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A study on photosynthetic microbial fuel cells (PMFCs) found that co-cultivation of bacteria and microalgae significantly improved electrochemical performance, with a maximum open-circuit voltage of 397.95 ± 31.53 mV, current density of 49.33 ± 0.36 mA/m³, and power density of 0.78 ± 0.01 mW/m³.

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System
MSC
Substrate
real wastewater

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Abstract

This study investigates the effect of microbial configuration on the electrochemical performance of photosynthetic microbial fuel cells (PMFCs). The PMFC configuration incorporating both bacteria and microalgae exhibited the highest open-circuit voltage (OCV) of 397.95 ± 31.53 mV, significantly higher than that of the OCVs obtained in the sterile control (C1) and the microalgae-only configuration (C2), which were 32.47 ± 22.43 mV and 284.59 ± 12.63 mV, respectively. Furthermore, the PMFC containing only microalgae achieved a current density (CD) of 20.96 ± 0.18 mA/m³ and a power density (PD) of 0.40 ± 0.01 mW/m³ under room temperature conditions. Notably, the combined bacteria and microalgae configuration demonstrated a substantial performance improvement, yielding a significantly higher CD of 49.33 ± 0.36 mA/m³ and PD of 0.78 ± 0.01 mW/m³ at room temperature. This configuration also achieved a maximum decolorization of 93.57 ± 0.10% with a corresponding algal biomass recovery of 134.90 ± 2.69 mg/L. These findings highlighted the critical role of microbial composition in PMFC performance. The combination of bacteria and microalgae yielded superior results compared to other configurations under the investigated conditions.

Key findings

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Keywords

Microbial fuel cellPhotosynthesisBacteriaFuel cellsBiochemical engineeringBiotechnology

Identifiers

DOI
10.21924/cst.9.1.2024.1372
Journal
Communications in Science and Technology
Year
2024