Biomass Densification for Negative-Buoyancy Carbon Sequestration
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Solution Overview
Problem
The challenge of sinking unprocessed biomass with low bulk density into anoxic basins for carbon sequestration requires excessive energy and impractical anchoring due to its positive buoyancy, making large-scale carbon dioxide removal economically and physically infeasible.
Innovation Solution
A method involving drying biomass to below 37% moisture content, shredding it to less than 20 mm, and compressing it to densities greater than 1.03 g/cm3 using mechanical or hydraulic methods, combined with CO2-free drying and high-pressure densification techniques like pelletization, briquetting, or cubing, to achieve negative buoyancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unprocessed biomass is transported into anoxic basin, then carbon sequestration is achieved, but excessive energy is required and anchoring becomes impractical due to positive buoyancy
Solution Approach 1:
The biomass is pre-processed through drying, shredding, and densification before transport to the anoxic basin. This preliminary densification action transforms the biomass from a positively buoyant state to a negatively buoyant state, eliminating the need for excessive energy input during transport and removing the requirement for anchoring systems.
Solution Approach 2:
The physical parameters of the biomass are fundamentally changed through the processing method: moisture content is reduced to below 37%, particle size is reduced to less than 20 mm, and density is increased to greater than 1.03 g/cm³. These parameter changes transform the buoyancy characteristics of the biomass, enabling it to sink naturally without additional energy input or anchoring.
2Reliability
If unprocessed biomass is transported into anoxic basin, then carbon sequestration is achieved, but anchoring material requirements become hugely impractical
Solution Approach 1:
The biomass is pre-processed through drying, shredding, and densification before transport to the anoxic basin. This preliminary densification action transforms the biomass from a positively buoyant state to a negatively buoyant state, eliminating the need for excessive energy input during transport and removing the requirement for anchoring systems.
Solution Approach 2:
The naturally low density of biomass, which initially causes positive buoyancy and anchoring requirements, is transformed into a benefit through controlled densification. By densifying the biomass to a specific range (>1.03 g/cm³), the same material property that caused the problem becomes the solution, enabling natural sinking without complex anchoring systems.
3Weight of moving object
If biomass density is improved to enable sinking, then anchoring weights are reduced to zero, but processing complexity increases
Solution Approach 1:
The densification process is divided into distinct operational stages: drying to reduce moisture content below 37%, shredding to reduce particle size to less than 20 mm, and compressing to increase density to greater than 1.03 g/cm³. This segmentation of the processing into manageable steps reduces overall system complexity compared to a single-stage high-complexity densification system.
Solution Approach 2:
The physical parameters of the biomass are fundamentally changed through the processing method: moisture content is reduced to below 37%, particle size is reduced to less than 20 mm, and density is increased to greater than 1.03 g/cm³. These parameter changes transform the buoyancy characteristics of the biomass, enabling it to sink naturally without additional energy input or anchoring.
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
Enables efficient, cost-effective, and carbon-efficient sinking of biomass into anoxic basins without additional ballast, reducing energy consumption and emissions, thereby facilitating large-scale carbon sequestration.
Implementation Method 1
heating biomass to at least 120 degrees Celsius using the biomass drier
Implementation Method 2
compressing it to densities greater than 1.03 g/cm3 using mechanical or hydraulic methods
Data Source
AI summary
A method for anoxic biological carbon sequestration and the resulting product for sequestering carbon is disclosed. The method includes removing moisture content from the biomass to below 37-percent through a carbon-zero drying process, then rendering the dried biomass in a grinding process to particulate that is no greater than 20 mm in any direction, and finally a densification process that forcibly extrudes the dried biomass particulate through an opening at a pressure in excess of 500 psi and with an achieved surface heating beyond 50′C. to enable self-cohesion of the resulting product so that it stays intact as it sinks down through the water column to the anoxic basin.