Diffused Aeration Systems
High-efficiency fine bubble aeration with tubular and disc diffusers — delivering superior oxygen transfer at 30–50% lower energy than conventional aerators
Overview
What is Diffused Aeration Systems?
Diffused aeration systems introduce compressed air into wastewater through submerged membrane diffusers, generating fine bubbles that maximize oxygen transfer efficiency. Two primary diffuser configurations are available: tubular diffusers, which are installed along the length of aeration tanks and provide uniform air distribution across large areas; and disc diffusers, which are mounted at fixed points and offer high oxygen transfer rates in more compact installations.
Both configurations are available with EPDM or silicone membranes. EPDM is the standard choice for most municipal and industrial applications, offering reliable performance across a wide range of wastewater types. Silicone membranes are plasticizer-free, weathering-resistant, oil-resistant, and thermally stable — making them the preferred choice for industrial applications with elevated temperatures, solvents, or aggressive chemicals. Both membrane types generate fine bubbles below 1.0 mm, maximizing the air–water contact area and oxygen transfer rate.
Diffused aeration systems deliver oxygen transfer efficiencies 30–35% better than jet aerators and up to 50% better than surface aerators, directly reducing blower energy — typically the largest operating cost in a biological treatment plant. Their submerged installation eliminates spray and aerosol generation, and the low-incrustation membrane design ensures sustained performance over extended operating periods with minimal maintenance.
Process
How Diffused Aeration Works
Air Supply
Blowers or compressors supply compressed air at the pressure required to overcome hydrostatic head and membrane back-pressure. Air flow is controlled to maintain target dissolved oxygen (DO) levels in the tank.
Distribution Manifold
Air is distributed through a header and lateral pipe network along the tank floor, delivering uniform airflow to each diffuser element across the aeration zone.
Membrane Diffusion
Compressed air passes through the EPDM or silicone membrane, which flexes to release fine bubbles below 1.0 mm diameter. The membrane self-seals when air flow stops, preventing liquid ingress.
Oxygen Transfer & Mixing
Fine bubbles rise slowly through the liquid column, maximizing oxygen transfer. The rising bubble plume also creates circulation and mixing in the tank, preventing sludge settlement and maintaining biomass in suspension.
Benefits
Key Advantages
- Fine bubble generation below 1.0 mm — maximum oxygen transfer efficiency
- 30–35% energy saving versus jet aerators; up to 50% versus surface aerators
- Silicone membrane option is plasticizer-free, oil-resistant, and heat-tolerant for industrial applications
- Low-incrustation membrane surface maintains consistent performance over time
- Self-sealing membrane prevents backflow of liquid when air is off
- Wide operating temperature range with minimal performance degradation
- Good pressure recovery characteristics enable efficient system restart
- No spray or aerosol generation — improved operator safety and odor control
Applications
Industries & Use Cases
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