Fine Bubble Tubular Diffuser
Tube-shaped membrane diffusers (AIRFIN 1/2/3/4) that release fine bubbles for high oxygen transfer efficiency in aeration tanks, available in Ø63 to Ø114 mm sizes.
AIRFIN Fine Bubble Tubular Diffusers are high-performance tube-shaped membrane diffusers designed for maximum oxygen transfer efficiency in wastewater aeration tanks. Available in four models — AIRFIN 1 (Ø63 mm), AIRFIN 2 (Ø75 mm), AIRFIN 3 (Ø90 mm), and AIRFIN 4 (Ø114 mm) — they cover air flow demands from 2 to 70 m³/hr per diffuser.
Each diffuser features an EPDM, Silicon, or HTPU membrane over a corrosion-free ABS + uPVC/PP support pipe, producing fine bubbles of 1–2 mm (up to 4 mm on AIRFIN 4) for high SOTE — up to 37.5% at 3 m water depth. Selectable perforation sizes (0.65–2 mm) let the diffuser be tuned to match process air demand and efficiency targets.
Factory assembled for ease of operation, the diffusers feature backflow prevention, a self-purging system, and fixed or floating (retrievable) designs. Systems are expandable in the field without special tools and support mechanical or chemical cleaning for clogged diffusers.
Key features
- EPDM/Silicon/HTPU membrane options with selectable perforation sizes (0.65–2 mm)
- ABS + uPVC/PP corrosion-free support pipe — no metallic parts in the tank
- Fine bubble size of 1–2 mm (up to 4 mm on AIRFIN 4) for maximum oxygen transfer
- Buoyant and non-buoyant designs with fixed/floating (retrievable) options
- Factory assembled diffuser for ease of operation
- Self-purging system with backflow prevention
- Maximum life expectancy of 7–8 years with regular cleaning frequency
- System expandability in field without special tools
- Mechanical/chemical cleaning system for clogged diffusers
- Partial or complete replacement systems available
Outcomes
- Up to 37.5% SOTE at 3 m water depth (AIRFIN 3)
- Up to 15.2 kg O₂/kWh aeration efficiency
- Air flow range from 2 to 70 m³/hr across the product line
- Active surface area from 0.21 to 0.49 m² per diffuser
Who it's for
Municipal and industrial wastewater treatment plants, sewage treatment plants, activated sludge systems, aerated lagoons, oxidation ponds, aerobic digesters, and process industries including pharmaceutical, food & beverage, chemical, textile, leather, pulp & paper, and aquaculture.
Models & variants
Four tubular fine-bubble diffuser models from Ø63 mm to Ø114 mm, covering air flows from 2 to 70 m³/hr.
Ø63 mm tubular fine-bubble diffuser, 1020 mm length, for standard aeration duties.
| Spec | Value |
|---|---|
| Size | Ø63 × 1020 mm (2.6" × 40") |
| Membrane ID | Ø63 mm |
| Perforation length & count | 1000 mm / 14,080 nos. |
| Perforation size | 0.65 / 1 / 1.2 / 1.5 mm |
| Active surface area | 0.21 m² |
| Air flow range / diffuser | 2–15 m³/hr |
| Bubble size | 1–2 mm |
| Standard design flow @ 3 m | 10 m³/hr |
| SOTE @ 3 m (1 mm perforation) | 18.06% |
| Typical standard aeration efficiency | 6.8–5.1 kg O₂/kWh |
| Area of influence | 0.4–1.5 m² |
| MOC of support pipe | ABS + uPVC/PP – Ø63 mm OD |
| Weight | 1.8 kg |
Performance envelope
Operating range across AIRFIN 1–4 models, rated at 3 m water depth with 1 mm perforation.
| Metric | Min | Max | Unit |
|---|---|---|---|
| Air flow per diffuser (AIRFIN 1: 2–15 · 2: 2–20 · 3: 2–20 · 4: 4–70) | 2 | 70 | m³/hr |
| Standard design flow @ 3 m (AIRFIN 1: 10 · 2: 12 · 3: 15 · 4: 36) | 10 | 36 | m³/hr |
| SOTE @ 3 m (1 mm perforation) (AIRFIN 1: 18.06% · 2: 25.26% · 3: 37.5% · 4: 30%) | 18.06 | 37.5 | % |
| Aeration efficiency | 5.1 | 15.2 | kg O₂/kWh |
| Active surface area | 0.21 | 0.49 | m² |
| Area of influence | 0.4 | 4.5 | m² |
| Weight | 1.8 | 7 | kg |
Common construction
Specifications shared across AIRFIN 1–4 models.
| Specification | Value |
|---|---|
| Membrane material | EPDM / Silicon / HTPU |
| Perforation size options | 0.65 / 1 / 1.2 / 1.5 / 2 mm |
| Bubble size | 1–4 mm |
| Material of support pipe | ABS + uPVC/PP |
| Backflow prevention | Yes |
| Self-purging system | Yes |
| Design type | Fixed / Floating (Retrievable) |
| Life expectancy | 7–8 years with regular cleaning |
Applications
Activated sludge systems
Fine-bubble aeration for conventional and extended-aeration activated sludge processes.
Municipal STPs & sewage treatment
Oxygen transfer for municipal sewage and wastewater treatment plants.
Industrial ETPs
Process aeration for pharmaceutical, chemical, textile, food & beverage, leather, and pulp & paper effluent treatment.
Aerated lagoons & oxidation ponds
Aeration for stabilisation ponds and lagoon-based treatment systems.
Aquaculture
Dissolved oxygen supply for aquaculture process water.
Focus areas
- Waste Water Treatment