Abstract
Photosynthetic microbial fuel cell (PMFC) is a novel technology, which employs organic pollutants and organisms to produce electrons and biomass and capture CO2 by bio-reactions. In this study, a new PMFC was developed based on Synechococcus sp. as a biocathode, and dairy wastewater was used in the anode chamber. Different experiments including batch feed mode, semi-continuous feed mode, Synechococcus feedstock to the anode chamber, Synechococcus-Chlorella mixed system, the feedstock of treated wastewater to the cathode chamber, and use of extra nutrients in the anodic chamber were performed to investigate the behavior of the PMFC system. The results indicated that the PMFC with a semi-continuous feed mode is more effective than a batch mode for electricity generation and pollutant removal. Herein, maximum power density, chemical oxygen demand removal, and Coulombic efficiency were 6.95 mW/m2 (450 Ω internal resistance), 62.94, and 43.16%, respectively, through mixing Synechococcus sp. and Chlorella algae in the batch-fed mode. The maximum nitrate and orthophosphate removal rates were 98.83 and 68.5%, respectively, wherein treated wastewater in the anode was added to the cathode. No significant difference in Synechococcus growth rate was found between the cathodic chamber of PMFC and the control cultivation cell. The heating value of the biocathode biomass at maximum Synechococcus growth rate (adding glucose into the anode chamber) was 0.2235 MJ/Kg, indicating the cell’s high ability for carbon dioxide recovery. This study investigated not only simultaneous bioelectricity production and dairy wastewater in a new PMFC using Synechococcus sp. but also studied several operational parameters and presented useful information about their effect on PMFC performance.
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The authors would like to thank the authorities of the University of Tehran for technical and financial support.
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This research was supported by the Faculty of Environment and the Green Technology Laboratory (GTL) at the School of Chemical Engineering, University of Tehran.
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Sahar Khodadi: conceptualization, methodology, validation, formal analysis, investigation, resources, data curation, writing—original draft.
Abdolreza Karbassi: conceptualization, methodology, validation, formal analysis, resources, data curation, writing—original draft.
Omid Tavakoli: conceptualization, methodology, validation, formal analysis, investigation, resources.
Majid Baghdadi: conceptualization, validation, formal analysis, investigation, resources, data curation, writing—original draft.
Zeinab Zare: validation, formal analysis, investigation, data curation, writing—original draft.
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Khodadi, S., Karbassi, A., Tavakoli, O. et al. Simultaneous dairy wastewater treatment and bioelectricity production in a new microbial fuel cell using photosynthetic Synechococcus. Int Microbiol 26, 741–756 (2023). https://doi.org/10.1007/s10123-023-00328-2
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DOI: https://doi.org/10.1007/s10123-023-00328-2