Wang Panliang, Li Xunan, Li Ye, Su Yinglong, Wu Dong, Xie Bing
Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China; Henan International Joint Laboratory of Aquatic Toxicology and Health Protection, College of Life Sciences, Henan Normal University, Xinxiang, Henan 453007, PR China.
Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China.
Bioresour Technol. 2023 Mar;371:128633. doi: 10.1016/j.biortech.2023.128633. Epub 2023 Jan 16.
The effects of zero-valent iron (ZVI) and iron oxides nanoparticles on anaerobic digestion (AD) performance of food waste (FW) were comparably clarified in this study. Results indicated that the nanoparticles supplement effectively enhanced the methane yields. As observed, these nanoparticles accelerated organics transformation and alleviated acidification process. Also, the enriched total methanogens and functional bacteria (e.g., Proteiniphilum) were consistent with the promotion of oxidative phosphorylation, citrate cycle, coenzymes biosynthesis and the metabolisms of amino acid, carbohydrate, methane. Additionally, these nanoparticles stimulated electron transfer potential via enriching syntrophic genera (e.g., Geobacter, Syntrophomonas), primary acetate-dependent methanogens (Methanosaeta, Methanosarcina) and related functions (pilus assembly protein, ferredoxins). By comparison, ZVI nanoparticle presented the excellent performance on methanogenesis. This study provides comprehensive understanding of the methanogenesis facilitated by ZVI and iron oxides nanoparticles through the enhancement of key microbes and microbial metabolisms, while ZVI is an excellent option for promoting the methane production.
本研究比较明确了零价铁（ZVI）和铁氧化物纳米颗粒对食物垃圾（FW）厌氧消化（AD）性能的影响。结果表明，添加纳米颗粒有效提高了甲烷产量。可以观察到，这些纳米颗粒加速了有机物转化并缓解了酸化过程。此外，富集的总产甲烷菌和功能细菌（如嗜蛋白菌）与氧化磷酸化、柠檬酸循环、辅酶生物合成以及氨基酸、碳水化合物、甲烷的代谢促进作用一致。此外，这些纳米颗粒通过富集互营菌属（如地杆菌属、互营单胞菌属）、主要乙酸依赖型产甲烷菌（甲烷鬃菌属、甲烷八叠球菌属）和相关功能（菌毛组装蛋白、铁氧化还原蛋白）来刺激电子传递电位。相比之下，ZVI纳米颗粒在产甲烷方面表现出优异性能。本研究通过增强关键微生物和微生物代谢，全面了解了ZVI和铁氧化物纳米颗粒促进产甲烷的过程，而ZVI是促进甲烷产生的极佳选择。
