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A novel membrane-less microbial fuel cell (ML-MFC) was developed for efficient wastewater treatment, achieving high removal efficiencies of COD, NH4+-N, and TN, and generating electricity.

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What they did

System
MFC

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Abstract

Abstract A novel membrane‐less microbial fuel cell (ML‐MFC) which used the baffles instead of the ion exchange membrane (IEM) was developed for ammonium‐containing wastewater treatment and electricity generation. By means of installing an ideal nitrifying unit between the anodic and cathodic chamber, the novel ML‐MFC accomplished organics degradation and nitrogen removal without additional loop. The removal efficiencies of COD, NH 4 + −N and TN achieved 97.07±0.47 %, 91.76±3.32 % and 87.66±1.59 %, respectively. Meanwhile, the effluent pH was near neutral and turbidity was quite low. In addition, the maximum power density of 1.007±0.032 W/m 3 was obtained. Combined with the analysis of microbial community, electroactive bacteria (EAB) Desulfovibrio , Comamonas and Thiobacillus were enriched in biofilm. Considering the superior effluent quality and the promising energy potential, the novel ML‐MFC has good application prospects in efficient and sustainable wastewater treatment.

Key findings

  • 97.07±0.47 % removal efficiency of COD
  • 91.76±3.32 % removal efficiency of NH4+-N
  • 87.66±1.59 % removal efficiency of TN
  • Maximum power density of 1.007±0.032 W/m³
  • Enrichment of electroactive bacteria (EAB) Desulfovibrio, Comamonas, and Thiobacillus in biofilm

Keywords

Microbial fuel cellWastewaterEffluentPulp and paper industrySewage treatmentAmmonium

Identifiers

DOI
10.1002/elan.201800232
Journal
Electroanalysis
Year
2018