Integrated DAC and Bioelectrochemical CO2 Conversion System
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Solution Overview
Problem
Direct air capture (DAC) of CO2 faces challenges due to low feed CO2 concentration in ambient air, requiring specialized sorption materials with high energy penalties, and traditional bioprocesses for converting CO2 are resource-intensive and have significant carbon footprints.
Innovation Solution
An integrated modular system combining direct air capture using functionalized metal-organic frameworks or covalent organic frameworks with electro-microbial conversion, where autotrophic microorganisms convert captured CO2 into value-added products, such as acetate, which is then used by heterotrophic microbes to produce fuels, biopolymers, and chemicals, optimizing energy use and reducing land occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized sorption materials are used to capture CO2 from ambient air, then CO2 capture effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent combines direct air capture with electro-microbial conversion into an integrated system where the CO2 capture unit is directly coupled with microbial electrosynthesis reactors. This merging eliminates the need for separate CO2 compression, purification, and transportation steps, thereby reducing overall energy consumption while maintaining capture effectiveness.
Solution Approach 2:
The patent converts the low-concentration CO2 stream (typically considered a disadvantage for capture efficiency) directly into a feedstock for microbial conversion. By using electro-microbial processes, the system transforms the challenge of low CO2 concentration into an opportunity for direct conversion to value-added products, bypassing energy-intensive concentration steps.
2Productivity
If traditional bioprocesses are used to convert CO2, then product generation is achieved, but land occupation and carbon footprint increase
Solution Approach 1:
The patent replaces traditional land-based agricultural bioprocesses with an electro-microbial system that uses electricity (potentially from renewable sources) to drive CO2 conversion. This substitution eliminates the need for large land areas required for growing feedstock crops, thereby reducing land occupation while maintaining product generation capability.
Solution Approach 2:
The patent changes the fundamental parameters of the conversion process by using electro-microbial technology instead of traditional biological cultivation. This enables CO2 conversion to occur in controlled bioreactors with high space-time yields, dramatically reducing the land area required per unit of product while lowering the overall carbon footprint of the process.
3Quantity of substance
If CO2 is captured and stored as gas, then sequestration capacity is achieved, but storage and transportation costs increase
Solution Approach 1:
The patent uses microbial electrosynthesis to convert gaseous CO2 directly into liquid or solid value-added products (such as organic compounds, biomass, or materials). This phase transition from gas to condensed phase eliminates the need for expensive high-pressure storage and specialized transportation infrastructure, while maintaining sequestration capacity in the form of stable end products.
Solution Approach 2:
Instead of treating CO2 as a waste product requiring storage and transportation, the patent converts it into valuable chemicals and materials through electro-microbial processes. This transformation turns the CO2 stream from a liability (requiring costly management) into an asset (producing marketable products), thereby eliminating storage and transportation costs while achieving sequestration.
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 system achieves lower carbon footprints and economic viability by converting CO2 into high-value products, offering a scalable and sustainable method for carbon sequestration and value-added product generation, particularly when powered by renewable energy.
Implementation Method 1
small-molecular functionalized metal-organic frameworks (MOFs) and/or covalent organic frameworks (COFs) that exhibit CO2 capturing capacity from humid ambient air
Implementation Method 2
autotrophic microorganisms do not require a fixed source of organic carbon and predominantly obtain carbon through intracellular CO2 fixation
Implementation Method 3
electro-microbial conversion, where autotrophic microorganisms convert captured CO2 into value-added products
Implementation Method 4
heterotrophic microbes (e.g. Escherichia coli) generate higher-value carbon molecules such as biopolymers, biofuels and fine chemicals
Data Source
AI summary
An integrated, modular system for direct air capture (DAC) and electro-microbial production (EMP) for bioelectrochemical conversion of CO2 comprises (a) a solid absorbent configured to directly capture CO2 from air; (b) a first bioreactor configured to receive enriched and purified CO2 from the absorbent and convert the CO2 to an upgradeable organic carbon intermediate by an autotrophic microorganism, wherein the autotrophic organism derives energy from oxidation of electrochemically-generated reducing equivalents; and (c) a second bioreactor configured to receive the organic carbon intermediate from the first bioreactor for use as a feedstock by a metabolically engineered microorganism to generate a value added product.