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This MDC study bioelectrochemical systems are emerging as a promising and friendly alternative to convert the energy stored in wastewater directly into electricity by microorganisms and utilize it in situ to drive desalination. To better understand such processes, we propose the development of an anoxic biocathode microbial desalination Cell for the conversion of carbon- and nitrogen-rich wastewaters into bioenergy and to perform salt removal.

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What they did

System
MDC

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Abstract

Bioelectrochemical systems are emerging as a promising and friendly alternative to convert the energy stored in wastewater directly into electricity by microorganisms and utilize it in situ to drive desalination. To better understand such processes, we propose the development of an anoxic biocathode microbial desalination Cell for the conversion of carbon- and nitrogen-rich wastewaters into bioenergy and to perform salt removal. Our results demonstrate a power output of 0.425 W m⁻³ with desalination, organic matter removal and nitrate conversion efficiencies of 43.69, 99.85 and 92.11% respectively. Microbiological analysis revealed Proteobacteria as the dominant phylum in the anode (88.45%) and biocathode (97.13%). While a relatively higher bacterial abundance was developed in the anode chamber, the biocathode showed a greater variety of microorganisms, with a predominance of Paracoccus (73.2%), which are related to the denitrification process. These findings are promising and provide new opportunities for the development and application of this technology in the field of wastewater treatment to produce cleaner water and conserve natural resources.

Key findings

  • 425 W m⁻³ with desalination, organic matter removal and nitrate conversion efficiencies of 43.
  • 85 and 92.
  • 11% respectively.
  • 45%) and biocathode (97.
  • 13%).

Keywords

Anoxic watersDesalinationWastewaterSewage treatmentDenitrificationMicrobial fuel cell

Identifiers

DOI
10.2166/wst.2020.134
PubMed
32385209
Journal
Water science and technology : a journal of the International Association on Water Pollution Research
Year
2019