Circular Spiral Aeration Units
Engineered for a variety of aeration basin geometries, Mapal’s circular spiral aeration unit delivers uniform oxygen distribution and effective mixing across the basin. The spiral layout supports consistent biological treatment performance with stable operating conditions. Its relatively compact dimensions make this unit especially suitable for emergency and temporary aeration applications. Available in stationary (floor-sitting) and floating configurations with tubular or disc diffusers, the modular stainless-steel design supports drop-in deployment without draining.
Available Configurations
Stationary Circular Spiral Tubular Diffuser
Designed for a wide range of basin geometries, the stationary circular spiral configuration provides uniform oxygen distribution and effective mixing across the basin, supporting stable and efficient biological treatment performance. Its relatively compact dimensions make it especially suitable for emergency and temporary aeration applications.
This configuration incorporates PP/PE inner tubes with fine-bubble membrane sleeves.
The unit features a marine-grade stainless steel (304/316) structure for durability and long service life. It is crane-installed (drop-in), fully retrievable, and suitable for installation in live reactors without draining, minimising downtime and operational disruption.
Technical Snapshot
| Parameter | Description |
|---|---|
| Diffuser length range | 2000-4500 mm |
| Airflow per 1 m tubular diffuser | 4-12 m³/h |
| Configuration | Floor-resting spiral |
| Diffuser Type | Tubular (EPDM, Silicone, PU) |
| Structure Material | Stainless Steel 304 / 316 |
| Installation Method | Crane-installed (drop-in) in live reactors |
| Maintenance | Fully retrievable |
| Retrofit Compatibility | Excellent |
Floating Circular Spiral Tubular Diffuser
Mapal’s floating circular spiral-configured aeration unit is suitable for a wide range of basin geometries. It is engineered to deliver uniform oxygen distribution and effective mixing across the entire basin, supporting stable and efficient biological treatment performance. Its relatively compact dimensions make it especially suitable for emergency and temporary aeration applications.
This configuration incorporates PP/PE inner tubes with fine-bubble membrane sleeves, and a stabilising system of UV-resistant polypropylene floats. The unit is secured in place to ensure stable operation under varying conditions.
The unit features a marine-grade stainless steel (304/316) structure, ensuring durability and long service life. It is crane-installed (drop-in), fully retrievable, and suitable for installation in live reactors without draining, minimising downtime and operational disruption.
Operational Flexibility
The floating unit can provide a complete aeration solution, operate over existing fixed-floor diffusers, work alongside surface aerators for supplemental oxygen, or replace malfunctioning equipment.
Technical Snapshot
| Parameter | Description |
|---|---|
| Diffuser length range | 2000-4500 mm |
| Airflow per 1 m tubular diffuser | 4-12 m³/h |
| Configuration | Floating |
| Diffuser Type | Tubular (EPDM, Silicone, PU) |
| Structure Material | Stainless Steel 304 / 316 |
| Installation Method | Crane-installed (drop-in) in live reactors |
| Maintenance | Fully retrievable |
| Retrofit Compatibility | Excellent |
| Floating Configuration Feature | Incorporates a balancing system of UV-resistant polypropylene floats and is harnessed in place for stable operation. |
Stationary Circular Spiral Disc Diffuser
Mapal’s floor-resting circular spiral aeration unit equipped with disc diffusers is designed for a wide range of basin geometries. It delivers high oxygen transfer efficiency and uniform performance across the basin, supporting stable biological treatment. Its relatively compact dimensions also make it especially suitable for emergency and temporary aeration applications.
Mapal’s circular spiral aeration units equipped with disc diffusers are compatible with disc diffusers from any manufacturer.
The unit features a marine-grade stainless steel (304/316) structure, ensuring durability and long service life. It is crane-installed (drop-in), fully retrievable, and suitable for installation in live reactors without draining, minimising downtime and operational disruption.
Technical Snapshot
| Parameter | Description |
|---|---|
| Disc quantity range per unit | 30-100 pcs |
| Airflow per single disc diffuser | 2-8 m³/h |
| Configuration | Floor-resting spiral |
| Diffuser Type | Disc (EPDM, Silicone, PU) |
| Structure Material | Stainless Steel 304 / 316 |
| Installation Method | Crane-installed (drop-in) in live reactors |
| Maintenance | Fully retrievable |
| Retrofit Compatibility | Excellent |
Floating Circular Spiral Disc Diffuser
Designed for retrofit applications and operating reactors where flexibility and minimal downtime are critical, Mapal’s floating circular spiral aeration unit equipped with disc diffusers is suitable for a wide range of basin geometries. It delivers high oxygen transfer efficiency, uniform oxygen distribution, and effective mixing across the basin, supporting stable and efficient biological treatment performance.
Designed to maintain optimal diffuser submergence under variable water levels, it is particularly suitable for lagoons and basins where draining or civil works are not feasible, where the floor is uneven, or where access to the tank floor is restricted. Its relatively compact dimensions make it especially suitable for emergency and temporary aeration applications.
The unit incorporates a stabilising system of UV-resistant polypropylene floats and is secured in place to ensure stable operation. It is compatible with disc diffusers from any manufacturer.
The unit features a marine-grade stainless steel (304/316) structure, is crane-installed (drop-in), fully retrievable, and suitable for installation in live reactors without draining, minimising downtime and simplifying long-term maintenance.
Operational Flexibility
The floating unit can provide a complete aeration solution, operate over existing fixed-floor diffusers, work alongside surface aerators for supplemental oxygen, or replace malfunctioning equipment.
Technical Snapshot
| Parameter | Description |
|---|---|
| Disc quantity range per unit | 30-100 pcs |
| Airflow per single disc diffuser | 2-8 m³/h |
| Configuration | Floating |
| Diffuser Type | Disc (EPDM, Silicone, PU) |
| Structure Material | Stainless Steel 304 / 316 |
| Installation Method | Crane-installed (drop-in) in live reactors |
| Maintenance | Fully retrievable |
| Retrofit Compatibility | Excellent |
| Floating Configuration Feature | Incorporates a balancing system of UV-resistant polypropylene floats and is harnessed in place for stable operation. |
Where This Unit
Performs Best
Circular spiral aeration units are particularly well suited for:
Retrofit Projects Without Shutdown Windows
Drop-in installation enables deployment in live basins without draining, reducing risk and minimizing operational disruption.
Rapid Aeration Deployment
Its compact circular spiral configuration supports fast mobilisation for temporary and emergency aeration needs.
Aging Diffuser System Replacement
Replaces failing diffuser systems without requiring major civil modifications or extended outages.
Plants Operating Near Capacity Limits
Supports improved oxygen transfer efficiency and consistent process performance under high loading conditions.
Facilities Seeking Long-Term Reliability
Marine-grade stainless steel construction ensures durability and dependable long-term operation.
Engineered For Rapid Emergency Aeration Deployment
The circular spiral aeration unit is especially suitable for temporary and emergency aeration.
Typical Applications
Municipal Wastewater Treatment Plants
Industrial Wastewater Treatment
Retrofit Upgrades of Aging Aeration Systems
Why Mapal
Drop-In, Retrievable Solutions
No-Downtime Installation
Proven Global Installations
Municipal Wastewater Treatment Plants
Planning an Upgrade or Retrofit?
Let our engineering team evaluate your basin and recommend the optimal aeration configuration for your process requirements.