Acetogen Fermentation with Methanol for CO2-Free Waste Gas
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Solution Overview
Problem
Biorefinery processes using syngas as a substrate face challenges due to low solubility issues, leading to low microorganism growth and metabolism rates, resulting in relatively low reaction rates and production efficiency compared to chemical conversion processes.
Innovation Solution
Incorporating methanol into the fermentation process with microbial strains in a bioreactor, where gaseous substrates such as CO, H2, and CO2 are converted into hydrocarbon products, maximizing substrate consumption and converting all CO2 into hydrocarbon products like acetate and butyrate without additional separation or purification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If syngas is used as a substrate for fermentation, then alternative energy production is achieved, but microorganism growth rate and metabolism rate are reduced due to low solubility
Solution Approach 1:
Methanol is introduced as an intermediary substance that enhances the solubility and bioavailability of gaseous substrates (CO, H2, CO2) in the aqueous phase. The methanol acts as a cosolvent and metabolic intermediate, facilitating the transfer of gaseous substrates to microbial cells while serving as an additional carbon source, thereby resolving the contradiction between substrate consumption and microbial growth rate
Solution Approach 2:
The invention changes the chemical composition parameters of the fermentation medium by adding methanol, which alters the solubility characteristics and mass transfer kinetics of gaseous substrates. This parameter change enables higher concentrations of dissolved gases to be maintained, simultaneously improving both substrate consumption rate and microbial metabolism rate
2Productivity
If traditional fermentation technology is used with dissolved organic substances, then high microorganism growth rate is achieved, but CO2 emission occurs and substrate versatility is limited
Solution Approach 1:
The invention converts CO2, traditionally a harmful emission product, into a valuable substrate that microbes can consume to produce hydrocarbon products. By introducing methanol and acetogen strains capable of utilizing CO2 via the Wood-Ljungdahl pathway, the process transforms CO2 from a waste product into a resource, eliminating emissions while maintaining productivity
Solution Approach 2:
The fermentation system achieves multi-functionality by enabling microbes to simultaneously consume multiple gaseous substrates (CO, H2, CO2) and produce valuable hydrocarbon products. This universal substrate utilization capability replaces traditional single-substrate fermentation while eliminating CO2 emissions through its consumption and conversion
3Device complexity
If syngas fermentation is performed without methanol addition, then process simplicity is maintained, but substrate consumption rate and production efficiency remain low
Solution Approach 1:
Methanol serves multiple functions simultaneously: it acts as a cosolvent to improve gas solubility, as an additional carbon source for microbial growth, as a metabolic intermediate in the Wood-Ljungdahl pathway, and as a agent to stimulate microbial activity. This multi-functionality justifies the added complexity by delivering substantial improvements in production efficiency across multiple parameters
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 method enhances the consumption rate of gaseous substrates and completely converts CO2 into value-added hydrocarbon products, thereby increasing metabolic efficiency and reducing greenhouse gas emissions, achieving a CO2-free waste gas fermentation process.
Implementation Method 1
converting the gaseous substrates and the methanol into hydrocarbon products through fermentation of the microbial strains
Implementation Method 2
Acetogen fixes C1 gas such as carbon monoxide or carbon dioxide to acetyl-CoA through the Wood-Ljungdahl pathway
Data Source
AI summary
Proposed is a method for CO2-free waste gas fermentation using microbial strains, and the method is capable of maximizing a consumption rate of gaseous substrates by additionally injecting methanol during a fermentation process of the microbial strains, and converting CO2, a greenhouse gas, generated during the fermentation process into hydrocarbon products therethrough. The method may comprise: 1) injecting microbial strains into a bioreactor; and 2) injecting gaseous substrates and methanol into the bioreactor, and converting the gaseous substrates and the methanol into hydrocarbon products through fermentation of the microbial strains, wherein all CO2 present inside the bioreactor is consumed and converted into hydrocarbon products.