EPDM Coarse Bubble Diffuser

Short Description:

The EPDM coarse bubble air disc diffuser generates 4–5 mm bubbles that rise quickly from the bottom of a wastewater or sewage treatment tank. These coarse bubbles create strong vertical mixing, making this type of diffuser ideal for applications where efficient water circulation is needed rather than maximum oxygen transfer.
Compared to fine bubble diffusers, coarse bubble diffusers generally provide about half the oxygen transfer efficiency for the same air volume but offer superior resistance to clogging and are suitable for demanding operating conditions.

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Product Video

This video gives you a quick look at all our aeration solutions — from Coarse Bubble Diffuser to disc diffusers. Learn how they work together for efficient wastewater treatment.

Typical Parameters

EPDM coarse bubble diffusers are widely used in various stages of wastewater treatment, including:

1. Grit chamber aeration

2. Equalization basin aeration

3. Chlorine contact tank aeration

4. Aerobic digester aeration

5. Occasional use in aeration tanks requiring high mixing

Aeration Diffusers Comparison

Compare key specifications of our full range of aeration diffusers.

Model	HLBQ-170	HLBQ-215	HLBQ-270	HLBQ-350	HLBQ-650
Bubble Type	Coarse Bubble	Fine Bubble	Fine Bubble	Fine Bubble	Fine Bubble
Image
Size	6 inch	8 inch	9 inch	12 inch	675*215mm
MOC	EPDM/Silicone/PTFE – ABS/Strengthened PP-GF
Connector	3/4''NPT male thread
Membrane Thickness	2mm	2mm	2mm	2mm	2mm
Bubble Size	4-5mm	1-2mm	1-2mm	1-2mm	1-2mm
Design Flow	1-5m³/h	1.5-2.5m³/h	3-4m³/h	5-6m³/h	6-14m3/h
Flow Range	6-9m³/h	1-6m³/h	1-8m³/h	1-12m³/h	1-16m3/h
SOTE	≥10%	≥38%	≥38%	≥38%	≥40%
SOTE	（6m submerged）	（6m submerged）	（6m submerged）	（6m submerged）	（6m submerged）
SOTR	≥0.21kg O₂/h	≥0.31kg O₂/h	≥0.45kg O₂/h	≥0.75kg O₂/h	≥0.99kg O2/h
SAE	≥7.5kg O₂/kw.h	≥8.9kg O₂/kw.h	≥8.9kg O₂/kw.h	≥8.9kg O₂/kw.h	≥9.2kg O2/kw.h
Headloss	2000-3000Pa	1500-4300Pa	1500-4300Pa	1500-4300Pa	2000-3500Pa
Service Area	0.5-0.8㎡/pcs	0.2-0.64㎡/pcs	0.25-1.0㎡/pcs	0.4-1.5㎡/pcs	0.5-0.25m2/pcs
Service Life	＞5 years

Packing & Delivery

Our coarse bubble diffusers are securely packaged to prevent damage during transit and ensure easy installation on site. For detailed packing dimensions and shipping information, please contact our sales team.