Tubular Bio-Electrical Modules for Scalable Gas Production
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Solution Overview
Problem
Bio-electrical systems (BES) face inefficiencies in space utilization and energy consumption due to suboptimal reactor designs, particularly in wastewater treatment, where cylindrical electrodes provide limited surface area and poor electrical contact, leading to reduced reaction kinetics and scalability issues for various applications, especially under high pressure or unstable conditions.
Innovation Solution
A tubular BES design featuring a conductive outer electrode as housing and an inner electrode filled with active biological material, with controllable gas outlets and integrated shutters for electrolyte flow control, allowing for modular operation and improved surface-to-volume ratios, enabling efficient gas collection and energy use across diverse applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cylindrical electrodes are used in BES, then the reactor structure is simple, but the surface area to volume ratio is limited and electrical contact is poor
Solution Approach 1:
The patent implements a nested electrode configuration where an inner cylindrical electrode is placed inside an outer cylindrical electrode. This nested structure increases the total active surface area for biological reactions while maintaining a compact reactor footprint. The inner electrode provides additional reaction surface that would not be available in a single-cylinder design, directly addressing the surface area limitation.
Solution Approach 2:
The patent transitions from a two-dimensional surface (single cylindrical electrode) to a three-dimensional volumetric structure (nested concentric cylinders). This dimensional expansion allows the system to utilize the entire volume between the inner and outer electrodes for biological reactions, significantly increasing the effective surface area to volume ratio without proportionally increasing the reactor's external dimensions.
2Ease of manufacture
If cylindrical electrodes are used in BES, then the reactor structure is simple, but the electrical contact and reaction kinetics are reduced
Solution Approach 1:
The nested electrode configuration creates multiple pathways for electron transfer and enhances electrical contact between the electrodes and biological material. The inner electrode serves as an additional electron source/sink, improving the efficiency of electrochemical reactions and accelerating reaction kinetics compared to a single electrode design.
Solution Approach 2:
The patent applies different functional qualities to different regions of the electrode system. The inner electrode can be optimized for specific reactions (e.g., hydrogen production) while the outer electrode handles other functions (e.g., methane production or wastewater treatment). This local optimization of electrode properties enhances overall reaction kinetics by matching electrode characteristics to specific reaction requirements.
3Ease of operation
If conventional BES designs are used, then the system is simple to operate, but space utilization is inefficient and scalability is limited
Solution Approach 1:
The nested electrode design maximizes space utilization by placing the inner electrode within the outer electrode, effectively using the entire reactor volume for productive biological reactions. This eliminates dead space and ensures that all reactor volume contributes to the desired output, thereby improving volumetric productivity without complicating operation.
Solution Approach 2:
The dual-electrode reactor can be configured to perform multiple functions simultaneously or sequentially. For example, it can produce both hydrogen and methane, treat wastewater while generating energy, or operate in different modes (electrolysis, fuel cell, anaerobic digestion) by adjusting operational parameters. This multi-functionality enhances space utilization efficiency by making the same reactor volume serve multiple purposes.
4Device complexity
If conventional BES designs are used, then the system is simple, but energy consumption is high under high pressure or unstable conditions
Solution Approach 1:
The inner and outer electrodes can be independently controlled with different electrical potentials, allowing optimization of energy consumption for specific reactions. The system can apply energy only where needed and at the minimum required level, rather than uniformly across the entire reactor. This localized energy application reduces overall energy consumption, especially important under high pressure or unstable operating conditions.
Solution Approach 2:
The patent enables dynamic adjustment of electrical parameters (voltage, current density) for each electrode independently. This allows the system to adapt to changing operating conditions (pressure, temperature, substrate availability) by optimizing energy input in real-time, thereby reducing energy consumption under unstable conditions while maintaining high productivity.
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 tubular design enhances reaction kinetics, reduces startup time, and allows for scalable, energy-efficient operation under high pressure and unstable conditions, facilitating versatile applications including wastewater treatment and energy conversion.
Implementation Method 1
The present invention relates to bio-electrical systems (BES), and more specifically to systems and methods used for microbial electrolysis
Implementation Method 2
The inner electrode is filled with active biological material
Implementation Method 3
When pressurized storage or transport is needed, gas compressors are used which waste more energy compared with hydrostatic pressure generators
Implementation Method 4
Each module can be controlled by an electrochemical algorithm
Data Source
AI summary
The invented bio-electrical system is a housing-electrode which allows insertion of another electrode for various electrochemical and bio-electrical applications. Together with other invented elements as well as standard components, the system is fully scalable, modular, and allows production and collection of gases under pressure. It can be built in many shapes, such as the embodied tubular shape. The design allows operation on unstable ground, for example on ships. Flow of electrolyte can be regulated and directed in cascaded reactions by opening and closing the compartments of the outer or the inner electrodes using the provided electrode holders. The redox conditions inside the system can be controlled using off-the-shelf power supplies which are controlled using the provided algorithm. Gas collection can be regulated based on the level of liquid inside the system using the provided float switches or conductivity probes even as the system is moving or operated under zero-gravity conditions.