Microbial Carbonate Precipitation Using ChaA Bacteria for CO2 Sequestration
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Solution Overview
Problem
Current CO2 sequestration methods, such as microbial induced carbonate precipitation using ureolysis, face challenges like malodor issues, limited distribution of ureolytic species, and viability under extreme conditions, while other methods like burial require high-quality CO2 and high temperatures/pressures, making them inefficient for large-scale CO2 storage.
Innovation Solution
A method involving a liquid calcification medium with yeast extract, specific carbon sources like calcium carboxylic acids, and bacteria expressing the chaA gene to induce microbial carbonate precipitation, allowing CO2 sequestration through microbial induced carbonate precipitation (MICP) without relying on urea, thereby overcoming previous limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ureolysis is used for microbial induced carbonate precipitation, then CO2 sequestration can be achieved, but malodor issues and limited distribution of ureolytic species occur
Solution Approach 1:
The invention changes the chemical parameters of the system by replacing urea with alternative carbon sources (acetate, propionate, butyrate) and nitrogen sources (ammonium salts, nitrate, nitrite). This parameter change eliminates the malodor associated with urea decomposition while maintaining the ability to drive carbonate precipitation through pH elevation via ammonia production from the alternative nitrogen sources.
Solution Approach 2:
The invention uses readily available, inexpensive materials such as table salt (NaCl) as a nitrogen source and common organic acids (acetate, propionate, butyrate) as carbon sources. These replace the need for specialized ureolytic bacteria and urea, making the system more accessible and eliminating odor problems while achieving the same CO2 sequestration goal.
2Ease of manufacture
If burial method is used for CO2 sequestration, then simplicity and cost are improved, but CO2 escape risk and inefficient CO2 conversion occur
Solution Approach 1:
The invention replaces the mechanical burial approach with a bio-chemical system where microorganisms actively convert CO2 into solid carbonate minerals through metabolic processes. This substitution transforms CO2 from a gas that could escape into stable solid carbonates, eliminating the leakage risk while maintaining simplicity and low cost through the use of natural biological processes.
Solution Approach 2:
The invention utilizes phase transition by converting gaseous CO2 into solid calcium carbonate minerals through microbially induced carbonate precipitation. This phase change from gas to solid ensures permanent sequestration without the risk of escape that plagues burial methods, while the process remains simple and cost-effective.
3Ease of operation
If burial method is used for CO2 sequestration, then simplicity is improved, but inefficient CO2 conversion to stable carbonates occurs
Solution Approach 1:
The invention employs self-service by utilizing the natural metabolic capabilities of microorganisms to convert CO2 into stable carbonates. The system requires minimal external intervention beyond providing the appropriate chemical environment (pH, nutrients), allowing the biological system to perform the conversion automatically. This maintains simplicity while dramatically improving conversion efficiency compared to passive burial methods.
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 method effectively sequesters CO2 by forming precipitated calcium carbonates, which can be recovered and used industrially, offering a scalable and environmentally friendly alternative with net-negative CO2 release, addressing the inefficiencies of existing methods.
Implementation Method 1
allowing microbial induced carbonate precipitation of calcium carbonate, thereby sequestering at least some of the CO2 introduced in said step of introducing
Implementation Method 2
creation of precipitated calcium carbonates through a microbially induced carbonate precipitation
Data Source
AI summary
A method for sequestering CO2 and creating precipitated calcium carbonates includes: (a) providing a liquid calcification medium including: a nutrient broth including water and a yeast extract, a carbon source selected from calcium carboxylic acids and calcium dicarboxylic acids and mixtures thereof, and bacteria that naturally express the chaA gene; (b) introducing CO2 to the liquid calcification medium; and (c) allowing microbial induced carbonate precipitation of calcium carbonate, thereby sequestering at least some of the CO2 introduced in the step of introducing.