淡水生態系における人為的硫酸塩汚染管理のための生物電気化学的リアクター：数理モデリングと実験的検証
Elevated sulfate concentrations in naturally low-sulfate freshwater environments can disrupt biogeochemical cycles and harm aquatic ecosystems. Bioelectrochemical systems (BES) offer a means of generating molecular hydrogen via water electrolysis to serve as an electron donor for sulfate-reducing bacteria, enabling in situ sulfate removal without resource-intensive chemical processes. This study developed an application-oriented mathematical model to assess BES performance across varied reactor configurations and operational conditions. The model incorporated hydrogenotrophic sulfate reduction coupled with iron sulfide precipitation through oxidative dissolution of ferrous iron from a stainless steel anode. Sulfate removal rates were found to correlate strongly with electrolytic hydrogen production rates and hydraulic residence time, while showing lower sensitivity to microbial kinetic constants. Model predictions were validated against pilot-scale BES data using nonacidic mine drainage, demonstrating close agreement and supporting the utility of mathematical modeling for scaling up BES-based remediation designs.
Molecular hydrogen generated by water electrolysis serves as an electron donor for hydrogenotrophic sulfate-reducing bacteria, converting sulfate to sulfide; the resulting sulfide precipitates as solid iron sulfide through oxidative dissolution of ferrous iron from a stainless steel anode.
This is basic research at the cellular or molecular level. For human application, inhalation is the most promising delivery route, but inhalation carries explosion risk and concentration matters (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/38642774