Dairy wastewater grease stabilizes in situ mesophilic biomethanation for H2-to-CH4 conversion
乳業廃水グリースがH2からCH4への変換のためのその場中温バイオメタン化を安定化する (AI 翻訳)
Ruiz-Lorenzo ML, Angela L, Moreno AD, Ferrari F, Diaz I, Contreras J, Iglesias R, Suarez S, Acedos MG
🤖 gxceed AI 要約
日本語
本研究は、乳業廃水由来のグリースを下水汚泥と共消化することで、中温条件（37°C）で安定したその場バイオメタン化が実現できることを示した。この基質駆動型の微生物選択により、高圧やガス循環を必要とせず、メタン濃度82%、変換効率90%を達成。間欠的な水素供給にも耐性があり、Power-to-Gas技術の簡素化とスケーラビリティ向上に貢献する。
English
This study demonstrates that co-digesting sewage sludge with dairy wastewater grease enables stable mesophilic in situ biomethanation. Substrate-driven microbial selection enriches hydrogenotrophic methanogens, achieving up to 82% methane and 90% conversion efficiency without pressurization or gas recirculation. The process tolerates intermittent hydrogen supply, simplifying Power-to-Gas implementation.
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
日本では水素社会実現と再生可能エネルギー導入拡大が進む中、本技術は余剰電力をメタンとして貯蔵・活用する手段として有望。特に食品廃棄物を活用する点で、廃棄物処理とエネルギーマネジメントの連携に寄与する。
In the global GX context
Power-to-Gas is critical for integrating variable renewable energy. This paper offers a low-cost, mesophilic biomethanation approach that reduces engineering complexity, making it more accessible for existing anaerobic digestion infrastructure globally.
👥 読者別の含意
🔬研究者:Highlights a substrate-driven microbial selection mechanism that challenges conventional engineering requirements for biomethanation.
🏢実務担当者:Provides a scalable method for dairy and wastewater treatment plants to produce renewable natural gas from waste lipids.
🏛政策担当者:Supports policies promoting Power-to-Gas and circular economy by demonstrating a practical, low-tech solution.
📄 Abstract（原文）
Power-to-Gas technologies are emerging as a key strategy to integrate surplus renewable electricity into energy systems, through the conversion of green hydrogen into methane. However, the practical implementation of biological in situ biomethanation is still constrained by operational and design requirements that are incompatible with most existing anaerobic digestion infrastructures. This study demonstrates a stable and efficient mesophilic (37 °C) in situ biomethanation process driven by substrate-induced microbial selection rather than relying on continuous hydrogen supply. Anaerobic digesters co-digesting sewage sludge from a wastewater treatment plant with lipid-rich greases recovered from dairy wastewater developed a pre-adapted hydrogenotrophic consortium capable of effective CO2-H2 conversion under mesophilic conditions. Long-term operation confirmed the robustness and persistence of this microbial structure. Upon H2 addition, methane concentrations up to 82 % were achieved under atmospheric pressure, without biogas recirculation, with hydrogen-to-methane conversion efficiencies up to 90 % and methane productivities of 1.64 NLCH4.L-1d-1. 16SrRNA-based microbial community analysis revealed that dairy grease co-digestion selectively enriched hydrogenotrophic methanogens, particularly Methanospirillum, together with syntrophic fatty-acid-degrading bacteria such as Syntrophomonas, promoting efficient interspecies hydrogen transfer. Importantly, the lipid co-substrate enabled the establishment and long-term stability of the hydrogenotrophic pathway independently of hydrogen availability, mitigating challenges associated with intermittent renewable energy supply. Overall, these findings challenge the common reliance on thermophilic conditions, continuous hydrogen input, pressurization, and gas recirculation in in situ biomethanation, demonstrating that substrate-driven microbial selection can replace conventional engineering requirements such as thermophilic operation or reactor modifications, providing a simpler and scalable strategy for mesophilic in situ biomethanation.
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.64898/2026.06.09.731101first seen 2026-06-15 04:41:27 · last seen 2026-06-16 04:30:19
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