Microbial Sensor System Using Voltage Measurements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microbial sensor technologies face challenges such as reactor design limitations, sensitivity issues, and difficulty in reconfiguring designs to match site conditions, making them unsuitable for monitoring various environments like sediments, soils, and groundwater.
Innovation Solution
The development of microbial sensor systems that utilize open-circuit voltage and recovery voltage measurements, combined with a reconfigurable design and a reversible cathode, allows for sensitive detection of substrate concentrations and redox conditions in diverse environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current measurement is used to determine microbial activity, then the sensor can provide quantitative data, but the sensitivity is not enough to measure desired microbial activity
Solution Approach 1:
The patent introduces an intermediary measurement approach by using voltage measurements as a mediator between the microbial fuel cell system and the substrate concentration determination. Instead of directly measuring current which has insufficient sensitivity, the system measures voltage (open-circuit voltage and recovery voltage) which provides enhanced sensitivity while still correlating to microbial activity and substrate concentration through the electrochemical relationships in the MFC system.
2Adaptability or versatility
If reactor design is used for analytical applications, then substrate concentration can be determined, but reconfiguration to match site conditions is difficult
Solution Approach 1:
The patent applies segmentation by dividing the reactor design into modular components that can be independently configured. The system separates the anode chamber, cathode chamber, and measurement components into discrete units that can be reconfigured based on site conditions. This modular approach allows the sensor to be adapted to different environments (sediments, soils, groundwater) without redesigning the entire system, reducing the complexity of reconfiguration while maintaining adaptability.
Solution Approach 2:
The patent implements dynamics by making the reactor design flexible and adjustable rather than fixed. The system allows for dynamic reconfiguration of chamber volumes, electrode positions, and flow rates to match varying site conditions. This dynamic capability enables the same basic design to serve multiple analytical applications across different environmental matrices without requiring complex custom designs for each site.
3Power
If reactor design is optimized for energy production, then power output is maximized, but the design is not suitable for analytical sensing applications
Solution Approach 1:
The patent applies universality by designing a microbial fuel cell system that can serve multiple functions - both energy production and analytical sensing. The same MFC architecture, electrodes, and microbial community can operate in energy production mode (maximizing power output) or be switched to analytical sensing mode (optimizing for voltage measurements and substrate concentration determination). This multi-functionality eliminates the need for separate optimized designs for each application while maintaining performance in both modes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These systems provide sensitive and real-time monitoring of microbial activity and substrate concentrations, enabling effective characterization of natural and contaminated environments, including wastewater treatment facilities, with improved sensitivity and adaptability.
Implementation Method 1
The analytical sensors using microbial fuel cells typically measure the flow of current between the anode and cathode as the metric for determining substrate concentrations and other analytical parameters
Implementation Method 2
Exemplary sensor systems can be used to, for example, determine: 1) redox conditions using open-circuit voltage measurements, and 2) substrate concentrations performing recovery voltage measurements
Implementation Method 3
The analytical sensors using microbial fuel cells typically measure the flow of current between the anode and cathode as the metric for determining substrate concentrations and other analytical parameters (e.g., biological oxygen demand, BOD)
Implementation Method 4
Microbial fuel cells were developed for the conversion of waste products (sewage, farming wastes, etc.) into electrical energy
Implementation Method 5
substrate concentrations performing recovery voltage measurements
Data Source
AI summary
A microbial sensor, system and method that can be used to determine the chemical environment and/or substrate concentrations in saturated and unsaturated natural and environments, such as soils, aquifers and sediments are disclosed. The system may be used for monitoring municipal and industrial treatment facilities and sites where chemicals or contaminants were released to natural environments. The electrochemical microbial sensor system can be referenced using either a cathode exposed to oxygen or a reference cell (silver/silver chloride or calomel) for monitoring natural or man-made environments.