Microbial Power Generator Using Exhaust Gas Cathode
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Solution Overview
Problem
Conventional microbial power generators have low power generation efficiency, ranging from 50 to 150 W/m3 per 1 m3 of the anode, necessitating a method to enhance this efficiency using simple and inexpensive means.
Innovation Solution
The method involves using a microbial power generator with an anode chamber and a cathode chamber separated by an ion-permeable nonconductive membrane, where an oxygen-containing gas, including biologically treated exhaust gas, is fed to the cathode chamber, with carbon dioxide and water vapor being added to enhance ion transport and power generation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional air cathodes are used with simple air distribution, then device complexity is reduced and ease of operation is improved, but power generation efficiency remains low (50-150 W/m3)
Solution Approach 1:
The patent applies multi-functionality by using biologically treated exhaust gas to serve multiple purposes simultaneously: providing oxygen for the cathode reaction, supplying carbon dioxide to enhance ion transport through the membrane, and adding water vapor to maintain humidity. This eliminates the need for separate systems for oxygen supply, CO2 injection, and humidification, thereby increasing power generation efficiency without proportionally increasing device complexity
Solution Approach 2:
The patent changes the composition parameters of the gas supplied to the cathode chamber by using biologically treated exhaust gas instead of pure air. This gas contains not only oxygen but also carbon dioxide and water vapor, which alter the chemical and physical parameters of the cathode environment to enhance ion transport and power generation efficiency
2Productivity
If biologically treated exhaust gas is used as the oxygen-containing gas, then cost is reduced and power generation efficiency is improved, but gas composition control becomes more complex
Solution Approach 1:
The patent applies self-service by utilizing biologically treated exhaust gas that is already produced within the system. The exhaust gas from the biological treatment process is directly fed to the cathode chamber without requiring external gas sources or complex composition adjustment systems. The system uses its own byproduct (exhaust gas) to enhance its performance, eliminating the need for external oxygen and CO2 supply systems
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
This approach significantly increases power generation efficiency by promoting ion transport through the membrane, with biologically treated exhaust gas providing a cost-effective and efficient means to enhance power output, achieving efficiencies up to 255 W/m3.
Implementation Method 1
a cathode chamber (3) having a cathode (5) which contacts an ion-permeable nonconductive membrane (2), the ion-permeable nonconductive membrane (2) separating the cathode chamber (3) from the anode chamber (4)
Implementation Method 2
wherein the oxygen-containing gas includes a biologically treated exhaust gas... promoting ion transport through the membrane
Data Source
AI summary
The power generation efficiency of a microbial power generator is increased by using an easy and inexpensive unit. Two plate-like cation-exchange membranes are disposed in parallel in a tank. This arrangement allows an anode chamber to be formed between the cation-exchange membranes. Two cathode chambers are separated from the anode chamber by using the respective ion-permeable nonconductive membranes. An oxygen-containing gas is made to pass through the cathode chamber. An anode solution is supplied to the anode chamber, and, preferably, the anode solution is made to circulate. A biologically treated exhaust gas is used as the oxygen-containing gas to be supplied to the cathode chamber. Carbon dioxide in the biologically treated exhaust gas can promote transport of Na+ and K+ ions, and water vapor can increase the ion permeability, thereby increasing the power generation efficiency.