Leaf spring diffuser | Solutions | METAWATER

Features

No Clogging

Thanks to its large discharge port, concerns about clogging are eliminated. This design stands in contrast to membrane-type or porous diffusers, which often require maintenance to prevent blockage. As such, leaf spring diffusers are well-suited for intermittent operations.

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Durable and Non-Degrading

Constructed solely from a robust main body made of ABS resin, this diffuser boasts excellent rigidity, shock resistance, and resilience against oil, grease, heat, and various chemicals. The leaf spring is crafted from SUS301, ensuring longevity. Without membranes or rubber components that can degrade, users have reported operational periods extending over 20 years without the need for maintenance.

No Orifice Required for Airflow Rate Adjustment

The aperture of the discharge port is determined by the equilibrium between supply air pressure and the leaf spring's elastic force, allowing for compatibility across a broad spectrum of airflow rates. This characteristic frees users from the need for precise airflow adjustments or management.

No Check Valve Needed

The elastic force and water pressure ensure that the leaf spring closes the discharge port once the aeration airflow ceases, preventing any wastewater from reversing flow back into the main body or piping system.

Reduced Adhesion of Solids and Slime

An air screen forms around the main body due to the resonance produced by the leaf spring during air supply. This mechanism, combined with the air bubbles generated from beneath the diffuser, minimizes the adhesion of solids and slime, while preventing fibrous materials from entangling.

Why Rubber Porous Air Diffusers Are Not Ideal for Industrial Wastewater Treatment

Globally, rubber porous air diffusers are widely used for wastewater treatment, designed in either rod or disk shapes with a rubber membrane featuring fine pores. Originally developed for sewage treatment, their application in industrial wastewater contexts exposes significant weaknesses:

Clogging

Rubber porous air diffusers often clog within a short timeframe when exposed to the high concentrations of activated sludge present in industrial wastewater treatment facilities.

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Significant Reduction in Oxygen Transfer Rate

While rubber porous air diffusers may be perceived as having a high Oxygen Transfer Rate (OTR), the reality in practical applications, especially within the challenging environment of industrial wastewater, tells a different story. Research indicates that the OTR can plummet to troubling low levels, with an Alpha value dropping to approximately 0.2 in severe instances, meaning only 6% of the OTR observed in clean water is effectively delivered in actual wastewater conditions.

Sludge Build-Up at the Bottom of Tanks

Rubber porous diffusers emit small air bubbles that are often insufficient in buoyancy to effectively churn and aerate the tank contents, resulting in subsequential sludge accumulation. While this is not a significant issue in sewage treatment—where activated sludge concentrations are lower—it becomes a critical concern in industrial wastewater systems.

Though rubber porous air diffusers may perform adequately in sewage treatment settings, they are inherently unfit for the rigors of industrial wastewater management. This discrepancy is evidenced when evaluating the total aeration capability required by such systems.

Reference: Can Microbubble Generators Replace Traditional Air Diffusers?

Some companies advocate for microbubble generators as a modern solution for aeration, but their efficacy must be scrutinized against total aeration capacity. Despite showing high OTR percentages, these systems often yield insufficient volumes of oxygen-rich water across extensive wastewater volumes, raising questions about their practical utility.

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