スピルリナ由来バイオ炭の生産・除去結合アプローチ：ライフサイクル評価と炭素会計への示唆
A coupled production-removal approach for Spirulina-derived biochar: Life cycle assessment and implications for carbon accounting (原題)
Asger Smidt-Jensen, Trine Boje Røgild, Asaf Tzachor, Hafþór Ægir Sigurjónsson, Gaurav Das, William R. Moomaw
🤖 gxceed AI 要約
日本語
スピルリナバイオマスをバイオ炭と土壌改良材（ビオスティミュラント）へ同時価値化する結合型生産・除去システムを、工場出荷ベースのLCA（GWP100）で評価した研究。土壌有機炭素の実測に基づく除去効果により、バイオ炭1kgあたり−613,429 kg CO₂-eqという強いネット負の気候影響を示す。綿・セメント・段ボール・ABS樹脂の4サプライチェーンへの適用可能性を論じ、排出・除去・貯蔵を企業インベントリで混同せず透明に報告すべきと強調する。
English
This study conducts a cradle-to-gate LCA (GWP100) of a coupled system valorizing Spirulina biomass into biochar plus a waste-derived biostimulant for soil carbon enhancement. Driven by field-measured soil carbon removal, it reports a strongly net-negative impact of −613,429 kg CO2-eq per kg biochar. Applying this across cotton, cement, cardboard and ABS supply chains, it argues emissions, removals and storage must be reported transparently and not treated as interchangeable in corporate inventories.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
SSBJ・有報でのScope3削減と炭素除去の扱いを分けて開示する議論に直結する。除去クレジットの恒久性・モニタリング枠組みを考える日本企業の参考になる。
In the global GX context
Speaks directly to ISSB/CSRD debates on separating emission reductions from carbon removals and storage in corporate inventories, and to supply-chain decarbonization accounting under Scope 3.
👥 読者別の含意
🔬研究者:LCAにおける除去・恒久性割引・不確実性の扱いと、結合型生産除去システムの評価手法の参考になる。
🏢実務担当者:上流素材に機能性成分を組み込むことでScope3削減と除去をどう報告・区別するかの実務的示唆を得られる。
🏛政策担当者:炭素除去の測定・モニタリング・報告枠組みと、除去をオフセットと混同しない会計ルール設計の論点を提供する。
📄 Abstract（原文）
Value-chain emissions constitute the majority of environmental impacts across industrial systems, yet scalable, life-cycle-based strategies for reducing these impacts remain limited. Biochar has been widely studied as a functional material with climate benefits, but its contribution to supply-chain decarbonization is typically constrained by moderate inclusion rates and limited impact per unit mass. This study evaluates a coupled production-removal system in which Spirulina biomass is simultaneously valorized into biochar and a waste-derived biostimulant for soil organic carbon enhancement, thereby directly linking microalgal production with land-based carbon removal. A comprehensive life cycle assessment (LCA) with a focus on climate impact (GWP100) is conducted on a cradle-to-gate basis, with 1 kg of biochar at the factory gate as the functional unit, including Spirulina cultivation, downstream processing and drying, pyrolysis, and waste-stream valorization through field application as a biostimulant for soil carbon enhancement. Soil carbon removal is based on primary field measurements of soil organic carbon, assessed using a 100-year GWP horizon and incorporating a 20% non-permanence discount and ± 20% uncertainty for the sequestration estimate. The results show a strongly net-negative climate impact of −613,428.6 kg CO₂-eq per kg biochar (GWP100), driven primarily by biostimulant-induced soil carbon removal of −615,690.6 kg CO₂-eq per kg biochar, while the non-climate impacts are mainly linked to the upstream cultivation rather than to the biochar itself. These impacts should therefore be seen as a part of the overall system. At product level, the low inclusion rates required (<7 g·t −1 ) result in negligible contributions to other impact categories, suggesting limited risk of burden shifting under the conditions assessed. Application across four supply chains - cotton textiles, cement/construction, corrugated cardboard packaging, and virgin ABS plastics - illustrates how integrating functional ingredients into upstream materials could generate system-level mitigation potential relevant to value chain decarbonization, provided that emissions, removals, and carbon storage are transparently reported and not treated as interchangeable within corporate inventories. These findings highlight the potential of coupled production-removal systems to contribute to sustainable production, while emphasizing the importance of site-specific conditions and robust monitoring frameworks.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.spc.2026.09.033first seen 2026-10-23 05:07:55 · last seen 2026-11-01 04:33:53
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