Microbial Electrolytic Carbon Capture for CO2 Conversion
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Solution Overview
Problem
Current carbon dioxide capture technologies are energy-intensive and costly, particularly for ambient CO2 capture, and lack safe storage options, limiting their effectiveness in addressing cumulative anthropogenic CO2 emissions.
Innovation Solution
A microbial electrolytic carbon capture (MECC) process that utilizes wastewater as both an electrolyte and energy source to capture CO2 by oxidizing organic substances, generating hydrogen gas, and transforming CO2 into stable metal carbonate or bicarbonate salts, with a low external energy input and avoidance of toxic chlorine production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CO2 separation and purification methods are used, then CO2 capture efficiency is improved, but energy consumption increases significantly
Solution Approach 1:
The patent combines CO2 capture with wastewater treatment in a single integrated system. The electrolytic cell processes both wastewater and CO2 simultaneously, merging two separate operations into one unified process that achieves both objectives without requiring additional energy input for separate treatment systems.
Solution Approach 2:
The electrolytic cell performs multiple functions: it treats wastewater by removing organic matter, captures CO2 from the gas phase, and produces hydrogen gas as a valuable byproduct. This multi-functional approach eliminates the need for separate CO2 capture and wastewater treatment systems, reducing overall energy consumption.
2Productivity
If solvent/sorbent regeneration process is used for CO2 capture, then CO2 separation capability is improved, but energy penalty increases by 10-40%
Solution Approach 1:
The patent extracts CO2 from the gas phase directly into the electrolyte solution within the electrolytic cell, bypassing the need for solvent/sorbent regeneration processes. CO2 is captured through direct absorption and chemical reaction in the electrolyte, eliminating the energy-intensive regeneration step required by conventional methods.
Solution Approach 2:
The patent replaces the mechanical/thermal regeneration process with an electrochemical approach. Instead of heating and regenerating solvents or sorbents, the system uses electrochemical reactions in the electrolytic cell to capture and convert CO2, significantly reducing energy penalties.
3Quantity of substance
If base solvent absorption or solid sorbent adsorption is used for ambient CO2 capture, then CO2 capture capacity is improved, but system complexity and cost increase
Solution Approach 1:
The electrolytic cell serves as a universal device that simultaneously captures CO2 from ambient air, treats wastewater, and produces hydrogen. This single device replaces multiple separate systems (CO2 capture system, wastewater treatment system, and hydrogen production system), reducing overall system complexity.
Solution Approach 2:
The system uses the wastewater itself as the electrolyte medium for CO2 capture, eliminating the need for separate CO2 capture solvents or sorbents. The wastewater provides both the electrolyte function and the CO2 absorption medium, making the system self-sufficient and simpler in design.
4Productivity
If electrolysis of saline water is used for CO2 capture, then CO2 absorption capability is improved, but toxic Cl2 and halogenated compounds are generated
Solution Approach 1:
The patent changes the electrolyte composition from saline water (containing chloride ions) to wastewater with suitable buffering capacity. This parameter change in the electrolyte composition prevents the formation of toxic chlorine and halogenated compounds while maintaining effective CO2 absorption capability through appropriate pH control and buffering.
Solution Approach 2:
The patent converts the potentially harmful chloride ions in saline water into a beneficial buffering system using wastewater. The wastewater's natural buffering capacity neutralizes the harmful effects of chloride ions, transforming a harmful chemical environment into a safe and effective CO2 capture medium.
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 MECC process achieves efficient carbon capture and storage, reducing energy consumption and environmental risks, while transforming wastewater into a carbon-negative and energy-positive system capable of capturing both point-source and ambient CO2, with potential for large-scale implementation in wastewater treatment plants.
Implementation Method 1
oxidizing organic substances in the anolyte
Implementation Method 2
reducing CO2 to carbonate or bicarbonate salts in the catholyte
Implementation Method 3
generating hydrogen gas
Data Source
AI summary
The present invention relates to the unexpected discovery of systems for capturing carbon dioxide and producing hydrogen gas. In certain embodiments, the system treats wastewater. In certain embodiments, the system captures and sequesters CO2 as carbonate salts.