Benthic Microbial Fuel Cell Oxygen Barrier
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Solution Overview
Problem
Existing oceanographic monitoring systems face challenges in long-term, self-powered data collection due to bio-fouling issues with mechanical power generation methods, requiring innovative non-mechanical solutions to maintain an anoxic environment for benthic microbial fuel cells and prevent oxygen exposure.
Innovation Solution
A remotely-deployed benthic microbial fuel cell system utilizing a graphite anode and interlocking radially mounted asymmetric rubber flukes, forming a flexible and impermeable oxygen barrier around the anode, which can adapt to uneven ocean bottoms and resist ocean currents, ensuring an anoxic environment and preventing oxygen exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If mechanical power generation methods are used, then power can be generated, but bio-fouling occurs on moving parts
Solution Approach 1:
The patent replaces mechanical power generation systems with a benthic microbial fuel cell that uses biochemical reactions to generate electricity. The system employs an anode embedded in the sediment, a cathode in the water column, and microbial communities to convert chemical energy from organic matter into electrical energy, eliminating moving parts and bio-fouling issues associated with mechanical generators.
2Power
If the anode is exposed to oxygenated water, then power generation is inhibited, but maintaining an anoxic environment is challenging
Solution Approach 1:
The system divides the environment into distinct zones: an anoxic zone at the sediment-water interface where the anode is embedded, and an oxygenated zone in the water column where the cathode is positioned. The anode chamber is segmented off from oxygenated water using a barrier or mesh structure, allowing the system to maintain the required anoxic conditions for microbial fuel cell operation while still accessing oxygen at the cathode.
Solution Approach 2:
The patent introduces an intermediary structure (such as a barrier, mesh, or selective membrane) between the anode chamber and the oxygenated water. This intermediary allows the system to maintain separation between oxygen and the anode while permitting water flow and nutrient exchange, thus protecting the anoxic environment without completely isolating the system.
3Duration of action of stationary object
If long-term deployments are implemented, then continuous data collection is achieved, but power sustainability becomes critical
Solution Approach 1:
The benthic microbial fuel cell is designed to be self-powered, using naturally occurring organic matter in the sediment as fuel. The microbial communities on the anode surface continuously metabolize organic substrates, generating electricity without requiring external power sources, fuel replenishment, or mechanical intervention, thereby enabling sustained long-term operation.
Solution Approach 2:
The system maintains continuous power generation by keeping the anode permanently embedded in the sediment and the cathode continuously exposed to oxygenated water. The biochemical reactions occur continuously as long as organic matter is available, providing a steady, uninterrupted power supply for long-term deployments without periodic interruptions for refueling or maintenance.
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
The solution enables reliable, long-term power generation and data collection without diver or ROV assistance, maintaining an anoxic environment around the anode and achieving higher power production compared to traditional systems, as demonstrated by successful test deployments.
Implementation Method 1
Benthic microbial fuels cells (BMFCs) are a non-mechanical method for generating power that use a bio-chemical process to develop a voltage potential across electrodes in the seafloor sediment and in the free stream seawater
Implementation Method 2
an anode that is mounted to the bottom portion of the base unit, the anode is: embedded in the bottom of the body of water when the self-embedded bottom mooring is deployed, and isolated from oxygenated water in an anoxic chamber by the plurality of flukes when in the deployed position
Data Source
AI summary
A remotely-deployed benthic microbial fuel cell is provided, as well as a method for deploying the benthic microbial fuel cell. The remotely-deployed benthic microbial fuel cell has a mooring that includes a base unit, and a plurality of flukes mounted to a perimeter of a bottom portion of the base unit, the plurality of flukes being preconfigured to automatically move from a stored position to a deployed position. The benthic microbial fuel cell includes an anode that is mounted to the bottom portion of the base unit, and isolated from oxygenated water in an anoxic chamber by the plurality of flukes when in the deployed position. The benthic microbial fuel cell further includes a cathode that is attached to the base unit outside the anoxic chamber, where the cathode stays in oxygenated water when the remotely-deployed bottom mooring is deployed.