Products Description
The EPDM diffuser membrane is available in diaphragm disc form. It is a new type of microporous aeration device used in the treatment of industrial wastewater and municipal domestic sewage. It features a large air flow capacity, low head loss, strong lifting capability, and high oxygenation efficiency.
A large number of micropores are distributed on the diaphragm. When air is supplied, the pores open to form fine bubbles; when the air supply stops, the pores close automatically. This prevents sewage and debris from entering the air pipeline and clogging the aerator.
The EPDM diffuser membrane is corrosion-resistant and oxidation-resistant, and offers the advantages of light weight, high strength, fine and uniform bubble formation, and resistance to clogging. It is especially effective in ozone aeration applications. Microporous aerators are widely used in ozone disinfection for drinking water and reclaimed water reuse, aeration in sewage treatment tanks, and oxygenation in fermentation processes.
It is essential equipment for blower-based aeration and oxygenation systems. The selection of aeration equipment not only affects the biochemical treatment performance of sewage but also influences land requirements, capital investment, and operating costs of wastewater treatment facilities.
The diffuser features a small bubble diameter, a small gas–liquid interface diameter, a large gas–liquid contact area, uniform bubble distribution, resistance to pore blockage, and strong corrosion resistance. It is particularly suitable for municipal sewage treatment plants, large-scale industrial facilities under new construction or expansion, and renovation projects of existing aeration tanks. The aeration tank can also be operated intermittently.
Precision drilling enables efficient oxygen transfer and utilization:
To meet the requirements of different aeration systems, various drilling patterns can be used to adjust operating pressure, including different slit lengths, spacings, and drilling densities. The drilling diameter ranges from 184 to 295 mm. A variety of standard and special membrane materials are formulated to suit a wide range of applications.
Membrane materials include:
EPDM: Suitable for municipal wastewater
Low-plasticizer EPDM: Suitable for industrial wastewater from animal slaughtering, food processing, and beverage production
All membrane materials are designed using advanced technology to prevent surface clogging, solid deposition, biological fouling, and crust formation.
The microporous aeration disc adopts a modular design. Its main body consists of a double-layer composite structure composed of an ABS engineering plastic support frame and an EPDM rubber diaphragm. The ABS frame is formed into a honeycomb support skeleton through an injection molding process, providing a compressive strength of up to 12 kN/m². It also features a lightweight design, with a single-disc weight of ≤ 1.2 kg.
The EPDM diaphragm is tightly bonded to the support frame through a hot-pressing process. Laser-cut micropores with diameters of 80–100 μm are uniformly distributed across the surface, with a pore density of 3,000–4,000 holes/m². The diaphragm edge adopts a double-layer sealing ring design combined with a double-socket connection method, enabling it to withstand continuous airflow impact under a working pressure of 0.03 MPa.
The specially designed self-closing pore structure automatically seals when aeration stops. In combination with silicone-reinforced ribs (tear resistance ≥ 25 kN/m), this design effectively prevents diaphragm deformation and the intrusion of impurities. Overall, the structure balances mechanical strength and elastic deformation capacity, laying a solid foundation for achieving high oxygen transfer efficiency and corrosion resistance.
The key to improving oxygen utilization in microporous aeration discs lies in optimizing gas diffusion efficiency and bubble residence time. Due to its high elasticity, the EPDM rubber diaphragm expands uniformly during aeration, generating microbubbles with diameters of 0.5–2 mm. This increases the gas–liquid contact area by more than 40% compared with conventional aeration equipment.
Laser cutting ensures pore diameter accuracy within ±5 μm and pore spacing tolerance within 0.2 mm, resulting in highly uniform bubble distribution. By adjusting the aeration disc inclination angle (recommended 5°–8°) and aeration intensity (0.05–0.15 m³/min·m²), the bubble rise path can be extended to 1.2–1.8 m, increasing the oxygen transfer efficiency to a critical value of 35%.
During installation, a pressure-balancing design for the aeration network should be implemented. A variable-diameter branch pipe system (gradually transitioning from DN25 to DN50) is recommended to maintain a pressure differential of ≤ 50 Pa between aeration units, thereby eliminating localized over-aeration or under-aeration. During operation, a 3:1 intermittent aeration mode is recommended to take advantage of the secondary shear effect generated by bubble collapse, further enhancing oxygen dissolution efficiency.
Key Indicators for Installation Flatness Control
In practical construction, the flatness of the tank bottom directly affects air distribution efficiency and the service life of the microporous aeration disc. Engineering specifications require the horizontal deviation of the tank foundation to be strictly controlled within ≤ 3 mm/m. Construction teams typically use laser leveling instruments combined with mortar leveling to perform multi-directional calibration across different areas.
The recommended spacing between branch pipes is 800–1,000 mm. Excessive spacing may result in localized aeration blind zones, while spacing that is too narrow can cause airflow interference. For pipe connections, the double-socket structure must pass a 0.2 MPa pressure test to ensure an interface leakage rate of less than 1.5%.
It should be noted that sharp objects or sediment layers exceeding 5 mm in thickness on the tank bottom can cause uneven stress on the diaphragm, accelerating fatigue cracking of the rubber material.
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