Multi-Layer Membrane for Wastewater Gas Recovery
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Solution Overview
Problem
Wastewater treatment processes consume significant energy due to the need for aeration of organic compounds, which can be reduced by extracting energy-rich gases like hydrogen and methane from wastewater using immobilized bacteria within a composite membrane system.
Innovation Solution
A multi-layer membrane system with immobilized bacteria, where the bacteria produce gases like hydrogen and methane during wastewater treatment, which are then efficiently collected and extracted, reducing the energy required for aeration by partially breaking down organic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional aeration processes are used to treat organic compounds in wastewater, then organic contaminants are broken down, but significant energy is consumed
Solution Approach 1:
The system employs bacteria that autonomously degrade organic compounds in wastewater and convert them into energy-rich gases (hydrogen and methane) without requiring external energy input for aeration. The bacteria self-service by metabolizing the organic matter and producing usable energy carriers, eliminating the need for energy-intensive mechanical aeration while maintaining high degradation rates
Solution Approach 2:
The system changes the operational parameters from aerobic aeration to anaerobic or micro-aerophilic conditions, enabling bacteria to convert organic degradation into energy-rich gas production. This parameter shift transforms the process from energy-consuming to energy-generating, as the bacteria operate under conditions that favor hydrogen and methane production rather than simple carbon dioxide generation
2Productivity
If bacteria are immobilized within composite membrane layers, then gas production is optimized and bacteria are protected, but system complexity increases
Solution Approach 1:
The system divides the membrane into multiple functional layers: outer layers containing immobilized bacteria for gas production, and an inner dry matrix layer for gas collection and transmission. This segmentation allows each layer to perform its specific function optimally - the outer layers protect and nurture the bacteria while the inner layer efficiently captures and conveys the produced gases to the surface
Solution Approach 2:
The system employs a composite membrane structure combining different materials with complementary properties: the outer layers use materials suitable for bacterial immobilization and protection, while the inner layer uses a dry matrix material optimized for gas absorption and transmission. This composite approach integrates multiple material functionalities into a single system that simultaneously protects bacteria and maximizes gas recovery
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 enhances gas recovery and reduces energy consumption in wastewater treatment by utilizing immobilized bacteria to produce clean-burning gases like hydrogen and methane, which can be used as energy sources or industrial products, while minimizing post-processing requirements.
Implementation Method 1
Bacteria can be immobilized within the composite membrane, such as within at least one of the layers, wherein the bacteria can produce the gas during treatment of the wastewater
Implementation Method 2
Examples can include composite membranes having multiple layers or sheets to increase surface area and provide a low resistance path of the gas from the bacteria-containing layers to the gas-filled layers
Implementation Method 3
The multiple layers can include a gas-filled layer surrounded by bacteria-containing layers, such that the bacteria-containing layers are in communication with the gas-filled layer to allow the produced gas to pass into the gas-filled layer
Data Source
AI summary
Systems and methods for producing and extracting a gas from a wastewater fluid including multiple sheets or layers that form a composite membrane. The composite membrane includes a sandwich structure in which a dry matrix layer is surrounded by a first layer including a first immobilized bacteria and a second layer including a second immobilized bacteria. The first immobilized bacteria and the second immobilized bacteria can be configured to produce a gas from one or more compounds in a wastewater fluid. The dry matrix layer can be configured to receive the gas from the first and second layers, and the gas can be extracted from the membrane. The hydrophobic coatings can be disposed between the dry matrix layer and one or both of the first and second layers. An adhesive interface can be disposed between the dry matrix layer and one or both of the first and second layers.