Abstract
Purpose
The low conductivity of sediments for mass and electron transport is the most severe limiting factor in sediment microbial fuel cells (SMFCs), so that sediment ameliorations yielded more remarkable effects than electrode improvements. The objective of this research was to enhance the electricity generation of SMFCs with amendments of biochar to freshwater sediments for conductivity enhancement.
Materials and methods
Laboratory-scale SMFCs were constructed and biochars were produced from coconut shells at different temperatures. Variations in the power output, electrode potential, internal resistance, total organic carbon (TOC) content, and microbial communities were measured.
Results and discussion
Amending with biochar reduced the charge transfer resistances of SMFCs and enriched the Firmicutes (mainly Fusibacter sp.) in the sediment, which improved the SMFC power generation by two- to tenfold and enhanced the TOC removal rate by 1.7- to fourfold relative to those without the amendment.
Conclusions
The results suggested that biochar amendment is a promising strategy to enhance SMFC power production, and the electrical conductivity of biochar should be considered important when interpreting the impact biochar has on the electrical performance of soil or freshwater sediment MFCs.
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Acknowledgments
We are thankful for the grants from the Guangdong Natural Science Funds for Distinguished Young Scholars (2014A030306033) and the Science and Technology Planning Project of Guangzhou (2014Y2-00522), which supported this research.
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Chen, S., Tang, J., Fu, L. et al. Biochar improves sediment microbial fuel cell performance in low conductivity freshwater sediment. J Soils Sediments 16, 2326–2334 (2016). https://doi.org/10.1007/s11368-016-1452-z
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DOI: https://doi.org/10.1007/s11368-016-1452-z