汚染された2つの製鉄所跡地における修復の環境フットプリント：ライフサイクル評価と修復後炭素収支シナリオの統合

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:LCAと生態系炭素収支を統合した方法論は、産業跡地のカーボンニュートラル評価研究に応用できる。

🏢実務担当者:工場跡地再開発を計画する企業は、修復段階の排出が植林で完全に相殺されないことを前提に削減計画を立てるべき。

🏛政策担当者:ブラウンフィールド再開発政策において、植林によるオフセット依存ではなく修復段階の排出削減を優先する規制設計が示唆される。

Remediation of contaminated industrial sites can create substantial immediate environmental burdens, whereas post-remediation ecological redevelopment can provide delayed carbon uptake. However, the extent to which ecological redevelopment can repay the upfront carbon debt from engineering-intensive remediation remains poorly characterized, particularly for large steel plant brownfields. To address this gap, we integrated life cycle assessment (LCA) with a project-scale net ecosystem carbon budget (NECB) framework for two former steel plant sites in China, one in Beijing (Site 1) and the other in Zhejiang (Site 2). The LCA used 1 m 3 of remediated soil as the functional unit within a harmonized core boundary covering material and energy inputs, transportation, remediation operations, and waste treatment, with site/project records for foreground inventories and Ecoinvent 3.1.0 for background data. Remediation generated 21,226 t CO 2 -eq at Site 1 and 73,849 t CO 2 -eq at Site 2, with the difference largely reflecting remediation scale. At the technology level, environmental impacts varied substantially and were driven by energy use, transportation, and technology-specific material inputs. Under the reference structural scenario, assuming afforestation of 70% of the site area, locally plausible forest types compensated 37.3–39.6% of the initial carbon debt at Site 1 after 100 years, while a theoretical evergreen broad-leaved forest upper bound reached 60.2%. The corresponding compensation at Site 2 was 11.9–20.0%, and none of the simulated forest types fully repaid the project carbon debt within 100 years. The projected compensation was strongly influenced by land availability and assumptions governing forest productivity-heterotrophic respiration coupling, whereas afforestation-establishment emissions had only a minor effect. Afforestation can therefore provide partial, long-term compensation for remediation-stage carbon debt but cannot substitute for direct emission reductions during remediation. Integrating remediation-stage environmental assessment with post-remediation carbon accounting provides a life cycle-oriented basis for coordinating lower-carbon remediation with ecological redevelopment of industrial brownfields.

• openalex https://doi.org/10.1016/j.jclepro.2026.149598first seen 2026-10-14 05:10:20