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This MFC study A membrane-less and mediator-less system was designed and tested with wastewater sample as fuel to generate electricity. Microorganisms were first isolated from the wastewater sample to pure culture and were used as the ‘machinery’ that converts wastewater into energy.

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What they did

System
MFC

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Abstract

A membrane-less and mediator-less system was designed and tested with wastewater sample as fuel to generate electricity. Microorganisms were first isolated from the wastewater sample to pure culture and were used as the ‘machinery’ that converts wastewater into energy. The wastewater samples were treated either by sterilization or non-sterilization methods. These tests were run using a modified air-cathode single chamber microbial fuel cell (MFC). By sterilizing the wastewater, the calculated power density was much lower compared to non-sterilized wastewater indicating a significant role of microbial activity in the SCMFC system and substrate availability. Furthermore, mixed culture was observed to give larger power density compared to an individual microbe (18.42 ± 5.84 mW/m 2 for mixed culture and 8.82 ± 4.56 mW/m 2 to 9.46 ± 4.87 mW/m 2 for individual microbe, Bukholderi capecia and Acidovorax sp . respectively) to prove that larger power value could be achieved with a mixed microbial system. In addition, the system proved to remove 68.57% of chemical oxygen demand (COD) of the wastewater sample tested. In conclusion, the designed SCMFC has been proven capable of power generation and wastewater treatment comparable to other SCMFCs to date.

Key findings

  • 84 mW/m² for mixed culture and 8.
  • 56 mW/m² to 9.
  • 87 mW/m² for individual microbe, Bukholderi capecia and Acidovorax sp.
  • respectively) to prove that larger power value could be achieved with a mixed microbial system.
  • 57% of chemical oxygen demand (COD) of the wastewater sample tested.

Keywords

Microbial fuel cellWastewaterSewage treatmentChemical oxygen demandSterilization (economics)Pulp and paper industry

Identifiers

DOI
10.4028/www.scientific.net/amr.1113.823
Journal
Advanced Materials Research
Year
2015