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Osmotic microbial fuel cells (OsMFCs) with different forward osmosis membranes were tested for electricity generation and pollutant removal from landfill leachate, with the best performance achieved by the OsMFC with CTA-ES membrane.

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What they did

System
MFC

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Abstract

Abstract In this study, thin-film composite with embedded polyester screen (TFC-ES), cellulose triacetate with a cast nonwoven (CTA-NW) and cellulose triacetate with embedded polyester screen (CTA-ES) were examined as the intermediate membranes in osmotic microbial fuel cells (OsMFCs). The reactors were fed with actual landfill leachate and the performance was studied in two operation modes: active layer facing draw solution (AL-DS) and active layer facing feed solution (AL-FS). The OsMFC with CTA-ES exhibited the best energy generation (maximum power density: 0.44 W m -2 ) and pollutant removal efficiency (ammonia nitrogen: 70.12 ± 0.28%, total nitrogen: 74.04 ± 0.33%) in the AL-FS mode, which could be ascribed to the lowest internal resistance (236.75 ohm) and highest microbial richness. Pseudomonas was the highest proportion of microbial in OsMFCs. The results of this study has demonstrated the potential of OsMFCs for landfill leachate treatment.

Key findings

  • The OsMFC with CTA-ES exhibited the best energy generation (maximum power density: 0.44 W m⁻²) and pollutant removal efficiency (ammonia nitrogen: 70.12 ± 0.28%, total nitrogen: 74.04 ± 0.33%) in the AL-FS mode.
  • The lowest internal resistance (236.75 ohm) and highest microbial richness were observed in the OsMFC with CTA-ES.
  • Pseudomonas was the highest proportion of microbial in OsMFCs.

Keywords

Cellulose triacetateLeachateMicrobial fuel cellMembranePolyesterForward osmosis

Identifiers

DOI
10.21203/rs.3.rs-66054/v2
Journal
Research Square
Year
2020