Multiple Bioreactor System Central Bleed Line Gas Fermentation
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Solution Overview
Problem
Current ethanol production from CO fermentation is inefficient due to co-production of acetate and CO2, leading to reduced ethanol yield and potential greenhouse gas emissions, with existing bioreactor systems being inflexible and time-consuming in start-up and operation.
Innovation Solution
A multiple bioreactor system connected by a central bleed line allows fluid communication between bioreactors, enabling faster start-up, flexible operation, and conversion of acetate to ethanol in secondary bioreactors, optimizing ethanol production and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single bioreactor systems are used for gas fermentation, then the system structure is simple, but the start-up time is long and operational flexibility is poor
Solution Approach 1:
The system is divided into multiple independent bioreactors (first bioreactor, second bioreactor, etc.) that can operate independently or in coordination. Each bioreactor can be started, stopped, or maintained separately, enabling flexible operational configurations and rapid start-up by activating individual reactors rather than requiring a complete system start-up.
2Productivity
If multiple bioreactors operate independently without interconnection, then each reactor can be optimized individually, but the overall productivity and resource utilization are reduced
Solution Approach 1:
Multiple bioreactors are connected through a central bleed line that enables fluid communication between all reactors. This allows fermentation broth to be distributed and shared across the system, enabling continuous operation where one reactor can feed another, thereby increasing overall productivity while maintaining individual reactor optimization.
Solution Approach 2:
The central bleed line serves multiple functions: it connects all bioreactors, enables broth transfer between reactors, provides a pathway for continuous operation, and allows flexible configuration changes. This multi-functional component increases productivity without proportionally increasing system complexity.
3Loss of time
If a single bioreactor is used for continuous operation, then the system is easy to operate, but the start-up time is extended and operational interruptions cannot be compensated
Solution Approach 1:
Multiple bioreactors can be prepared and inoculated in advance before full operation begins. The central bleed line enables pre-established fluid connections between all reactors, so that when operation starts, broth can immediately flow between pre-configured reactors, dramatically reducing start-up time compared to sequential single-reactor activation.
4Loss of substance
If CO fermentation is performed in a single bioreactor, then the process is simple, but acetate co-production reduces ethanol yield and creates waste disposal issues
Solution Approach 1:
The central bleed line acts as an intermediary that transfers fermentation broth from one bioreactor to another. This enables the system to redirect broth containing acetate intermediates to a second bioreactor where further fermentation can convert acetate to ethanol, thereby improving overall ethanol yield without requiring complex internal reactor modifications.
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 system enhances ethanol production efficiency, reduces greenhouse gas emissions, and increases operational flexibility by facilitating rapid inoculation and compensation for non-operational bioreactors, thereby improving the commercial viability of ethanol production.
Implementation Method 1
a central bleed line, the central bleed line allowing fluid communication between the connected bioreactors
Implementation Method 2
two or more primary bioreactors adapted for fermentation of a gaseous substrate by one or more microorganisms to produce a fermentation broth
Data Source
Figure 1~2
AI summary
A bioreactor system is provided for continuous fermentation of a gaseous substrate, said system comprising two or more primary bioreactors and one or more secondary bioreactors connected by a central bleed line. Further provided is a process for inoculating multiple bioreactors utilising a central bleed line, said process comprising passing fermentation broth from a first primary bioreactor to other primary bioreactors and/or secondary bioreactors via a central bleed line. Further provided is a process for maintaining stable fermentation of a gaseous substrate across multiple bioreactors, said process comprising providing fermentation broth from one or more operational primary bioreactors to one or more secondary bioreactors via a central bleed line.