Microbial Carbonate Precipitation for CO2 Sequestration and Heavy Metal Fixing
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Solution Overview
Problem
Current methods for CO2 sequestration and heavy metal removal from flue gas streams are inefficient, requiring high-purity CO2, high temperatures, and pressures, or have limitations such as potential CO2 escape and inefficient conversion, while also failing to effectively immobilize toxic heavy metals and other contaminants.
Innovation Solution
A method involving microbial/algal induced carbonate precipitation using a symbiotic blend of bacteria and algae in a liquid medium with CO2, sunlight, and specific nutrients to create precipitated Calcite, Dolomite, or Struvite, which sequesters CO2 and heavy metals, utilizing phenotypically mutated bacteria and algae to enhance efficiency and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure and high purity CO2 gases are used to generate stable mineral carbonates, then CO2 sequestration efficiency is improved, but equipment complexity and operating cost increase
Solution Approach 1:
The patent replaces mechanical/chemical methods (high pressure, high temperature, acid treatment) with biological methods (microbial-induced carbonate precipitation). The microbial process occurs at ambient conditions without requiring complex equipment for pressure control or high-temperature heating, thereby substituting a complex mechanical system with a simpler biological system that achieves the same CO2 sequestration goal.
Solution Approach 2:
The patent changes the operating parameters from extreme conditions (high pressure, high temperature, 99% pure CO2) to ambient conditions (atmospheric pressure, ambient temperature, lower CO2 purity requirements). This parameter change is enabled by the biological catalyst (microbes) which can function effectively under milder conditions while still achieving efficient CO2 sequestration through biomineralization processes.
2Productivity
If high temperature and high pressure are applied to produce carbonates, then CO2 conversion to stable minerals is improved, but energy consumption increases
Solution Approach 1:
The patent substitutes thermal energy input (high temperature heating) with biological energy conversion (microbial metabolism). The microbes convert chemical energy from organic substrates into the energy needed for carbonate precipitation, eliminating the need for external high-temperature heating systems and associated energy consumption while maintaining efficient CO2 conversion to stable minerals.
Solution Approach 2:
The microbial system is self-sustaining, using organic carbon sources to fuel their metabolic processes that drive carbonate precipitation. The system serves itself by using the available organic matter in the substrate to generate the energy and chemical conditions necessary for CO2 sequestration, without requiring external energy input for heating or pressurization.
3Productivity
If conventional methods are used for heavy metal removal, then heavy metals can be removed, but they cannot be effectively immobilized and sequestered long-term
Solution Approach 1:
The patent merges two separate functions (CO2 sequestration and heavy metal removal/immobilization) into a single integrated process. The microbial-induced carbonate precipitation simultaneously sequesters CO2 as calcium carbonate minerals and immobilizes heavy metals either by co-precipitation, adsorption onto the forming carbonate surfaces, or incorporation into the mineral structure, achieving both goals through one unified biological process.
Solution Approach 2:
The patent creates composite materials where heavy metals are incorporated into or associated with the biologically-formed carbonate mineral structures. This results in a composite material system where the carbonate matrix provides stable long-term containment for the heavy metals, transforming them from free-floating contaminants into structurally-bound components of the sequestered mineral phase.
4Ease of manufacture
If direct burial is used for CO2 sequestration, then simplicity and cost are improved, but CO2 escape risk and conversion efficiency worsen
Solution Approach 1:
The patent introduces microbes as an intermediary agent between CO2 and the final carbonate mineral product. Rather than direct burial of gaseous or liquid CO2, the microbes act as catalysts that facilitate the conversion of CO2 into stable solid carbonate minerals through biological metabolism. This intermediary biological process ensures complete conversion and stable immobilization while maintaining relative simplicity of the overall system.
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 achieves a five to ten-fold increase in CO2 sequestration efficiency, effectively immobilizing CO2 and heavy metals, and can utilize contaminated water and flue gas streams, providing a scalable and cost-effective solution for carbon capture and heavy metal fixation.
Implementation Method 1
Microbial/algal induced mineralization of Calcium Carbonate (CaCO3) is one of the most studied mechanisms of biomineralization. The production of CaCO3 minerals can allow for long-term storage of CO2... Historically studied metabolic activities that have been shown to drive microbial/algal CaCO3 production include photosynthesis
Implementation Method 2
allowing microbial/algal induced carbonate precipitation of calcium carbonate, dolomite, vaterite and struvite, thereby sequestering most of the CO2, and nearly all the heavy metals introduced
Implementation Method 3
Microbial/algal metabolic activity can promote biomineralization. Microbial/algal induced mineralization of Calcium Carbonate (CaCO3) is one of the most studied mechanisms of biomineralization
Implementation Method 4
providing a liquid medium including: water, a carbon dioxide source (air injection or flue-stream injection), heavy metals and other contaminants and a symbiotic blend of bacteria/algae
Data Source
AI summary
A method for sequestering CO2 by creating precipitated calcium carbonates including Calcite, Dolomite, Vaterite and Struvite; (1) Utilizing a mutually beneficial bacterial/algal colony that can fix CO2 as Calcite, Dolomite, Vaterite and Struvite (2) providing sunlight, water, CO2 from either the air or industrial waste streams; and (3) assisting microbial/algal induced carbonate precipitation of Calcite, Dolomite, Vaterite and Struvite, thereby sequestering most of the CO2 introduced in step (2). In addition, chlorine, sulfur, H2S, NOx and toxic heavy metals will be fixed into the Calcite, Dolomite, Vaterite and/or Struvite matrix, rendering them environmentally harmless.