Novel BOD (biological oxygen demand) sensor using mediator-less microbial fuel cell

Area of Science:

• Environmental Science
• Electrochemistry
• Biosensor Technology

Background:

• Accurate measurement of Biochemical Oxygen Demand (BOD) is crucial for wastewater quality assessment.
• Existing BOD monitoring methods can be time-consuming or require frequent maintenance.
• Microbial fuel cells (MFCs) offer a potential platform for developing robust biosensors.

Purpose of the Study:

• To develop and evaluate a microbial fuel cell (MFC) based biosensor for determining wastewater BOD.
• To assess the stability and longevity of the MFC biosensor.
• To establish the correlation between BOD values and the electrical output (coulombs) generated by the biosensor.

Main Methods:

• Utilized a microbial fuel cell (MFC) configured as a biosensor.
• Measured the electrical output (coulombs) generated by the MFC in response to varying wastewater BOD levels.
• Monitored the operational stability and maintenance requirements of the biosensor over an extended period.

Main Results:

• The MFC biosensor demonstrated a clear and strong correlation between the measured BOD values and the coulombs produced.
• The biosensor maintained stable operation for over five years.
• No servicing was required during the five-year operational period, highlighting its exceptional durability.

Conclusions:

• A microbial fuel cell biosensor is an effective tool for reliable BOD determination in wastewater.
• The developed MFC biosensor offers significantly enhanced operational stability and longevity compared to previously reported BOD biosensors.
• This technology presents a low-maintenance and durable solution for continuous wastewater quality monitoring.