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From PET waste to biomaterials: life cycle analysis of PHB synthesis and enriched biomass strategies for PET upcycling

PET廃棄物から生体材料へ：PETアップサイクリングのためのPHB合成と濃縮バイオマス戦略のライフサイクル分析 (AI 翻訳)

Eduardo Lanzagorta Garcia, Everton Henrique Da Silva Pereira, Tomas Moura, Pedro Santana, Lutgart Stragier, Marija Nicevic, Margaret Brennan Fournet

Clean Technologies and Environmental Policy📚 査読済 / ジャーナル2026-04-20#エネルギー転換対象セクター: plastics
DOI: 10.1007/s10098-026-03488-7
原典: https://doi.org/10.1007/s10098-026-03488-7
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🤖 gxceed AI 要約

日本語

本研究は、廃PETから回収したテレフタル酸を用いたPHBおよびPHA濃縮バイオマスの生産プロセスの環境影響をLCAで評価した。PHB生産では次亜塩素酸ナトリウムとエネルギー消費が主要な影響源であり、PHA濃縮バイオマスでは電力消費が主要因である。従来のPET機械的リサイクルと比較して気候変動と化石資源消費の影響は低いが、光化学オゾン生成と淡水富栄養化の負荷は高い。持続可能性向上には発酵収率の向上、再生可能エネルギーの導入、より環境に優しい抽出方法、廃水処理の改善が必要である。

English

This study assesses the environmental impacts of producing PHB and PHA-enriched biomass from terephthalic acid recovered from waste PET via LCA. PHB production's main impacts come from sodium hypochlorite and energy use, while PHA-enriched biomass is dominated by electricity consumption. Compared to conventional PET mechanical recycling, both processes show lower climate change and fossil resource depletion impacts but higher photochemical ozone formation and freshwater eutrophication. Improvements require higher fermentation yields, renewable energy, greener extraction, and wastewater treatment.

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

日本ではプラスチック資源循環促進法やバイオプラスチック導入促進策が進む中、PETアップサイクリング技術のLCA評価は、政策立案や企業のサステナビリティ戦略に有用な定量的根拠を提供する。特に、再生可能エネルギー導入や廃水処理の重要性を示す点は、日本の循環経済政策と整合する。

In the global GX context

This LCA contributes to global discussions on sustainable plastics and circular economy, offering quantitative evidence for PET upcycling routes. It highlights trade-offs between climate benefits and other environmental impacts, relevant for policymakers and industry under frameworks like the EU's Circular Economy Action Plan and global net-zero targets.

👥 読者別の含意

🔬研究者:Provides a detailed LCA of novel PET upcycling processes, useful for comparing environmental trade-offs in biopolymer production.

🏢実務担当者:Offers insights for companies in plastics recycling or biopolymer production to identify hotspots and improve sustainability.

🏛政策担当者:Informs policy on plastic waste management and bioplastics by quantifying environmental impacts and benefits.

📄 Abstract（原文）

Abstract Plastic pollution is a complex global challenge that demands both creative solutions and thorough environmental evaluation. This study evaluates the environmental impacts of two novel approaches for producing poly(3-hydroxybutyrate) (PHB) and polyhydroxyalkanoate (PHA)-enriched biomass, respectively, utilising terephthalic acid recovered from waste PET through reactive extrusion depolymerisation. Life cycle assessment revealed that for PHB production, the highest environmental impacts are associated with the use of sodium hypochlorite and the high energy consumed during processing, resulting in significant effects on climate change, freshwater eutrophication, and photochemical ozone formation. On the other hand, the production of PHA-enriched biomass, which omits the PHA extraction step, derives that its main impacts from the electrical energy consumption, primarily affecting climate change and fossil resource use. When compared to conventional PET mechanical recycling, both processes exhibit lower impacts on climate change and fossil resource depletion footprints, but they still present greater burdens in terms of photochemical ozone formation and freshwater eutrophication. According to the results, improving sustainability will require higher fermentation yields, the adoption of renewable energy, greener extraction methods, and effective wastewater treatment. The findings suggest that innovative PET repurposing routes can reduce reliance on fossil resources and lower CO2 emissions but also highlight the need for further process improvements to reduce harm to freshwater ecosystems and air quality. Overall, this work adds to the conversation around sustainable plastics and emphasises the trade-offs involved in biopolymer production. Graphical Abstract

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