Lorenzo Cristiani, Marco Zeppilli, Sergio Brutti, Sebastià Puig, Gaia Salvatori, Marco Petrangeli Papini, Marianna Villano
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引用次数: 0
摘要
甲烷生产微生物电解池(MEC)的性能明显依赖于其电活性阳极生物膜的活性和恢复能力。在此,我们研究了甲烷生产微生物电解池阳极生物膜在长时间(90 天)饥饿后的恢复能力,以及在不同应用阳极电位(即 +0.20 和 -0.10 V,与标准氢电极-SHE 相比)下的功能。循环伏安法被证明是描述生物膜电催化活性和跟踪生物膜再活化动态的有效方法。在所有测试条件下,阳极生物膜都能在不到 144 小时内从饥饿状态中迅速完全恢复。然而,饥饿降低了生物膜的电子传递冗余度,导致在较正电位(相对于 SHE 约 0.0 V)下运行的氧化还原位点消失,而形式电位低于相对于 SHE -0.18 V 的氧化还原位点得以保留。这项研究提供了令人信服的证据,证明了产甲烷的 MEC 的恢复能力和效率。
Impact of extended starvation conditions on bioelectrocatalytic activity of a methane-producing microbial electrolysis cell.
The performance of a methane-producing microbial electrolysis cell (MEC) markedly relies on the activity and resilience of its electroactive anodic biofilm. Here, the capability of an MEC anodic biofilm to recover following extended starvation periods (90 days) and to function under different applied anode potentials (i.e., +0.20 and -0.10 V, vs. Standard Hydrogen Electrode-SHE) was investigated. Cyclic voltammetry proved to be an insightful means to characterize the biofilm electrocatalytic activity and to track the dynamics of biofilm reactivation. Under all tested conditions the anodic biofilm rapidly and completely recovered from starvation in less than 144 h. However, starvation reduced the electron transfer redundancy of the biofilm causing the disappearance of redox sites operating at the more positive potentials (around 0.0 V vs. SHE) and retaining those having a formal potential lower than -0.18 V vs. SHE. This study presents compelling evidence for the resilience and efficiency of methane-producing MEC.
期刊介绍:
Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies.
Topics include:
• Biofuels: liquid and gaseous biofuels production, modeling and economics
• Bioprocesses and bioproducts: biocatalysis and fermentations
• Biomass and feedstocks utilization: bioconversion of agro-industrial residues
• Environmental protection: biological waste treatment
• Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.