Life cycle assessment of biochar from two-step torrefaction and pyrolysis of microalgal biomass

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ID: 286930
2024
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Abstract
This study explored the sustainable production of microalgal biochar for graphite applications through a life cycle assessment (LCA) of 12 scenarios varying in CO2 source, pre-treatment methods, and pyrolysis temperature. Biomass subjected to two-step torrefaction and pyrolysis at 700°C has the highest carbon content (62.50 wt%), followed by 600°C (62.155 wt%), crucial for graphite application. Scenarios utilizing CO2 from flue gas exhibited net negative greenhouse gas (GHG) emissions (-155 to -263 kg CO2-eq), with pyrolysis as the hotspot. Conversely, scenarios using CO2 from gas tanks resulted in positive GHG emissions (600-708 kg CO2-eq), with cultivation as the hotspot. Scenario i, employing flue gas CO2 and the two-step process, emerged as the most environmentally favorable (-256.165 kg CO2-eq) with desirable biochar properties. Future research should explore carbon capture technologies, renewable energy integration, techno-economic analyses, process scale-up, and expanded system boundaries to develop a comprehensive and sustainable microalgal biochar production process.
Reference Key
persistent_1760660084_68f18a74883d5 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ko, Sophia C.
Journal Malay Journal
Year 2024
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etdm_mecheng/16
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