U-loop Fermenter Dynamic Substrate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fermentation processes in U-loop fermenters, such as those using methanotrophic bacteria like Methylococcus capsulatus, face significant challenges in substrate feed control during the start-up phase, leading to reduced biomass production and productivity due to underfeeding or overfeeding, resulting in inefficient fermentation product yield.
Innovation Solution
A dynamic system and method that utilizes a computer-connected U-loop fermenter with a processor and database for repetitive analysis and adjustment of parameters, performing mathematical analyses to optimize substrate feed rates, allowing for real-time adjustments based on calculated test and control values to enhance fermentation productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substrate feed is increased to improve biomass production, then productivity is improved, but the risk of over-feeding increases causing yield drop to zero and process failure
Solution Approach 1:
The patent implements a feedback control system where process parameters (substrate consumption rate, biomass concentration, dissolved oxygen) are continuously monitored and fed back to adjust the substrate feed rate. This dynamic feedback mechanism allows the system to respond to changing fermentation conditions, increasing productivity when conditions are favorable while preventing over-feeding that would cause process failure, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent transitions from static, pre-defined feed rates to dynamic, real-time adjustment of substrate feed based on actual process conditions. The feed rate is continuously adapted during fermentation based on measured parameters, allowing the system to optimize productivity while maintaining stability by responding dynamically to changing metabolic states of the microorganisms.
2Reliability
If substrate feed is decreased to avoid over-feeding and process failure, then process reliability is improved, but productivity is reduced by 20-40%
Solution Approach 1:
The feedback control system continuously monitors substrate consumption and biomass production rates, adjusting the feed rate to match actual microbial demand. This prevents both over-feeding (which would cause failure) and under-feeding (which would reduce productivity), allowing the system to operate at optimal productivity levels while maintaining high reliability through real-time adaptive control.
Solution Approach 2:
The fermentation process essentially regulates its own feed requirements through the control system that responds to microbial metabolic signals (substrate consumption rate, biomass growth rate). The system serves itself by using the microorganisms' own metabolic activity as the control signal, eliminating the need for conservative under-feeding while preventing over-feeding.
3Reliability
If traditional fermentation control is used to ensure proper start-up, then process reliability is maintained, but substrate is under-fed resulting in low productivity
Solution Approach 1:
The control system is pre-programmed with optimal feed profiles and control algorithms that guide the fermentation through successful start-up and into high-productivity phases. By having preliminary control strategies prepared based on expected process dynamics, the system ensures reliable start-up while immediately transitioning to optimized feed rates that maximize productivity, rather than maintaining conservative under-feeding throughout.
Solution Approach 2:
The patent implements dynamic changes in feed rate parameters based on fermentation phase and measured process conditions. During start-up, parameters are adjusted to ensure successful establishment of the culture, then progressively changed to higher feed rates as biomass concentration and metabolic activity increase, allowing both reliable start-up and high subsequent productivity.
Data Source
AI summary
A system and a method is disclosed for adjusting and/or optimizing a fermentation process performed in one U-loop fermenter, the system including a processor and database for repetitively providing a test value of a fermenter parameter and for repetitively entering the test value of the parameter in the database; wherein the database stores multiple test value entries at various points in time and also stores multiple control value entries at various points in time, wherein the processor performs a mathematical analysis of the test value for providing a calculated test value, and/or the control value for providing at least one calculated control value; and selects, on the basis of the calculated test value and/or on the calculated control value, an adjustment to be introduced into at least one other U-loop fermenter to benefit from the change made in the one U-loop fermenter.