Bubble Reactor CO2 Extraction From Seawater With Low Energy Use
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Solution Overview
Problem
Existing methods for extracting carbon dioxide from seawater are inefficient, energy-intensive, and require significant maintenance, while also competing for valuable land resources and not effectively addressing ocean acidification.
Innovation Solution
A direct ocean capture (DOC) system using bubble reactors that minimize the use of packing materials, utilize carrier gases to form bubbles in seawater, and operate in various modes (air sparging, vacuum, and combo modes) to achieve high CO2 extraction efficiency and purity, with control systems for optimizing fluid flow and pH adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional CO2 extraction methods are used, then CO2 can be extracted from seawater, but the process is energy-intensive and inefficient
Solution Approach 1:
The system changes the pH parameter of seawater by adding acid to convert dissolved CO2 into free CO2 gas, which then can be efficiently extracted. This parameter transformation enables low-energy extraction by exploiting the natural tendency of CO2 to escape from acidified seawater, avoiding energy-intensive thermal or high-pressure methods
Solution Approach 2:
The invention replaces mechanical/thermal extraction systems with a chemical-biological approach using acidification and natural gas exchange. Instead of using high-energy mechanical separation or thermal distillation, the system uses chemical transformation (acidification) combined with natural diffusion and aeration to achieve efficient CO2 extraction with minimal energy input
2Productivity
If traditional extraction systems are used, then CO2 extraction can be performed, but they require significant maintenance
Solution Approach 1:
The system uses naturally occurring seawater and simple acid addition to drive the extraction process, eliminating the need for complex mechanical components that require maintenance. The bubble columns and pH control systems are inherently simple structures that self-regulate or require minimal intervention, reducing maintenance needs while maintaining high extraction efficiency
Solution Approach 2:
The invention extracts only the essential functional components needed for CO2 removal (acid dosing system, bubble columns, gas collection), eliminating complex mechanical separation equipment, pumps, and valves that would require maintenance. This simplified extraction approach maintains productivity while dramatically reducing maintenance requirements
3Object-generated harmful factors
If traditional CO2 extraction methods are used, then CO2 can be removed from seawater, but they do not effectively address ocean acidification
Solution Approach 1:
The system converts the harmful effect of added acid (which causes local acidification) into a beneficial process by using controlled acidification to liberate CO2 from seawater, which is then captured and removed. The localized acidification is precisely controlled and limited to the treatment zone, while the overall system addresses ocean acidification by removing CO2 from seawater that would otherwise be absorbed from the atmosphere
Solution Approach 2:
The system carefully controls pH parameters to achieve CO2 liberation without causing harmful acidification. By maintaining pH changes within specific ranges and using controlled acid dosing, the system transforms seawater chemistry to extract CO2 efficiently while the removed CO2 prevents broader ocean acidification, turning a potential harmful parameter change into a beneficial outcome
4Productivity
If more land is allocated for CO2 extraction facilities, then extraction capacity can be increased, but valuable land resources are consumed
Solution Approach 1:
The system uses thin-film or compact bubble column reactors that achieve high extraction capacity in minimal space. The vertical bubble columns provide large surface area to volume ratios, enabling efficient gas-liquid contact in a compact footprint, thus increasing extraction capacity without proportionally increasing land usage
Solution Approach 2:
The invention transitions from horizontal expansion to vertical utilization by employing tall, narrow bubble columns and stacked reactor configurations. This dimensional shift allows the system to increase extraction capacity by utilizing vertical space rather than consuming additional horizontal land area, effectively addressing the land resource constraint
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 achieves high CO2 extraction efficiency (>80%) with low energy consumption, reduced maintenance, and tunable purity, addressing ocean acidification by providing valuable CO2 streams for offshore use and reducing competition for land.
Implementation Method 1
A carrier gas is bubbled through the acidified seawater in the interior volume of the vessel, thereby causing the carrier gas to extract at least 80% of the CO2 from the acidified seawater
Implementation Method 2
the vessel receives the carrier gas from the bottom of the vessel and the acidified seawater from the top of the vessel
Data Source
AI summary
In a general aspect, carbon dioxide (CO2) is extracted from seawater. In some aspects, a direct ocean capture (DOC) method includes receiving, in an interior volume of a vessel, acidified seawater that includes dissolved carbon dioxide. A carrier gas is bubbled through the acidified seawater in the interior volume of the vessel, thereby causing the carrier gas to extract a portion (e.g., at least 80%) of the carbon dioxide from the acidified seawater. A product gas that includes the extracted carbon dioxide is communicated from the interior of the vessel. The product gas may include, for example, at least 4% carbon dioxide.