemented wood chips.

Main Methods:

  • Utilizing carbon dioxide (CO2) production as a proxy for monitoring dry weight loss and fungal growth rate.

Related Experiment Videos

  • Conducting solid-state fermentation of wood chips with white-rot fungi.
  • Comparing fungal growth kinetics on wood chips with and without nutrient supplementation.

    • Main Results:

    • Accurate kinetic data was obtained by monitoring CO2 production.
    • Fungal growth exhibited linear kinetics over time on unsupplemented wood chips.
    • Fungal growth demonstrated exponential kinetics over time on supplemented wood chips.

    Conclusions:

    • Biopulping shows practical and economic potential, necessitating process modeling.
    • CO2 monitoring provides a viable method for tracking biopulping progress.
    • Nutrient supplementation significantly impacts the kinetics of fungal growth during biopulping.