Grid Aeration Units
Grid aeration units deliver uniform air distribution, stable mixing, and reliable oxygen transfer across rectangular basins. Available in stationary (floor-sitting) and floating configurations with tubular or disc diffusers, the modular stainless-steel (304/316) design supports drop-in deployment without draining.
Available Configurations
Stationary Grid Tubular Diffuser
Mapal’s floor-resting grid aeration unit with tubular diffusers provides uniform air distribution and reliable mixing. These units are ideal for rectangular basins requiring robust design and consistent oxygen transfer.
Mapal’s grid aeration units equipped with tubular diffusers, have marine-grade stainless steel (304/316) inner tubes and fine-bubble tubular sleeves (EPDM, silicone, PU).
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 |
|---|---|
| Diffuser length range | 500-2500 mm |
| Airflow per 1 m tubular diffuser | 4-12 m³/h |
| Configuration | Floor-resting grid |
| 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 Grid Tubular Diffuser
Mapal’s floating grid aeration unit with tubular diffusers is designed to maintain optimal diffuser submergence under variable water levels, ensuring stable and efficient oxygen transfer. 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.
The tubular diffusers incorporate marine-grade stainless steel (304/316) inner tubes fitted with fine-bubble sleeves in EPDM, silicone, or PU. A stabilising system of UV-resistant polypropylene floats supports the unit, which is harnessed in place to ensure reliable operation under varying conditions.
The overall structure is manufactured from marine-grade stainless steel (304/316) for durability and long service life. The unit 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 | 500-2500 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 Grid Disc Diffuser
Mapal’s floor-resting grid aeration unit with disc diffusers provides uniform air distribution and reliable mixing. These units are ideal for rectangular basins requiring robust design and consistent oxygen transfer.
Mapal’s grid aeration units 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 | 8-500 pcs |
| Airflow per single disc diffuser | 2-8 m³/h |
| Configuration | Floor-resting grid |
| 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 Grid Disc Diffuser
Mapal’s floating grid aeration unit with disc diffuser is designed to maintain optimal diffuser submergence under variable water levels, ensuring stable and efficient oxygen transfer. The system is particularly suitable for lagoons and basins where draining or civil works are not feasible, where the floor is uneven, or where there is restricted access to the tank floor.
Mapal’s grid aeration units with disc diffusers are compatible with disc diffusers from any manufacturer.
The floating aeration units incorporate a balancing system of UV-resistant polypropylene floats and are harnessed in place for stable operation.
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 |
|---|---|
| Disc quantity range per unit | 8-500 pcs |
| Airflow per single disc diffuser | 2-8m³/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
Grid 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.
Tailored to Basin Geometry
The grid configuration can be adapted to suit a wide range of basin geometries, including rectangular and circular basins, by adjusting diffuser length and layout to project-specific requirements.
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 Custom Layouts And Tight Dimensions
Mapal’s grid aeration units can be tailored to suit site-specific dimensions and challenging installation conditions while maintaining reliable aeration performance. This project demonstrates how the standard grid concept can be adapted to meet tight spatial constraints and special layout requirements.
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.