Enhanced Rock Weathering Verification Using Trace Element Markers
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Solution Overview
Problem
Nature-based carbon dioxide removal (CDR) solutions face challenges such as high costs, slow price reduction with increased deployment, and potential fraud, while direct air capture (DAC) is costly and lacks scalability, necessitating a more efficient and verifiable method for carbon capture and storage.
Innovation Solution
Enhanced rock weathering (ERW) technology, which involves weathering silicate minerals in acidic soil solutions to capture CO2, is enhanced by methods to verify mineral transformation and carbon removal, and improve agronomic performance and dissolution rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nature-based carbon dioxide removal solutions are used, then cost is reduced ($5-20/tCO2e), but reliability and verification difficulty increase due to potential fraud and gaming the rules
Solution Approach 1:
The patent uses trace element markers (intermediaries) embedded in the rock material to verify carbon removal. These markers act as mediators that allow third-party verification without requiring direct measurement of carbon storage, thus maintaining reliability while keeping costs low through simple sampling and analysis protocols
Solution Approach 2:
The patent implements a feedback mechanism where trace element ratios in soil samples provide verifiable evidence of carbon removal. The measurement of these marker ratios feeds back into the verification system, allowing continuous monitoring and validation of carbon storage claims at scale
2Reliability
If direct air capture (DAC) is used, then reliability and quantification rigor are improved, but cost increases significantly (>500/tCO2e) and scalability is limited
Solution Approach 1:
The patent employs inexpensive rock materials (such as basalt or serpentine) as disposable carbon sinks. These rocks are applied to soil surfaces where they weather and capture CO2 over time. The low material cost and simple application method enable large-scale deployment at fractions of DAC costs while maintaining verifiable carbon removal through trace element markers
Solution Approach 2:
The patent changes the physical state and location of carbon capture from atmospheric direct capture (DAC) to soil-based mineral weathering. By transforming the capture mechanism to occur in situ through natural weathering processes enhanced by rock application, the system achieves lower costs and better scalability while maintaining quantification through chemical marker analysis
3Productivity
If rock material is applied to soil for enhanced weathering, then carbon removal capacity is increased, but soil acidity changes and agronomic performance may be affected
Solution Approach 1:
The patent applies rock materials with specific local compositions tailored to soil conditions. Different rock types (basalt, serpentine, limestone) are selected based on their chemical properties and matched to specific soil pH and composition requirements. This local optimization ensures both effective carbon removal through enhanced weathering and maintenance of agronomic performance
Solution Approach 2:
The patent creates composite soil amendments by combining rock materials with organic matter or other soil conditioners. These composites enhance both the carbon removal capacity through mineral weathering and the agronomic benefits through improved soil structure, water retention, and nutrient availability, thus addressing both objectives simultaneously
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
ERW provides permanent carbon storage with rigorous quantification, achieving cost-effective carbon capture and storage comparable to DAC, while ensuring transparency and reliability through verification methodologies.
Implementation Method 1
silicate minerals are weathered in acidic soil solution, thus driving the uptake of additional CO2 into dissolved inorganic carbon (DIC) in the soil solution
Implementation Method 2
silicate minerals are weathered by CO2 from the ambient air which has been dissolved into water, reacting to produce dissolved inorganic carbon
Implementation Method 3
CO2 from the ambient air which has been dissolved into water
Implementation Method 4
atmospheric CO2 has dissolved in it and formed carbonic acid (H2CO3)
Implementation Method 5
measure the production of free ions from the applied material and the transport of those ions outside of a control volume
Data Source
Figure 1~2
Figure 3A~3D
Figure 4
AI summary
The present disclosure relates to methods of verifying enhanced rock weathering using immobile trace elements found within a mineral amendment. Further disclosed are mineral amendments that enable enhanced rock weathering.