The production of engineered biochars in a vertical auger pyrolysis reactor for carbon sequestration
Open accessAbstract
Biomass pyrolysis and the valorization of co-products (biochar, bio-oil, syngas) could be a sustainable management solution for agricultural and forest residues. Depending on its properties, biochar amended to soil could improve fertility. Moreover, biochar is expected to mitigate climate change by reducing soil greenhouse gas emissions, if its C/N ratio is lower than 30, and sequestrating carbon if its O/Corg and H/Corg ratios are lower than 0.2 and 0.7, respectively. However, the yield and properties of biochar are influenced by biomass feedstock and pyrolysis operating parameters. The objective of this research study was to validate an approach based on the response surface methodology, to identify the optimal pyrolysis operating parameters (temperature, solid residence time, and carrier gas flowrate), in order to produce engineered biochars for carbon sequestration. The pyrolysis of forest residues, switchgrass, and the solid fraction of pig manure, was carried out in a vertical auger reactor following a Box-Behnken design, in order to develop response surface models. The optimal pyrolysis operating parameters were estimated to obtain biochar with the lowest H/Corg and O/Corg ratios. Validation pyrolysis experiments confirmed that the selected approach can be used to accurately predict the optimal operating parameters for producing biochar with the desired properties to sequester carbon.
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Higher pyrolysis temperature results in higher carbon content while losing nitrogen, hydrogen and oxygen contents of biochar structure with increase in the ash content and a reduction of volatile materials.
“Higher temperature results in higher carbon content while losing nitrogen, hydrogen and oxygen contents of biochar structure (Brassard et al., 2017) with increase in the ash content and a reduction of volatile materials (Imam and Capareda, 2012; Kim W. K. et al., 2013; Budai et al., 2014; Zambon et al., 2016; Zhao et al., 2017).”
From Effect of Pyrolysis Temperature on PhysicoChemical Properties and Acoustic-Based Amination of Biochar for Efficient CO2 Adsorption (2020) · cites this paper as Brassard et al., 2017
In §3.3 (page not available), biochars produced under higher-temperature conditions had higher carbon and lower hydrogen and oxygen contents. The same passage reports higher, not lower, nitrogen contents for two of the comparisons; temperature also changed alongside other operating conditions. The ash and volatile-matter clause is attributed to other citations, not Brassard et al. (LLM, conf=0.88)
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- Authors
- Brassard, P., Godbout, S., Raghavan, V., Palacios, J., Grenier, M., & Zegan, D.
- Affiliations
- Institut de Recherche et de Développement en Agroenvironnement (CA)
- Collège MacDonald (CA)
- Corresponding author
- Brassard, Patrick
- Venue
- Energies
- Publisher
- MDPI AG
- Published
- 2017-02-28
- Volume
- 10
- Issue
- 3
- Pages
- 288
- ISSN
- 1996-1073 (ISSN-L)
- OpenAlex
- W2593966153
- Cited by
- 73
- References
- 29
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 11 · 2023: 12 · 2022: 3 · 2021: 4 · 2020: 9 · 2019: 6 · 2018: 11 · 2017: 6
- FWCI
- 3.95
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Energies (publishedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- McGill University
- Fonds Québécois de la Recherche sur la Nature et les Technologies
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal and Kinetic Analysis
- Keywords
- engineered biochar, carbon sequestration, biomass pyrolysis, switchgrass, forest residues, pig manure, soil amendment, greenhouse gas emissions reduction, response surface methodology
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