熱化学-電気化学カップリングによる廃水処理のネット・ネガティブ炭素価値化

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

🔬研究者:Provides a comprehensive LCA and experimental validation of a novel carbon valorization pathway, useful for researchers in carbon capture, utilization, and storage (CCUS) and circular economy.

🏢実務担当者:Offers a potential technology for wastewater treatment plants to reduce emissions and produce valuable chemicals, relevant for sustainability teams in water utilities and chemical industries.

🏛政策担当者:Highlights a promising approach for integrating carbon circularity into wastewater infrastructure, informing policies on low-carbon industrial processes and waste management.

Wastewater treatment plants simultaneously emit greenhouse gases and rely on external carbon sources, presenting both a challenge and an opportunity for carbon circularity. We develop a comprehensive life-cycle assessment of 32 Waste-to-Chemical pathways that integrate thermochemical and electrochemical conversions in sequential or parallel architectures to convert CH4 and CO2 into reusable carbon sources for in-plant utilization. Sequential thermochemical-electrochemical coupling consistently delivers the strongest climate benefit, with formate identified as the optimal product, reducing emissions up to ~35% reduction relative to direct-emission baselines. We further validate this pathway experimentally using commercially available Pd/Al2O3 catalysts for CH4 thermochemical oxidation and Bi2O3 catalysts for CO2 electroreduction in a porous solid electrolyte reactor. Residual heat generated during CH4 oxidation enhances downstream CO2 electroreduction, enabling 97.2 ± 1.2% Faradaic efficiency toward separation-free formate at 150 mA cm−2 and 45 °C. These results validate that commercially relevant catalysts and thermally coupled operation can deliver experimentally validated performance aligned with system-level projections. This framework establishes a scalable strategy for embedding carbon circularity into wastewater infrastructure and transforming wastewater treatment plants into distributed platforms for low-carbon chemical production. The study assesses and experimentally validates a process that couples thermochemical methane oxidation with electrochemical carbon dioxide reduction to formate, enabling reduced greenhouse gas emissions and internal carbon reuse in wastewater treatment systems.

• openalex https://doi.org/10.1038/s41467-026-76941-2first seen 2026-08-19 04:52:30