Membrane Photobioreactor Gas Control for Biomass
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Solution Overview
Problem
Photobioreactors face challenges in maintaining optimal CO2 and O2 concentrations within the liquid media, leading to inefficient biomass production and carbon capture, as existing methods for gas control are energy-intensive and inefficient, and high O2 levels can be toxic to photosynthetic organisms.
Innovation Solution
A membrane photobioreactor system enclosed within a gas-impermeable chamber allows for controlled gas exchange, using a permeable membrane to regulate CO2 and O2 levels, with a control system managing the atmosphere to optimize gas concentrations and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas control methods are used in photobioreactors, then CO2 and O2 concentrations can be maintained, but energy consumption increases and efficiency decreases
Solution Approach 1:
The photobioreactor system utilizes the photosynthetic activity of microalgae to automatically regulate gas concentrations. Microalgae consume CO2 and produce O2 through photosynthesis, creating a self-regulating system that maintains optimal gas levels without external intervention or energy input for gas control
Solution Approach 2:
A gas-permeable membrane serves as an intermediary between the internal culture medium and external atmosphere, facilitating passive gas exchange. The membrane allows CO2 to diffuse into the culture while preventing excessive O2 accumulation, eliminating the need for active gas control mechanisms
2Productivity
If high O2 levels are allowed in the liquid media, then oxygen production increases, but photosynthetic organisms are harmed due to O2 toxicity
Solution Approach 1:
Excess oxygen is continuously removed from the liquid media through the gas-permeable membrane, which allows O2 to diffuse from the high-concentration culture medium to the lower-concentration external atmosphere. This extraction prevents O2 toxicity while maintaining high productivity
Solution Approach 2:
The system dynamically adjusts O2 concentration parameters by utilizing the concentration gradient across the gas-permeable membrane. As O2 accumulates in the culture medium, the gradient increases, accelerating passive diffusion and automatically maintaining O2 levels within the non-toxic range
3Productivity
If CO2 concentration is increased to enhance biomass production, then growth rate improves, but control complexity and energy requirements increase
Solution Approach 1:
Microalgae naturally regulate CO2 consumption through their photosynthetic metabolism, creating a self-adjusting system. As biomass increases, CO2 consumption increases proportionally, automatically maintaining optimal CO2 levels without external control mechanisms
Solution Approach 2:
The gas-permeable membrane acts as an intermediary that facilitates passive CO2 transfer from the external atmosphere to the internal culture medium. This eliminates the need for complex CO2 injection systems while ensuring continuous supply for enhanced biomass production
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 approach enhances biomass production efficiency, improves carbon capture, and maintains optimal gas conditions, reducing energy costs and operational complexity while preventing O2 toxicity.
Implementation Method 1
the membrane layer is comprised of a material that is permeable to gas transfer across the membrane layer
Implementation Method 2
Photobioreactors (PBRs) consume CO2 and produce O2
Data Source
AI summary
Photobioreactor devices and units for the production of biomass and remediation of environmental contamination are provided. The bioreactor devices comprise a membrane photobioreactor (PBR), the PBR comprising a liquid medium, at least one photosynthetic microorganism, and at least one outer membrane layer, wherein the membrane layer is comprised of a material that is permeable to gas transfer across the membrane layer; and further comprise a chamber defining a gaseous atmosphere enclosed within, wherein the PBR is located inside the chamber. The devices also comprise a control system which controls the composition of the atmosphere within the chamber. Gas transfer occurs across the membrane layer of the PBR, between the PBR and the atmosphere comprised within the chamber. Systems comprising the devices are provided as well as methods of using the devices for the production of biomass, remediation of wastewater and removal of atmospheric pollutants.