Anaerobic digestion (AD) is a promising technique for waste management, which can achieve sludge stabilization and energy recovery. This study successfully prepared FeO@ceramsite from WAS and applied it as an additive in sludge digestion, aiming to improve the conversion of organics to biomethane efficiency. Results showed that after adding the FeO@ceramsite, the methane production was enhanced by 34.7% compared with the control group (88.0 ± 0.1 mL/g VS). Further mechanisms investigation revealed that FeO@ceramsite enhanced digesta stability by strong buffering capacity, improved sludge conductivity, and promoted Fe (III) reduction. Moreover, FeO@ceramsite has a larger surface area and better porous structure, which also facilitated AD performance. Microbial community analysis showed that some functional anaerobes related to AD such as and were enriched with FeO@ceramsite treatment. Potential syntrophic metabolisms between syntrophic bacteria (, associated with DIET) and methanogens were also detected in the FeO@ceramsite treatment AD system.

中文翻译：

---

污泥绿色合成Fe3O4@陶粒提高废活性污泥厌氧消化性能


厌氧消化（AD）是一种很有前景的废物管理技术，可以实现污泥稳定化和能量回收。本研究成功地从WAS中制备了FeO@陶粒，并将其作为污泥消化的添加剂，旨在提高有机物转化为生物甲烷的效率。结果表明，添加Fe3O@陶粒后，甲烷产量比对照组提高了34.7%（88.0 ± 0.1 mL/g VS）。进一步的机理研究表明，FeO@陶粒通过强大的缓冲能力增强食糜稳定性，提高污泥电导率，并促进 Fe (III) 还原。此外，FeO@陶粒具有更大的表面积和更好的多孔结构，这也有利于AD性能。微生物群落分析表明，Fe3O@陶粒处理富集了一些与 AD 相关的功能性厌氧菌，例如 和 。在 Fe3O@陶粒处理 AD 系统中还检测到了互养细菌（与饮食相关）和产甲烷菌之间潜在的互养代谢。