Faculty of Civil Engineering Technology, Universiti Malaysia Pahang (UMP), Lebuhraya Tun Razak, Gambang, Kuantan, Pahang, 26300, Malaysia.
Centre of Environmental Sustainability and Water Security (IPASA), Research Institute of Sustainable Environment (RISE), Faculty of Engineering, Universiti Teknologi Malaysia (UTM), Johor Bahru, 81310, Malaysia; PSU Energy Systems Research Institute, Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand.
Environ Res. 2022 Mar;204(Pt B):112043. doi: 10.1016/j.envres.2021.112043. Epub 2021 Sep 17.
Several strategies have been proposed to improve the performance of the anaerobic digestion (AD) process. Among them, the use of various nanoparticles (NPs) (e.g. Fe, Ag, Cu, Mn, and metal oxides) is considered one of the most effective approaches to enhance the methanogenesis stage and biogas yield. Iron-based NPs (zero-valent iron with paramagnetic properties (Fe) and iron oxides with ferromagnetic properties (FeO/FeO) enhance microbial activity and minimise the inhibition effect in methanogenesis. However, comprehensive and up-to-date knowledge on the function and impact of Fe-NPs on methanogens and methanogenesis stages in AD is frequently required. This review focuses on the applicative role of iron-based NPs (Fe-NPs) in the AD methanogenesis step to provide a comprehensive understanding application of Fe-NPs. In addition, insight into the interactions between methanogens and Fe-NPs (e.g. role of methanogens, microbe interaction and gene transfer with Fe-NPs) beneficial for CH production rate is provided. Microbial activity, inhibition effects and direct interspecies electron transfer through Fe-NPs have been extensively discussed. Finally, further studies towards detecting effective and optimised NPs based methods in the methanogenesis stage are reported.
已经提出了几种策略来提高厌氧消化（AD）过程的性能。其中，使用各种纳米颗粒（NPs）（例如 Fe、Ag、Cu、Mn 和金属氧化物）被认为是增强产甲烷阶段和沼气产量最有效的方法之一。基于铁的 NPs（具有顺磁性的零价铁（Fe）和具有铁磁性的氧化铁（FeO/FeO））可增强微生物活性并最大程度地减少产甲烷过程中的抑制作用。然而，经常需要综合和最新的知识来了解 Fe-NPs 对 AD 中产甲烷菌和产甲烷阶段的功能和影响。本综述重点介绍了基于铁的 NPs（Fe-NPs）在 AD 产甲烷步骤中的应用作用，以提供对 Fe-NPs 应用的全面理解。此外，还深入探讨了产甲烷菌与 Fe-NPs 之间的相互作用（例如产甲烷菌的作用、微生物相互作用和与 Fe-NPs 的基因转移），这有利于 CH 生产速率。广泛讨论了微生物活性、抑制作用和通过 Fe-NPs 的直接种间电子转移。最后，报道了针对在产甲烷阶段检测有效和优化的 NPs 基方法的进一步研究。
