The corundum disc micro-pore aerator is a high-performance, durable core aeration device designed and manufactured by our company for aerobic biological wastewater treatment processes. Featuring sintered corundum (alumina ceramic) as its core diffuser disc, this product releases bubbles through its internally uniform and densely interconnected micro-pores. It provides a corrosion-resistant, aging-resistant, and stable aeration solution, particularly suitable for complex water environments with stringent equipment lifespan requirements.
- Structure and Working Principle
- Core structural composition
The device is a modular unit with a robust structure, primarily comprising:
- Alumina aerated discs: Key functional components, fabricated from high-strength sintered alumina, featuring numerous uniform microporous channels internally. These discs exhibit high hardness, exceptional wear resistance, and superior acid-alkali corrosion resistance.
- Chassis and connectors: Typically fabricated from engineering plastics (e.g., ABS) or corrosion-resistant metals (e.g., SS316 stainless steel), these components support and seal the corundum discs while connecting to the gas distribution piping. The chassis is generally designed with a check valve structure to prevent backflow of contaminated water during gas shutdown.
- Aeration piping system: Conveying air from the blower to aeration units, typically using UPVC, ABS, or stainless steel pipes.
- Working Principle
The compressed air enters the aeration device through the pipeline, and penetrates the tortuous micro-pore channels inside the corundum disc under the pressure, and is cut into fine and uniform bubbles when it contacts the water on the surface of the disc.
- Aeration state: During continuous aeration, the airflow stably passes through the rigid micropores.
- At rest: When gas supply is stopped, the intake port is closed using hydraulic pressure or mechanical check valves. The corundum disc itself is a rigid porous medium with no dynamic opening/closing function, and its anti-clogging performance depends on the uniformity of pores and the smoothness of the material.
- Core technical features
- Exceptional durability and stability: Alumina (alumina ceramic) exhibits remarkable chemical inertness, resisting corrosion from acids, alkalis, organic compounds, and oils without aging. It offers a long theoretical service life with relatively slow performance degradation.
- Stable oxygen transfer efficiency: The rigid microporous structure ensures uniform bubble size distribution. Under long-term operation, its porosity and aeration efficiency may remain relatively stable.
- High mechanical strength and anti-clogging properties: The disc exhibits high hardness and wear resistance, capable of withstanding certain physical impacts and friction. The smooth and hard pore walls are less prone to biofilm adhesion, and combined with regular cleaning, this contributes to maintaining a low risk of clogging.
- The higher operation resistance: Because of the tortuous and slender micro-pore channels of corundum, the initial aeration resistance is usually higher than that of the elastic diaphragm aerator, and the operation resistance may increase with the surface blockage, which puts forward the corresponding requirements for the selection of blower.
- Maintenance and Cleaning: The disc itself does not require replacement, but regular physical or chemical cleaning is necessary to remove surface contaminants and restore ventilation performance. The cleaning cycle is closely related to water quality.
- Main technical parameters
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Parameter item
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Description / Reference range example
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disk outer diameter
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Common specifications: Φ178mm, Φ215mm, Φ260mm, Φ300mm
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service area
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The recommended service area for a single unit is approximately 0.25 to 0.6 m² per unit.
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standard tidal volume
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The designed ventilation rate for single-layer systems in clear water is commonly 1.0–2.5 m³/h·unit.
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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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Correlated with water depth and aeration volume, the initial resistance typically ranges from 5.0 to 8.0 kPa, which is generally higher than that of an elastic membrane aerator.
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Disc material
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Sintered corundum (alumina ceramic), typically with a purity of ≥95%
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Chassis/Connector Material
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Options include ABS, UPVC, and stainless steel (SS304/SS316).
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applicable operating temperature
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The ceramic plate itself can withstand relatively high temperatures, with the specific range limited by the sealing material.
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- Typical Application Fields
This equipment is particularly suitable for aeration scenarios requiring special durability and corrosion resistance in aerators.
- Industrial wastewater treatment: biochemical treatment units for strong acids, strong alkalis, or high-concentration organic wastewater generated by industries such as chemical, pharmaceutical, electroplating, metallurgy, and pesticide production.
- Municipal sewage treatment: side flow treatment section with high ammonia nitrogen and corrosive sludge digested liquid.
- Other harsh environments: leachate treatment, certain seawater desalination pretreatment aeration, etc.
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