Compact Microalgae Photobioreactors for Carbon Sequestration
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Solution Overview
Problem
Current methods for carbon sequestration and organic waste management are economically unviable and inefficient, leading to environmental degradation and greenhouse gas emissions, with existing microalgae-based solutions being uncommercialized and unscaled.
Innovation Solution
A compact, high-productivity system for growing microalgae under controlled conditions, integrating with coal-fired power plants and organic waste processing to create a circular economy, utilizing CO2, heat, and fertilizers to enhance growth and reduce waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microalgae are grown in traditional open pond systems, then large area is available for growth, but productivity is low and contamination occurs
Solution Approach 1:
The system divides the microalgae cultivation into separate controlled modules - photobioreactors for high-density growth and controlled environment chambers - each optimized for specific functions, replacing the single large open pond system
Solution Approach 2:
The invention transitions from two-dimensional surface growth in open ponds to three-dimensional vertical photobioreactor systems, dramatically increasing cultivation density and productivity per unit area
2Object-affected harmful factors
If anaerobic digestion is used to treat POME, then environmental credentials improve, but economic returns are not attractive and complete solution is not achieved
Solution Approach 1:
The system converts harmful POME waste into valuable microalgae biomass and products through controlled anaerobic digestion followed by microalgae cultivation, transforming an environmental liability into an economic asset
Solution Approach 2:
The integrated system performs multiple functions simultaneously: waste treatment, carbon sequestration, biomass production, and energy generation, creating multiple revenue streams from a single waste input
3Loss of substance
If pyrolysis is used to process organic waste, then waste destruction is achieved, but CO2 and heat are released to atmosphere and ash is waste
Solution Approach 1:
The system captures CO2 from pyrolysis emissions and redirects it to microalgae photobioreactors as a carbon source, converting a harmful greenhouse gas into a valuable nutrient for biomass production
Solution Approach 2:
The invention merges the pyrolysis process with microalgae cultivation by integrating CO2 capture from pyrolysis flue gas directly into the photobioreactor system, creating a synergistic closed-loop process
4Ease of operation
If land fill is used for organic waste, then waste disposal is simple, but methane is given off which is highly potent greenhouse gas
Solution Approach 1:
The system captures methane from organic waste decomposition and uses it as a fuel source for energy generation, converting a potent greenhouse gas into a valuable energy resource that offsets operational costs
5Object-generated harmful factors
If carbon sequestration methods are implemented at scale, then CO2 emissions are reduced, but costs are unaffordable
Solution Approach 1:
The system makes the microalgae cultivation self-sufficient by using CO2 from industrial sources (pyrolysis, anaerobic digestion) as free carbon input, eliminating the need for expensive CO2 purchase and making carbon sequestration economically viable
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 system achieves near-zero waste and potentially carbon-negative operations by utilizing CO2 and heat from power plants and organic waste, producing valuable products and reducing greenhouse gas emissions.
Implementation Method 1
The key to this new process of carbon sequestration and creating a circular industry is a new manner of growing microalgae
Implementation Method 2
utilizing CO2, heat, and fertilizers to enhance growth and reduce waste
Data Source
AI summary
There are closed systems of growing microalgae but as they are not able to produce algal biomass economically they are very few and far between and are only used to grow microalgae for very expensive produce. These closed systems also require large space. The result of the lack of economic closed systems is why almost all algal biomass production currently uses raceway ponds. This invention integrates a new compact. very economic and highly productive closed system of growing microalgae including good parameter control with carbon sequestration from say a coal fired power plant or organic waste management in a way that makes the whole process financially attractive and cyclic and if desired it could be made carbon negative. The compact nature of this invention allows algal farms to be sited next to most sources of carbon dioxide.