Methanotrophic Bioreactor for PHA Production from Methane Emissions
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Solution Overview
Problem
Existing methods for treating methane emissions are not economically or technologically feasible in most practical contexts, especially under sub-optimal methane-in-air conditions, and do not generate commercially useful products.
Innovation Solution
A system using methanotrophic microorganisms to process methane emissions from various sources, including landfills and coal mines, within a bioreactor, where the microorganisms convert methane into commercially useful products such as polymers and plastics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional methods (turbines, engines, fuel cells) are used to convert methane emissions into heat and electricity, then energy recovery is achieved, but the systems are not economically or technologically feasible under sub-optimal methane-in-air conditions and do not generate commercially useful products
Solution Approach 1:
The patent changes the operational parameters by using methanotrophic microorganisms that can effectively consume methane across a wide range of methane concentrations (5-50% v/v), unlike conventional technologies that require high purity methane. This biological approach transforms the system into one that thrives under sub-optimal conditions, achieving both energy recovery and commercial product generation simultaneously
Solution Approach 2:
The patent converts harmful methane emissions into valuable commercial products (polyhydroxyalkanoates for plastics, single-cell protein for animal feed, biofuels). Instead of merely burning methane for energy, the system transforms the greenhouse gas into economically useful materials, turning an environmental liability into a profit center
2Reliability
If methanotrophic microorganisms are used to consume methane, then methane treatment effectiveness is improved, but the system must maintain consistent product quality under variable methane emission conditions
Solution Approach 1:
The system incorporates monitoring and control mechanisms to maintain optimal growth conditions for methanotrophic microorganisms. By continuously adjusting parameters such as oxygen supply, nutrient delivery, and pH control, the system ensures consistent PHA production despite variations in methane concentration and composition in the input gas stream
Solution Approach 2:
The patent optimizes specific growth conditions including temperature (20-40°C), pH (6.5-7.5), and oxygen availability to maximize both methane consumption efficiency and PHA production. These controlled parameter changes ensure that the microorganisms maintain high productivity and product quality regardless of feedstock variability
3Productivity
If multiple essential nutrients are controlled to induce pMMO and PHA production in production cycles, then product yield and consistency are improved, but the process complexity increases
Solution Approach 1:
The system employs periodic batch cycles where nutrient compositions are systematically varied over time. During growth phases, nutrients are provided to support biomass accumulation; during production phases, specific nutrient limitations (such as nitrogen or phosphorus) are imposed to trigger PHA accumulation. This temporal separation simplifies control compared to simultaneous optimization of all parameters
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 effectively reduces methane emissions while producing harvestable, high-value products with consistent functional properties, making the process commercially viable and sustainable.
Implementation Method 1
A system using methanotrophic microorganisms to process methane emissions from various sources, including landfills and coal mines, within a bioreactor, where the microorganisms convert methane into commercially useful products such as polymers and plastics
Data Source
AI summary
Several embodiments of the invention relate generally to a system and methods for the treatment of gaseous emissions comprising methane and one or more non-methane compounds that can influence the metabolism of methane-oxidizing microorganisms. In several embodiments, there is provided a system and methods for the treatment of methane emissions through the use of methanotrophic microorganisms to generate functionally consistent and harvestable products. Certain embodiments of the invention are particularly advantageous because they reduce environmentally-destructive methane emissions and produce harvestable end-products.