The rubber membrane tube micro-pore aerator is a core aeration device designed and manufactured by our company for aerobic biological wastewater treatment processes. This product utilizes an elastic rubber membrane tube with fine micro-pores as its core diffusion element. By generating dense and uniform microbubbles, it enhances the transfer efficiency of atmospheric oxygen into wastewater, provides dissolved oxygen required for microbial pollutant degradation, and assists in achieving effective mixing and plug flow within the tank.
- Structure and Working Principle
- Core structural composition
The device is a modular linear unit, primarily comprising:
- Elastic rubber membrane tube: A key functional component, made of materials such as ethylene propylene diene monomer (EPDM), with a surface molded with numerous micropores. The membrane tube is secured to the supporting liner tube via a stainless steel clamp, forming a tubular aeration unit that can be expanded and retracted.
- Supporting liner and air distribution pipe: The supporting liner, typically made of engineering plastics (ABS, UPVC), supports the membrane tube, evenly distributes airflow, and connects to the main air distribution pipeline. A check valve structure can be designed at the air inlet to prevent sewage backflow during air shutdown.
- Connection and fixation system: includes stainless steel (e.g. SS304) clamps, brackets, and connectors for securely mounting the aerator module to the pool bottom.
- Working Principle
The compressed air enters the support liner through the main air distribution pipe. The air pressure causes the elastic rubber membrane surrounding the liner to expand, allowing the air to uniformly escape through the micropores on the membrane, forming numerous fine-diameter bubbles in the water.
- Aeration state: During gas supply, the micropores of the membrane tube open under air pressure.
- At rest: When gas supply is stopped, the membrane tube retracts and closes under elastic and hydrostatic pressure, with micropores sealed. This helps prevent sewage and impurities from entering the interior, thereby reducing the risk of clogging.
- Core technical features
- Dynamic micropore and anti-clogging characteristics: The "linear stretchable" design of the elastic membrane tube ensures that the micropores close when gas supply is interrupted, which may help reduce impurity intrusion and pore blockage, making maintenance relatively simple.
- Oxygen transfer efficiency and mixing effect: The generated bubbles are fine and uniformly distributed along the tube length, resulting in a large gas-liquid contact area, which typically contributes to achieving higher oxygen transfer efficiency. Linear arrangement may positively influence the formation of a push flow and reduce sludge deposition at the pool bottom.
- Membrane tube materials are available: EPDM (suitable for municipal wastewater) and other options are typically provided, allowing selection based on specific water quality conditions.
- Operating resistance and energy consumption: The operating resistance remains relatively stable under new installation conditions. After prolonged operation, resistance variations correlate with water quality and maintenance status. The tubular structure facilitates localized lifting and cleaning, while regular maintenance helps maintain performance.
- Installation and Maintenance: The modular design requires attention to the leveling and fixation of the pipeline at the pool bottom during installation. When replacing the membrane tube, the membrane tube component can typically be replaced individually, making the operation relatively convenient.
- Main Technical Parameters
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Parameter item
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Description / Reference range example
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Standard length of the membranous tube
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Common specifications: 500mm, 750mm, 1000mm
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service area
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The empirical reference range for service area per meter of pipe length is approximately 0.5–1.5 m²/m.
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standard tidal volume
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The designed air volume of single-membrane tubes in clear water is commonly 2–8 m³/h·m.
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Solute Oxygen Transfer Efficiency (SOTE, clear water)
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Under standard test conditions (water depth 4-6m), the empirical value typically ranges from 20% to 30%.
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dynamic wet resistance
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It is related to water depth, aeration rate, and the age of the membrane tube, with a common range of 4.0–6.5 kPa.
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Membrane material
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Optional materials include ethylene propylene diene monomer (EPDM) rubber.
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Material of support tube/connector
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Options include ABS, UPVC, SS304, etc.
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- Typical Application Areas
This equipment is suitable for various aeration biological treatment processes, particularly for linear arrangement in plug-flow tanks.
- Municipal wastewater treatment: AAO, oxidation ditch and other processes in aerobic tank and nitrification tank.
- Industrial wastewater treatment: biochemical aeration tanks and renovation of existing aeration systems for food, chemical, paper, pharmaceutical and other industries.
- Other: Suitable for aeration and oxygenation projects in river channels, landscape water bodies, and aquaculture water bodies.
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