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One-dimensional spatial model for self-heating in compost piles: Investigating effects of moisture and air flow

Journal Article


Abstract


  • This paper considers the self-heating process which occurs within a compost pile using a one-dimensional spatially-dependent model incorporating terms that account for self-heating due to both biological and oxidation mechanisms. As the moisture content within a compost pile and the air flow through it are the two crucial factors in the degradation process, we use a model which incorporates four mass-balance equations, namely, energy, oxygen, vapour and liquid water concentrations, to investigate the behaviour of a compost pile when these two factors interact. Analyses of different initial water contents and air-flow velocities within a compost pile show that they can determine the efficiency of the biodegradation process. For an intermediate water content range and air-flow rate, the biological reaction is shown to be at its optimal value but there is also a possibility of spontaneous ignition within the compost pile.

Authors


  •   Luangwilai, Thiansiri (external author)
  •   Sidhu, Harvinder S. (external author)
  •   Nelson, Mark I.

Publication Date


  • 2018

Citation


  • Luangwilai, T., Sidhu, H. S. & Nelson, M. I. (2018). One-dimensional spatial model for self-heating in compost piles: Investigating effects of moisture and air flow. Food and Bioproducts Processing, 108 18-26.

Scopus Eid


  • 2-s2.0-85039869805

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/927

Number Of Pages


  • 8

Start Page


  • 18

End Page


  • 26

Volume


  • 108

Place Of Publication


  • United Kingdom

Abstract


  • This paper considers the self-heating process which occurs within a compost pile using a one-dimensional spatially-dependent model incorporating terms that account for self-heating due to both biological and oxidation mechanisms. As the moisture content within a compost pile and the air flow through it are the two crucial factors in the degradation process, we use a model which incorporates four mass-balance equations, namely, energy, oxygen, vapour and liquid water concentrations, to investigate the behaviour of a compost pile when these two factors interact. Analyses of different initial water contents and air-flow velocities within a compost pile show that they can determine the efficiency of the biodegradation process. For an intermediate water content range and air-flow rate, the biological reaction is shown to be at its optimal value but there is also a possibility of spontaneous ignition within the compost pile.

Authors


  •   Luangwilai, Thiansiri (external author)
  •   Sidhu, Harvinder S. (external author)
  •   Nelson, Mark I.

Publication Date


  • 2018

Citation


  • Luangwilai, T., Sidhu, H. S. & Nelson, M. I. (2018). One-dimensional spatial model for self-heating in compost piles: Investigating effects of moisture and air flow. Food and Bioproducts Processing, 108 18-26.

Scopus Eid


  • 2-s2.0-85039869805

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/927

Number Of Pages


  • 8

Start Page


  • 18

End Page


  • 26

Volume


  • 108

Place Of Publication


  • United Kingdom