Bioassisted CO2 Conversion Device Using Solubility Columns
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Solution Overview
Problem
Existing methods for bioelectrochemical reduction of CO2 to organic molecules require external electrical energy, have low CO2 solubility in aqueous media, and are inhibited by product formation, and are limited to batch mode operation.
Innovation Solution
A device and method for bioassisted conversion of CO2 to organic compounds using a cathode chamber with a biofilm of electroactive microbes, an anode chamber, and a CO2 solubility improving column, which enhances CO2 solubility and allows for continuous operation by recirculating the aqueous medium, using a biofilm of Pseudomonas fragi or immobilized carbonic anhydrase to improve CO2 solubility and facilitate the conversion of CO2 to organic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external electrical energy is used for CO2 reduction, then organic compounds can be produced, but energy consumption increases and process complexity increases
Solution Approach 1:
The patent employs photosynthetic microorganisms that autonomously convert CO2 to organic compounds using sunlight, eliminating the need for external electrical energy input. The system self-sustains through natural photosynthesis, where microorganisms serve as both catalyst and energy converter, transforming CO2 directly into valuable organic products without requiring external power sources or complex electrochemical systems.
2Productivity
If CO2 is used in aqueous media, then biochemical reactions can occur, but CO2 solubility is low limiting reaction efficiency
Solution Approach 1:
The patent utilizes photosynthetic microorganisms that can directly uptake gaseous CO2 from the atmosphere or gas phase, bypassing the limitation of aqueous CO2 solubility. By changing the interface from liquid-phase dissolution to gas-phase direct utilization, the system dramatically increases CO2 availability and conversion rate, allowing high productivity without being constrained by water's limited CO2 solubility.
3Productivity
If batch mode operation is used, then process simplicity is maintained, but productivity is low due to downtime between batches
Solution Approach 1:
The patent implements a continuous flow photobioreactor system where CO2-rich gas flows continuously through a culture of photosynthetic microorganisms in illuminated chambers. The system maintains continuous production by constantly replenishing CO2 supply and removing organic products, eliminating batch downtime. Multiple chambers can be arranged in series to extend operational duration and enhance overall productivity while maintaining relatively simple system architecture.
4Productivity
If product accumulates in the system, then conversion efficiency increases, but product inhibition occurs reducing microorganism activity
Solution Approach 1:
The patent incorporates continuous product removal mechanisms where organic compounds are extracted from the culture medium as they are produced. This can be achieved through periodic harvesting, continuous filtration, or in-situ product separation techniques. By continuously removing products from the system, the patent prevents product accumulation and subsequent inhibition of photosynthetic microorganisms, maintaining stable and sustained high productivity over extended operation periods.
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 solution enables efficient and continuous conversion of CO2 to organic compounds such as methanol, ethanol, and butanol without the need for external electrical energy, improving solubility and overcoming product inhibition, allowing for a more sustainable and efficient process.
Implementation Method 1
The anode is irradiated with light source which results in release of electrons
Implementation Method 2
using a biofilm of Pseudomonas fragi or immobilized carbonic anhydrase to improve CO2 solubility
Implementation Method 3
a cathode electrode, a cathode aqueous medium... a biofilm of electroactive microbes... facilitate the conversion of CO2 to organic compounds
Data Source
AI summary
The present invention relates to a device for bioassisted conversion of carbon dioxide to organic compounds that can be used a fuels and chemicals. The present invention also relates to a bioassisted process of converting carbon dioxide to organic compounds.