Abstract：
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.
摘要：
在这项研究中，可以比较地阐明零价铁（ZVI）和氧化铁纳米颗粒对餐厨垃圾（FW）厌氧消化（AD）性能的影响。结果表明，纳米颗粒补充剂有效地提高了甲烷产量。正如观察到的，这些纳米粒子加速了有机物的转化，缓解了酸化过程。此外，富集的总产甲烷菌和功能细菌(例如，Proteinium）与氧化磷酸化的促进一致，柠檬酸盐循环，辅酶的生物合成和氨基酸的代谢，碳水化合物，甲烷。此外,这些纳米粒子通过富集互养属(例如，Geobacter,Syntrophomonas),主要的乙酸依赖性产甲烷菌(甲烷，甲烷弧)和相关功能(菌毛组装蛋白，铁氧还蛋白）。相比之下,ZVI纳米颗粒在产甲烷方面表现出优异的性能。本研究通过增强关键微生物和微生物代谢，全面了解ZVI和氧化铁纳米颗粒促进的甲烷生成，而ZVI是促进甲烷生产的绝佳选择。
