Products Description

An Aeration Disc Diffuser is a fine bubble aeration device widely used in biological wastewater treatment systems. It is normally installed at the bottom of an aeration tank and connected to an air blower.

Compressed air is released through the microporous membrane as fine bubbles, providing oxygen for microorganisms while also promoting water circulation inside the tank.

The disc aeration diffuser is commonly used in municipal sewage treatment, industrial wastewater treatment, activated sludge tanks, MBBR systems, SBR tanks, and other biological treatment processes.

Aeration Disc Diffuser Working Principle

Compressed air from the blower enters the air distribution pipe and flows into the fine bubble disc diffuser. The microporous membrane expands under air pressure, allowing air to pass through small slits and form large quantities of fine bubbles.

Blower → Air Pipe → Disc Diffuser → Fine Bubbles → Oxygen Transfer

Because fine bubbles have a larger gas-liquid contact area and rise relatively slowly, oxygen has more time to transfer into the wastewater.

When the air supply stops, the membrane closes, helping prevent wastewater from flowing back into the air pipeline.

Oxygenation and Mixing in Aeration Tanks

The aeration disc diffuser mainly performs two functions:

Oxygenation

Fine bubbles increase dissolved oxygen in wastewater, providing the oxygen required by aerobic microorganisms to break down organic pollutants.

Mixing

The rising bubbles create water circulation inside the aeration tank, helping keep activated sludge and suspended solids evenly mixed and reducing sedimentation.

This improves contact between oxygen, wastewater, and microorganisms, supporting stable biological treatment.

Aeration Disc Diffuser Features

Aeration disc diffusers are designed for reliable wastewater aeration.

Fine bubble size of approximately 1–3 mm
Microporous membrane with 80–100 μm openings
EPDM and silicone membrane options
ABS engineering plastic diffuser body
High oxygen transfer efficiency
Non-return design helps prevent liquid backflow
Reverse-folding structure improves membrane sealing
Replaceable membrane for easier maintenance
Suitable for continuous biological wastewater treatment

Aeration Disc Diffuser Technical Parameters

Material	Model	Inner tube diameter (mm)	Membrane diameter (mm)	Membrane thickness (mm)	Bubble diameters (mm)	Air flow range (Nm3/h)	Oxygen utilization at 5m (%)	Max. Working temperature (°C)
ABS+EPDM	D65-500	63	65	2	0.8-2	1.7-6.8	23-32	80
ABS+EPDM	D65-750	63	65	2	0.8-2	3.4-13.6	23-32	80
ABS+EPDM	D65-1000	63	65	2	0.8-2	3.4-17	23-32	80
ABS+EPDM	D90-1000	88	90	2	0.8-2	6.5-32.6	23-32	80
ABS+Silicone	D65-500	63	65	2	0.8-2	1.7-6.8	23-32	100
ABS+Silicone	D65-750	63	65	2	0.8-2	3.4-13.6	23-32	100
ABS+Silicone	D65-1000	63	65	2	0.8-2	3.4-17	23-32	100
ABS+Silicone	D90-1000	88	90	2	0.8-2	6.5-32.6	23-32	100