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A membraneless microbial fuel cell (ML-MFC) system was developed to enhance electricity generation and wastewater treatment efficiency, achieving high electric production using acetate wastewater.

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What they did

System
MFC

What worked

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Abstract

Microbial fuel cell (MFC) is a new proposed technology reported to generate renewable energy while simultaneously treating wastewater. Membraneless microbial fuel cell (ML-MFC) system was developed to eliminate the requirement of membrane which is expensive and prone to clogging while enhancing electricity generation and wastewater treatment efficiency. For this purpose, a reactor was designed in two chambers and connected via three pipes (1 cm in diameter) to enhance fluid diffusion. Influent flowrate was maintained by adjusting peristaltic pump at the base of anaerobic chamber. Carbon cloth (235 cm²) was used as anode and paired with gas diffusion layer (GDL) carbon-Pt as cathode. Anaerobic sludge was filtered and used as starter feed for the anaerobic chamber. The experiment was carried out by feeding synthetic wastewater to anaerobic chamber; while current response and potential were recorded. Performance of reactor was evaluated in terms of chemical oxygen demand (COD). Electroactive microbe was inoculated from anaerobic sludge and showed current response (0.55-0.65 mA) at 0,35 V, range of diameter 1.5-2 µm. The result of microscopics can showed three different species. The microbial performance was increased by adding ferric oxide 1 mM addition as acceptor electron. The reactor was able to generate current, voltage, and electricity power of 0.36 mA, 110 mV, and 40 mWatt (1.5 Watt/m2), respectively, while reaching COD removal and maximum coulomb efficiency (EC) of 16% and 10.18%, respectively.

Key findings

  • The ML-MFC system showed a current response of 0.55-0.65 mA at 0.35 V, indicating the presence of electroactive microorganisms.
  • The system was able to treat synthetic wastewater, reducing chemical oxygen demand (COD) levels.
  • Three different species of electroactive microorganisms were identified through microscopic analysis, with a diameter range of 1.5-2 µm.

Keywords

Microbial fuel cellAnodeWastewaterChemical oxygen demandPulp and paper industryCathode

Identifiers

DOI
10.21771/jrtppi.2020.v11.no2.p19-27
Journal
Jurnal Riset Teknologi Pencegahan Pencemaran Industri
Year
2020