Bacterial CO2 Conversion to Organic Acids
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Solution Overview
Problem
Coal-fired power plants emit significant amounts of carbon dioxide, and existing methods to reduce emissions, such as carbon sequestration, are costly and impractical, while attempts to convert CO2 into methane or biogas create additional regulatory and handling challenges.
Innovation Solution
A system using a liquid-gas contact unit with specific bacterial strains like Pediococcus and Propionibacterium to convert CO2 into short-chain organic acids like acetic, butyric, and lactic acid, reducing CO2 concentrations without producing methane or other biogas, thereby simplifying emissions reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If carbon dioxide is converted into methane or biogas, then carbon dioxide emissions are reduced, but regulatory handling and disposal complexities increase
Solution Approach 1:
The patent changes the product parameter from methane/biogas to short-chain organic acids (acetic, butyric, propionic acid). This parameter change fundamentally alters the regulatory status - organic acids are not subject to the same stringent methane regulations, thereby reducing handling complexity while still achieving CO2 reduction
Solution Approach 2:
The patent converts the harmful CO2 emissions into useful short-chain organic acids that can be applied as fertilizers or industrial chemicals. This transforms the waste product into a beneficial substance, simultaneously achieving emission reduction and creating economic value without the regulatory burdens associated with biogas
2Quantity of substance
If carbon sequestration and storage methods are implemented, then carbon dioxide emissions are reduced, but implementation costs increase
Solution Approach 1:
The system uses naturally occurring bacteria (Pediococcus, Propionibacterium) that self-propagate and perform the CO2 conversion function. The bacteria utilize the CO2 itself as a carbon source for growth and acid production, eliminating the need for external carbon sources or complex supplementation systems, thereby reducing operational costs
Solution Approach 2:
The patent converts CO2 waste into valuable short-chain organic acids that have market applications as fertilizers and industrial chemicals. This creates a revenue stream that can offset operational costs, making the system economically viable compared to pure sequestration approaches that incur only costs
3Quantity of substance
If bacterial strains are used to produce organic acids from carbon dioxide, then carbon dioxide concentration is reduced, but system complexity increases
Solution Approach 1:
The bacterial system performs multiple functions simultaneously: CO2 consumption, bacterial growth, and organic acid production. The CO2 serves dual purposes as both a carbon source for bacterial metabolism and a substrate for acid production, eliminating the need for separate carbon supplementation systems
Solution Approach 2:
The bacteria act as a biological intermediary that facilitates the conversion of CO2 to organic acids. This biological mediator simplifies the overall process by using enzymatic pathways naturally present in the bacteria, avoiding the need for complex chemical catalysts or multi-step synthetic processes
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
Effectively reduces CO2 concentrations by up to 57% in a single pass through the system, producing valuable organic acids while avoiding the complexities and regulatory issues associated with biogas production.
Implementation Method 1
a bacterial strain disposed in the liquid-gas contact unit, where the bacterial strain reduces a concentration of carbon dioxide in the gas stream (e.g., by at least 10%), and produces one or more organic acids therefrom
Implementation Method 2
the bacteria of the bacterial strain are present within the liquid-gas contact unit to consume carbon dioxide from the gas stream and to produce one or more organic acids therefrom
Data Source
AI summary
Methods and systems for producing short carbon chain weak organic acids (e.g., acetic acid) from a gas stream rich in carbon dioxide. The systems include a liquid-gas contact unit a flue gas desulfurization unit), and a bacterial strain disposed in the liquid-gas contact unit. The bacterial strain reduces a concentration of carbon dioxide in the gas stream, and produces one or more organic acids (e.g., acetic acid, butyric acid, propionic acid, lactic acid, or combinations thereof). Related methods include providing a gas stream rich in carbon dioxide, introducing the gas stream into a liquid-gas contact unit, preparing an inoculum comprising a bacterial strain adapted to produce organic acid(s) from the carbon in the gas stream, and inoculating the liquid-gas contact unit with first amount of the inoculum such that the bacteria therein consume carbon dioxide from the gas stream, producing the organic acid(s).