Aeration System · Plate Diffuser
Plate Aeration Diffuser
Fine Bubble Plate Aeration Diffuser Manufacturer & Supplier
AquaSust AS-PD series plate aeration diffusers are high-efficiency aeration components engineered for high-standard municipal and industrial wastewater treatment, including power plant wastewater and seawater desulfurization duty.
The AS-PD650 is the standard model for conventional aeration tanks and small-to-medium scale renovation projects. The AS-PD650-Pro places the same 650 mm platform on a PP + glass fiber base plate and frame. The AS-PD1100-Pro is a special large-format model with a 0.2 m² effective membrane area — wider coverage per unit, aimed at energy-saving renovation of large-scale sewage treatment plants.
AS-PD series plate diffusers — uniform membrane surface, uniform bubble release.
Two platforms, three models
The AS-PD series runs on two physical platforms — the 650 mm plate and the 1180 mm large-format plate. Each is available with the base plate and frame construction that fits the specification of your aeration tank and the local procurement standard.
EPDM membrane · ABS base plate & frame
Best for: conventional aeration tanks and small-to-medium scale renovation or retrofit projects.
EPDM membrane · PP + Glass Fiber base plate & frame
Best for: projects that specify a PP + glass fiber base plate and frame on the 650 mm platform.
Same-size series figures; final configuration subject to project confirmation.
EPDM or TPU membrane · PP + Glass Fiber base plate & frame · EPDM gaskets
Best for: energy-saving renovation of large-scale sewage treatment plants, and retrofit onto existing stainless steel or plastic pipes, round or rectangular, of different diameters.
Technical data
AS-PD650 and AS-PD1100-Pro figures are quoted from the AquaSust AS-PD series plate diffuser product manual. The AS-PD650-Pro model designation and its PP + glass fiber base plate and frame construction are supplied per the project requirement; its remaining values are the AS-PD650 series reference figures for the same 650 mm platform. Unit: mm unless stated otherwise.
Scroll the table horizontally to compare all three models.
| Parameter | AS-PD650 | AS-PD650-Pro | AS-PD1100-Pro |
|---|---|---|---|
| Platform | 650 mm plate | 650 mm plate | Large-format plate |
| Aeration mode | Fine pore / fine bubble | Fine pore / fine bubble | Fine pore / fine bubble |
| Overall dimensions (L × W) | 680 × 220 mm | 680 × 220 mm | 1180 × 270 mm |
| Membrane material | EPDM | EPDM | EPDM / TPU |
| Membrane thickness | 1.8–2.0 mm | 1.8–2.0 mm | 1.9–2.1 mm |
| Nominal bubble diameter | 0.8–1.9 mm | 0.8–1.9 mm | 0.8–2.0 mm |
| Standard design airflow | 6 m³/h | 6 m³/h | 10 m³/h |
| Operating airflow range | 1–16 m³/h | 1–16 m³/h | 1–20 m³/h |
| Pressure loss (head loss) | 2.0–4.3 kPa | 2.0–4.3 kPa | 2.0–4.5 kPa |
| Design coverage area per diffuser (reference) | 0.5–2.5 m² | 0.5–2.5 m² | 1.0–5.0 m² |
| Base plate material | ABS | PP + Glass Fiber | PP + Glass Fiber |
| Frame material | ABS | PP + Glass Fiber | PP + Glass Fiber |
Engineering principle
The two diffuser families differ in how the membrane surface is arranged. In a tube diffuser the effective surface follows an arc, so the membrane sits at different elevations along the tube and the released air is not distributed from a single level. In a plate diffuser the membrane is flat, so the entire effective surface lies at one hydraulic level inside the tank.
What that flat arrangement changes is the airflow distribution across the diffuser area. The AS-PD plate geometry is designed so the membrane releases air across its whole area rather than concentrating release in one part of the diffuser, which produces the even “lotus effect” bubble pattern the plate platform is specified for.
Across the published operating airflow range the unit is designed to run in both continuous and intermittent aeration modes, so one model can be applied to different biological process configurations. Oxygen transfer and mixing performance in a given tank are established through aeration system design — tank geometry, submergence, airflow and oxygen demand — and not by the diffuser selection alone.
Flat membrane layout: every point of the diffuser’s effective surface sits at the same hydraulic level.
What we do not claim
Energy savings depend on tank geometry, submergence depth, blower selection, control strategy and loading. We publish measured performance for a specific project only after it is verified for that project — we do not state generic percentage savings or a fixed service life.
Where it is used
The AS-PD series is specified for high-standard municipal and industrial wastewater treatment duty, including power plant wastewater and seawater desulfurization, and for retrofit work on existing aeration tanks.
The AS-PD1100-Pro is designed for retrofitting onto existing stainless steel and plastic pipes — round or rectangular, of different diameters — using a factory-welded clamp saddle. That makes it practical for capacity upgrades and energy-saving renovation where the existing air distribution pipework is retained.
AquaSust provides aeration system design as a service, so diffuser selection is not delivered in isolation. Layout arrangement, air distribution and pipework, and blower matching can be reviewed together with the diffuser count and coverage area figures in the table above.
Installation & handling
Exploded view: clamp saddle, gasket, wedge rail, locking wedge and safety pin.
FAQ
The two types differ in how the membrane surface is arranged. A tube diffuser follows an arc, so the membrane sits at different elevations along the unit and the released air is not distributed from a single level. A plate diffuser carries a flat membrane, so its entire effective surface lies at one hydraulic level — which is what allows the AS-PD plate geometry to release air across the whole membrane area and produce the even lotus-effect bubble pattern. Oxygen transfer performance in a given tank is established by aeration system design, not by the diffuser type alone.
AS-PD650 is the standard model with an ABS base plate and frame, intended for conventional aeration tanks and small-to-medium scale renovation projects. AS-PD650-Pro carries the project-specified PP + glass fiber base plate and frame on the same 650 mm platform; its remaining values are AS-PD650 series reference figures, with the final configuration subject to project confirmation. AS-PD1100-Pro is the special large-format model with a 0.2 m² effective membrane area and a 1.0–5.0 m² design coverage area per diffuser (reference value) — the preferred choice for energy-saving renovation of large-scale sewage treatment plants.
The AS-PD650 and AS-PD650-Pro are supplied with an EPDM membrane, 1.8–2.0 mm thick. The AS-PD1100-Pro is available with either an EPDM or a TPU membrane, 1.9–2.1 mm thick, and uses EPDM sealing gaskets between the diffuser and the air distribution pipe.
The AS-PD650 and AS-PD650-Pro have a standard design airflow of 6 m³/h with an operating airflow range of 1–16 m³/h. The AS-PD1100-Pro has a standard design airflow of 10 m³/h with an operating airflow range of 1–20 m³/h. Pressure loss is published as a range only: 2.0–4.3 kPa on the 650 platform and 2.0–4.5 kPa on the AS-PD1100-Pro. The manual does not state the test conditions behind those figures, so they are not a guaranteed value for a specific duty point.
A clamp saddle is welded to the diffuser in the factory. Drill an Ø25 mm bore hole in a central position on top of the round pipe, insert the Ø19 mm supply air connection from above, fit the EPDM gasket between the saddle and the pipe, then close the saddle with the locking wedge and secure it with the safety pin (standard) or one hexagonal head screw. The diffuser must end up firmly and horizontally assembled.
Store diffusers in their packaging in a dry, ventilated room. Before installing, confirm the pipelines are clean and remove all drilling chips and dirt — if debris is left in the pipework it will be carried into the diffuser once the blower starts. The gasket between the diffuser and the pipe must be clean and undamaged, and the safety pin must be fully clicked into place.
The published design coverage area per diffuser — 0.5–2.5 m² on the 650 platform and 1.0–5.0 m² on AS-PD1100-Pro — is a reference range, not a fixed figure. The area a single diffuser can serve depends on the geometry of the tank, the water depth, the airflow supplied to it and the oxygen demand of the process being treated. Those four inputs are what aeration system design uses to fix the diffuser count and layout, so treat the table values as a starting point for sizing rather than a specification to be applied directly.
Yes. The AS-PD1100-Pro is suitable for retrofitting onto existing stainless steel and plastic pipes — round pipe or rectangular, of different diameters — using the factory-welded clamp saddle. For high-standard duty the series is also specified for power plant wastewater and seawater desulfurization applications, and AquaSust documents projects in severe cold-climate zones within the AS-PD product manual.
Send us your tank dimensions, water depth, target airflow and treatment process. We will recommend the right model, quantity and layout — and confirm the final configuration for your project before ordering.
Hangzhou Aquasust Water Technology Co., Ltd · Aeration System & MBBR Media Manufacturer
With 20 years of wastewater treatment experience, AquaSust is the trusted expert in biochemical pool solutions. If you have any questions about wastewater treatment, please contact us and we will provide you with the best solution.
