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Poplar Sawdust Stack Self-Heating Properties and Variations of Internal Microbial Communities.

Zitao Yuan1, Wenbin Xu1, Zili He1

  • 1Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control & Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.

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Summary

Sawdust stack size significantly impacts spontaneous combustion risk by lowering critical ambient temperature. Microbial activity, fueled by moisture and oxygen, accelerates self-heating and decomposition, increasing fire hazards.

Keywords:
Critical Ambient Temperature (CAT)microbial communitiesphysicochemical propertiessawdust stackself-heating process

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Material Science

Background:

  • Microbial metabolic heat accumulation in stored sawdust can cause spontaneous combustion.
  • Understanding self-heating dynamics is crucial for preventing fires in biomass storage.

Purpose of the Study:

  • To investigate the Critical Ambient Temperature (CAT) variation in poplar sawdust stacks of different dimensions.
  • To analyze physicochemical properties and microbial community dynamics during sawdust self-heating.
  • To identify factors influencing self-heating and spontaneous combustion risks.

Main Methods:

  • Self-heating substances test experiments.
  • Application of Frank-Kamenetskii (FK) theory.
  • Sawdust stack self-heating experiments with controlled moisture and oxygen levels.
  • Microbiological community analysis.

Main Results:

  • Critical Ambient Temperature (CAT) decreased from 158.27 °C to 102.46 °C as stack size increased from 0.1 m to 3.2 m.
  • Increased moisture and oxygen enhanced microbial activity, raising stack temperature and accelerating decomposition of cellulose and hemicellulose.
  • Thermostable bacteria, including Brevibacillus thermoruber and Bacillus thermoamylovorans, were key in organic degradation at thermophilic stages (around 60 °C).

Conclusions:

  • Larger sawdust stacks have a higher risk of spontaneous combustion due to reduced CAT.
  • Optimizing storage conditions (cool, dry, low humidity) is essential to mitigate fire risks associated with sawdust.
  • Microbial communities, particularly thermophilic bacteria, play a significant role in the self-heating process of sawdust.