Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up

Abstract

The low power generation efficiency of microbial fuel cells (MFCs) is always a barrier to further development. An attempt to enhance the start-up and electricity generation of MFCs was investigated by adding different doses of zero-valent iron into anaerobic anode chambers in this study. The results showed that the voltage (289.6 mV) of A2 with 0.5 g of zero-valent iron added was higher than the reference reactor (197.1 mV) without dosing zero-valent iron (A4). The maximum power density of 27.3 mW/m² was obtained in A2. CV analysis demonstrated that A2 possessed a higher oxidation–reduction potential, hence showing a stronger oxidizing property. Meanwhile, electrochemical impedance analysis (EIS) also manifested that values of RCT of carbon felts with zero-valent iron supplemented (0.01–0.03 Ω) were generally lower. What is more, SEM images further proved and illustrated that A2 had compact and dense meshes with a hierarchical structure rather than a relatively looser biofilm in the other reactors. High-throughput sequencing analysis also indicated that zero-valent iron increased the abundance of some functional microbial communities, such as Acinetobacter, Ignavibacteriales, Shewanella, etc.

Key findings

• ▸Voltage of A2 with 0.5g zero-valent iron added was 92.5mV higher than reference reactor (289.6mV vs 197.1mV)
• ▸Maximum power density of 27.3mW/m² was obtained in A2
• ▸Zero-valent iron increased abundance of functional microbial communities such as Acinetobacter and Shewanella

Keywords

Identifiers

DOI

10.3390/ijerph17030806

Journal

International Journal of Environmental Research and Public Health

Year

2020