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Effects of biodrying process on municipal solid waste properties.

F Tambone1, B Scaglia, S Scotti

  • 1Gruppo Ricicla, Biomass and Bioenergy Laboratories, DiProVe, University of Milan, Via Celoria 2, 20133 Milan, Italy.

Bioresource Technology
|June 14, 2011
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Biodrying municipal solid waste (MSW) significantly increases its heating value and reduces environmental risks like odor and self-ignition. However, it also decreases potential biogas production by 28% due to organic matter degradation.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Biotechnology

Background:

  • Municipal solid waste (MSW) presents significant disposal challenges.
  • Reducing waste moisture content is crucial for improving energy recovery and minimizing environmental impacts.
  • Biodrying offers a potential pre-treatment method for MSW.

Purpose of the Study:

  • To investigate the effects of the biodrying process on the properties of municipal solid waste (MSW).
  • To evaluate changes in heating value, moisture content, and potential environmental impacts after biodrying.
  • To assess the implications of biodrying on subsequent biogas production.

Main Methods:

  • MSW was subjected to a 14-day biodrying process.
  • Key parameters including water content, net heating value (NHV), and organic fraction degradation were measured.
  • Potential for self-ignition and odor production was assessed.
  • Comparison of biogas production potential before and after biodrying was analyzed.

Main Results:

  • Biodrying reduced water content and increased the net heating value (NHV) of MSW by 41% (16,779±2,074 kJ kg⁻¹ wet weight).
  • Low moisture content in biodried waste reduced risks of self-ignition and odor production.
  • The biodrying process resulted in a 290 g kg⁻¹ VS loss of the organic fraction.
  • Total producible biogas was reduced by approximately 28% after biodrying.

Conclusions:

  • Biodrying enhances the energy content of MSW and mitigates immediate environmental hazards.
  • While beneficial for landfilling and energy generation through biogas, biodrying reduces the overall biogas yield due to organic matter loss.
  • Further research is needed to optimize biodrying to balance improved waste properties with biogas potential.