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An enhanced composting process with bioaugmentation: Mathematical modelling and process optimization.

Tea Sokač1, Anita Šalić1, Dajana Kučić Grgić1

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Bioaugmentation significantly improves biowaste composting by accelerating the thermophilic phase and increasing substrate conversion. Optimizing air flow and substrate mass further enhances composting efficiency, reducing overall time.

Keywords:
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Area of Science:

  • Environmental Science
  • Biotechnology
  • Waste Management

Background:

  • Biowaste composting is crucial for sustainable waste management.
  • Optimizing composting processes can enhance efficiency and reduce environmental impact.
  • Bioaugmentation offers a potential strategy to improve composting performance.

Purpose of the Study:

  • To compare the efficacy of biowaste composting with and without bioaugmentation.
  • To develop and validate a mathematical model for optimizing the composting process.
  • To identify key parameters influencing composting efficiency.

Main Methods:

  • Two composting processes were conducted in an adiabatic reactor over 14 days: one without and one with bioaugmentation.
  • A mathematical model was developed to estimate process parameters and simulate outcomes.
  • A Box-Behnken experimental design was used to determine optimal process conditions.

Main Results:

  • Bioaugmentation led to earlier achievement of the thermophilic phase and shorter composting times.
  • Processes with bioaugmentation showed higher substrate conversion rates.
  • Air flow rate and substrate mass fraction were identified as the most significant factors affecting the composting process.

Conclusions:

  • Bioaugmentation is an effective strategy for enhancing biowaste composting efficiency.
  • Mathematical modeling and experimental design are valuable tools for process optimization.
  • Adjusting air flow rate and substrate mass fraction can further improve composting outcomes.