MESSAI.iO

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A constructed wetland integrated with microbial fuel cell (CW-MFC) system was developed for melanoidin removal from palm oil mill effluent (POME) and simultaneous electricity generation. The system achieved high melanoidin removal rates and generated electrical energy as a by-product. This study demonstrates the potential of CW-MFC systems for biological treatment of melanoidin-rich wastewater.

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Literature priors

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Distribution

Reported parameters

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Coulombic efficiency3.59%

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What they did

System
MFC
Substrate
synthetic mixture
Inoculum
Bacillus lichenformis

What worked

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Abstract

Melanoidin is the main cause of the dark brown color of the palm oil mill effluent (POME) that form under the Maillard reaction. In this study, the constructed wetland integrated with microbial fuel cell (CW-MFC) has been developed for melanoidin removal from the POME and simultaneously electricity generation as a by-product. The macrophyte Dieffenbachia sp. has been used as a biocatalyst on the cathode electrode and the oxidoreductase-producing bacterium Bacillus lichenformis with laccase and manganese peroxidase activity has been used as an anodic biocatalyst. The maximal melanoidin removal, chemical oxygen demand (COD) removal, enzyme activity, and power output were monitored. The maximal laccase and manganese peroxidase activities of 1.60 ± 0.10 U/mL and 1.45 ± 0.05 U/mL were found during melanoidin degradation. In addition, the maximal melanoidin removal of 93.59 ± 0.10% and 95.12 ± 0.15% were achieved respectively. When the maximal power density of 0.18 ± 0.01 mW/m³ was generated. This study gained new knowledge about using the CW-MFC system as a biological treatment process of the melanoidin content in the POME and simultaneously generated electrical energy as a by-product. HIGHLIGHTS The coupling process of constructed wetland and the microbial fuel cell is promising for the melanoidin removal of the POME The maximal melanoidin removal of 93.59 % was gained The maximal power output of 0.18 mW/m³ was generated from this system GRAPHICAL ABSTRACT

Key findings

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Keywords

MelanoidinPulp and paper industryMicrobial fuel cellBioenergyChemical oxygen demandFood science

Identifiers

DOI
10.48048/tis.2023.5490
Journal
Trends in Sciences
Year
2023