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This study optimized MFCs for energy production and organic matter removal using primary effluent wastewater and anaerobic sludge as substrate, identifying optimal parameters for electrode material, size, salt bridge diameter, and salt solution concentration.

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Extraction

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What they did

System
MFC

What worked

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Abstract

In this study, four double-chambered Microbial fuel cells (MFCs) operated by primary effluent wastewater mixed with anaerobic sludge as substrate, was designed, built, and optimized for better higher energy production and subsequently better removal of organic matter. Optimized MFCs operating parameters as a function of energy produced include electrode material type, electrode size, salt bridge diameter, type of salt solution that used in salt bridge, and concentration of the salt solution used in the salt bridge. Three duplicates-MFCs for each parameter value were used. Output open-circuit voltage (OCV) was measured for each MFC one time daily and for one week for each tested operating parameter. Data obtained showed that (i) MFCs with copper electrodes produce output voltage significantly higher than MFCs with carbon brushes electrodes which, in turn, achieved output voltage significantly higher than both that achieved by MFCs with zinc electrodes and MFCs with manufactured carbon electrodes, (ii) MFCs with 10 mm salt bridge shown significantly higher output voltage than MFCs with both 16 and 24 mm salt bridges, (iii) KCl salt bridge in MFCs is significantly more efficient than NaCl salt bridges, and (iv) MFCs with 1M KCl salt bridges can produce output voltage significantly higher than that produced by MFCs with 3M KCl salt bridges.

Key findings

  • MFCs with copper electrodes produced higher output voltage than those with carbon brushes, zinc, or manufactured carbon electrodes.
  • MFCs with 10 mm salt bridges showed higher output voltage than those with 16 or 24 mm salt bridges.
  • KCl salt bridges were more efficient than other salt solutions.

Keywords

MFCextracted

Identifiers

Journal
of Environmental Science and Engineering Technology, 2021, 9, 27-36 27
Year
2019