Integrated Bioreactor System for Total Carbon Utilization in Biofuel
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Solution Overview
Problem
Current biodiesel production from microbial sources faces challenges due to low oil yields, high costs, and inefficiencies in converting carbohydrates to lipids, with existing methods failing to achieve commercial scale viability.
Innovation Solution
The use of separate bioreactors for aerobic oil production and anaerobic CO2 fixation, employing oleaginous microbes and acetogenic bacteria to optimize oil yields and CO2 fixation, respectively, with genetic modifications and metabolic engineering to enhance specific metabolic rates and volumetric productivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional carbohydrate conversion methods are used for biofuel production, then the process is simpler to implement, but the carbon conversion efficiency is low with significant carbon loss as CO2
Solution Approach 1:
The bioprocess is divided into two separate bioreactors: an aerobic bioreactor for lipid accumulation and an anaerobic bioreactor for CO2 fixation. This segmentation allows each reactor to be optimized for its specific function, achieving high carbon conversion efficiency by capturing and reutilizing CO2 that would otherwise be lost, while maintaining operational simplicity through modular design
Solution Approach 2:
The patent combines two previously separate processes (aerobic lipid production and anaerobic CO2 fixation) into an integrated bioprocess system where the CO2 output from the aerobic reactor becomes the input for the anaerobic reactor, creating a closed-loop carbon utilization system that improves overall efficiency
2Productivity
If microbial oil production is used for biodiesel, then renewable feedstock is obtained, but the oil yields are low and production costs are high
Solution Approach 1:
The system implements feedback by capturing CO2 produced during aerobic lipid metabolism and feeding it back to acetogenic bacteria in the anaerobic bioreactor. This feedback loop converts waste CO2 into additional carbon substrates, increasing overall oil yield and reducing the amount of external feedstock required, thereby lowering production costs
Solution Approach 2:
Instead of discarding CO2 as waste product, the system recovers and reutilizes it in the anaerobic bioreactor where acetogenic bacteria convert CO2 into additional carbon substrates for lipid production, effectively turning a waste stream into a valuable resource that increases productivity
3Loss of energy
If separate bioreactors are used for aerobic oil production and anaerobic CO2 fixation, then carbon conversion efficiency increases, but the device complexity increases
Solution Approach 1:
The anaerobic bioreactor serves multiple functions: it fixes CO2 from the aerobic reactor, produces additional carbon substrates through acetogenic metabolism, and can potentially produce other valuable products. This multi-functionality justifies the added complexity by delivering multiple benefits from a single additional unit
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 biodiesel production efficiency, reducing land requirements and costs by utilizing CO2 fixation methods that operate closer to equilibrium, achieving higher yields and economic viability.
Implementation Method 1
aerobic oil production
Implementation Method 2
CO2 fixation methods that operate closer to equilibrium
Data Source
AI summary
Some aspects of this invention provide methods and bioreactors for converting a carbon source into a lipid. In some embodiments, lipid production is carried out in an aerobic fermentor and carbon dioxide generated during lipid production is converted into a carbon substrate by CO2 fixation in an anaerobic fermentor. In some embodiments, the carbon substrate generated by CO2 fixation is used as the carbon source for lipid production, thus achieving total carbon utilization in lipid production.