MESSAI.iO

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A microbial fuel cell (MFC) was designed and operated for 30 days to evaluate its performance in resource recovery and bioelectricity generation from slaughterhouse wastewater. The system yielded an average power density of 465 mW m⁻² and a maximum reduction in COD of 90%. The MFC also achieved a phosphorus recovery of 40% as struvite.

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Literature priors

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Distribution

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Coulombic efficiency2%

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What they did

System
MFC

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Abstract

Abstract BACKGROUND The microbial fuel cell (MFC) is a potential cost‐effective technology for the energy‐neutral treatment of wastewater. However, the successful implementation of this technology in resource recovery is still limited. In this study, a microbial electrochemical cell was designed and operated for 30 days. Critical factors for removal and recovery of nitrogen and phosphorus as struvite from wastewater were assessed. RESULTS Optimization studies on critical factors such as the chemical oxygen demand (COD) of wastewater (500–2000 mg L −1 ) and cathode aeration rate (45–135 mL min −1 ) were conducted using a pure culture of Escherichia coli . The system yielded an average power density of 465 mW m −2 , average current density of 915 mA m −2 and phosphorus recovery at an extent of 40% as struvite. Additionally, a maximum reduction in the COD of 90% with an average coulombic efficiency of about 82% was obtained at a short interval of 30 days. Solubility studies of the recovered struvite for 12 h at different pH values from 4.5 to 9 showed a maximum solubility of 80% at pH 4.5 and a minimum of 3.5% at pH 9. CONCLUSION This study moves one step closer to applying MFC technology for nitrogen‐ and phosphorus‐rich wastewater treatment with concurrent struvite precipitation and electricity production. In this way, Sustainable Development Goals 2, 6 and 7 can be achieved through resource recovery, clean water and bioenergy. © 2024 Society of Chemical Industry (SCI).

Key findings

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Keywords

StruviteMicrobial fuel cellWastewaterResource recoveryWaste managementResource (disambiguation)

Identifiers

DOI
10.1002/jctb.7660
Journal
Journal of Chemical Technology & Biotechnology
Year
2024