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Cited by 5Thermochemical Biomass Conversion ProcessesAnaerobic Digestion and Biogas ProductionComposting and Vermicomposting Techniques

Role of ambient pressure in self-heating torrefaction of dairy cattle manure

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Itoh, Takanori, Iwabuchi, Kazunori, Maemoku, Naohiro, Chen, Siyao, Taniguro, Katsumori·2020·PLOS ONE
DOI 10.1371/journal.pone.0233027PMC PMC7259747
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Abstract

This paper describes the role of ambient pressure in self-heating torrefaction of livestock manure. We explored the initiating temperatures required to cause self-heating of wet dairy cattle manure at different ambient pressures (0.1, 0.4, 0.7, and 1.0 MPa). Then, we conducted proximate, elemental, and calorific analyses of biochar torrefied at 210, 250, and 290°C. The results showed that self-heating was induced at 155°C or higher for 0.1 MPa and at 115°C or lower for 0.4 MPa or higher. The decrease of the initiating temperature at elevated pressure was due not only to more oxygen, but also to the retention of moisture that can promote chemical oxidation of manure. Biochar yields decreased with increasing torrefaction temperature and pressure, and the yield difference at 0.1 and 1.0 MPa was more substantial at lower temperatures: a 29.8, 16.4, and 9.4% difference at 210, 250, and 290°C, respectively. Proximate and elemental analyses showed that elevated pressure promotes devolatilization, deoxygenation, and coalification compared to atmospheric pressure; its impact, however, was less at higher temperatures as the torrefaction temperature became more dominant. Calorific analysis revealed that elevated pressure can increase the higher heating value (HHV) on a dry and ash-free basis at 210°C because of the increase in carbon content, but its impact is limited at 250 and 290°C. Meanwhile, the HHV on a dry basis exhibited the opposite trend due primarily to an enlargement of ash content. The present study revealed that ambient pressure considerably affects the initiating temperature of self-heating and the chemical properties of biochar at a low torrefaction temperature.

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  • Moisture buffers thermal stress by inhibiting oxygen diffusion, though excessive levels risk biological oxidation.

    “Moisture buffers thermal stress by inhibiting oxygen diffusion, though excessive levels risk biological oxidation [104,108,114].”

    From Pilot-Scale Slow Pyrolysis, Post-Heat Treatment, and Self-Heating Performance of Biochar Fuels Derived from Construction, Renovation, and Demolition (CRD) Wood Waste (2026) · cites this paper as [114]

    In Results and discussion, “Effects of ambient pressure on self-heating of manure” (page unavailable), the paper says retained moisture promotes oxidation and self-heating by facilitating oxygen contact, rather than buffering heating by inhibiting oxygen diffusion. It describes chemical oxidation, not a risk of biological oxidation at excessive moisture levels. (LLM, conf=0.82)

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Cited by

Sorted by citations

Authors
Itoh, T., Iwabuchi, K., Maemoku, N., Chen, S., & Taniguro, K.
Affiliations
Hokkaido University (JP)
Corresponding author
Iwabuchi, Kazunori
ORCID
Venue
PLOS ONE
Publisher
Public Library of Science (PLoS)
Published
2020-05-29
Volume
15
Issue
5
Pages
e0233027
ISSN
1932-6203 (ISSN-L)
DOI
10.1371/journal.pone.0233027
PMC
PMC7259747
OpenAlex
W3029513664
Cited by
5
References
37
Citations by year
2026: 2 · 2023: 2 · 2021: 1
FWCI
0.24
Type
journal article
Language
en
Open access
Licence
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Hokkaido University Collection of Scholarly and Academic Papers (Hokkaido University) (submittedVersion, cc-by)
Funders
  • Tanigurogumi Corporation
  • Japan Society for the Promotion of Science (JP26292130, JP17J00272)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
  • Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Composting and Vermicomposting Techniques
Keywords
torrefaction, dairy manure, ambient pressure, self-heating, biochar, higher heating value, moisture retention, devolatilization, deoxygenation, coalification
MeSH terms
Animals, Atmospheric Pressure, Carbon, Cattle, Charcoal, Hot Temperature, Heating, Manure

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