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Purpose <p>This study aims to develop an integrated water and sediment remediation system, based on Sediment Microbial Fuel Cells (SMFCs) principles, complemented by ecological floating islands, to facilitate the deployment of SMFCs technology in engineering-scale projects.</p> Materials and methods <p>In this paper, an SMFC device combined with an ecological floating island was constructed. Through laboratory-scale and production-scale experiments, the application methods and restoration effects of SMFCs in urban river ecological restoration projects were explored.</p> Results and discussion <p>The device constructed in this study could operate stably in both laboratory-simulated environments and eutrophic urban rivers. The results showed that, in terms of power generation performance, compared with the device without an ecological floating island, the operating voltage of the ecological floating island-SMFC increased by 3.26 times, and the power density increased by 10.21 times. In terms of pollutant removal, the COD, NH3-N, TN, and TP in the water body were greatly affected by the upstream water, while the removal effects of TN and TOC in the sediment and the P fixation effect were significant. In terms of microbial community changes, the species diversity and abundance near the anode of the SMFCs device increased, among which Desulfobacterota and Proteobacteria were the dominant phyla, and the ecological floating island changed the microbial community structure.</p> Conclusions <p>An ecological floating island has a certain promoting effect on the performance of SMFCs, which indicates promise for the application of SMFCs on a large scale.</p>

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In situ restoration of river sediment by sediment microbial fuel cells enhanced with ecological floating islands

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Xiao Li,
  • Jiarui Qi,
  • Jinfeng Zhang,
  • Qinghe Zhang,
  • Qichen Lin,
  • Xiaofeng Li,
  • Jianjun Yu

摘要

Purpose

This study aims to develop an integrated water and sediment remediation system, based on Sediment Microbial Fuel Cells (SMFCs) principles, complemented by ecological floating islands, to facilitate the deployment of SMFCs technology in engineering-scale projects.

Materials and methods

In this paper, an SMFC device combined with an ecological floating island was constructed. Through laboratory-scale and production-scale experiments, the application methods and restoration effects of SMFCs in urban river ecological restoration projects were explored.

Results and discussion

The device constructed in this study could operate stably in both laboratory-simulated environments and eutrophic urban rivers. The results showed that, in terms of power generation performance, compared with the device without an ecological floating island, the operating voltage of the ecological floating island-SMFC increased by 3.26 times, and the power density increased by 10.21 times. In terms of pollutant removal, the COD, NH3-N, TN, and TP in the water body were greatly affected by the upstream water, while the removal effects of TN and TOC in the sediment and the P fixation effect were significant. In terms of microbial community changes, the species diversity and abundance near the anode of the SMFCs device increased, among which Desulfobacterota and Proteobacteria were the dominant phyla, and the ecological floating island changed the microbial community structure.

Conclusions

An ecological floating island has a certain promoting effect on the performance of SMFCs, which indicates promise for the application of SMFCs on a large scale.