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Impacts of bioturbation from tubificidae on the electrochemical performance and microbial community of sediment microbial fuel cells

Lookup NU author(s): Professor Eileen Yu

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Abstract

© 2019, ALÖKI Kft., Budapest, Hungary. Sediment microbial fuel cells (SMFCs) have been examined extensively for bioremediation, but the impact of organisms that live in the sediment has not been previously investigated. In this study, the impacts from the bioturbation of Tubificidae on the electrochemical performance and microbial community of SMFCs were investigated using lake water and sediment. It was observed that Tubificidae were burrowing in the sediment and eventually dwelled on the anode of SMFCs. Although the voltage output of the SMFC in the presence of Tubificidae experienced a dramatic decline at the beginning of operation, it outperformed that of the SMFC in the absence of Tubificidae after operating for 30 days. The polarization curves of the SMFC anode and Shannon diversity index suggested that the anodic biofilm was devoured by Tubificidae. However, the cathode performance was improved due to more chemical oxygen demand (COD) and ammonia-nitrogen (NH3-N) released from the sediment. After 90 days of operation, a high loss on ignition (LOI) removal efficiency of 24.5 ± 3% was achieved by combining the anodic oxidation of SMFC and the ingestion of Tubificidae. This study shows that SMFCs can alleviate the impact of Tubificidae on pollutants transfer to overlying water and still remove organic matters from the sediment effectively.


Publication metadata

Author(s): Xu P, Wang HP, Wang X, Yang WL, Yu EH, Yan XJ

Publication type: Article

Publication status: Published

Journal: Applied Ecology and Environmental Research

Year: 2019

Volume: 17

Issue: 4

Pages: 9247-9261

Print publication date: 01/07/2019

Acceptance date: 17/05/2019

ISSN (print): 1589-1623

ISSN (electronic): 1785-0037

Publisher: Corvinus University of Budapest

URL: https://doi.org/10.15666/aeer/1704_92479261

DOI: 10.15666/aeer/1704_92479261


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