Operating principle, construction and components, membrane and support plate design, technical parameters and selection notes for the flat-panel micro-pore plate aerator.
← Back to Plate AeratorA plate aerator, also called a flat plate diffuser or flat-panel membrane diffuser, is a fine-bubble aeration device used to supply oxygen to aerobic treatment tanks. It is one of three standard body shapes in a diffuser grid, alongside the disc diffuser and the tube diffuser, and it is the shape used where a long, flat band of bubbles is wanted instead of a ring or a line.
The unit consists of an elastic micro-pore membrane covering the flat face of a rigid support plate. The membrane is clamped down along the edges of the plate and the plate is held flat by a ribbed structure on its reverse. Air is fed to a single inlet at the centre of the plate, and the whole assembly is laid flat on the tank floor, arranged in rows or banks along the air main.
The design is characterised by a wide active membrane face, a low and shallow body, a rigid ribbed plate that resists bowing across its span, and a membrane that can be released and replaced on site without dismantling the rest of the grid.
Air from the distribution main enters the diffuser through the central inlet in the back of the plate and fills the space between the support plate and the membrane. The pressure lifts the elastic membrane away from the plate, the micro-pores in the membrane open, and the air is released into the water as fine bubbles over the face of the plate.
Because the membrane is elastic, the pores open only under air pressure and close again when the air supply stops: the membrane relaxes back onto the support plate and seals the pores against the water. This is the same self-closing principle used across elastic-membrane diffusers, and it prevents wastewater from flowing back into the air main and keeps the pores free of clogging while the blower is off.
The bubbles leaving a flat face rise in a broad, uninterrupted band rather than a narrow plume, so the diffuser oxygenates the tank and at the same time provides mixing over the area of the plate. Several plates set out in rows give a bubble pattern that can be matched to the plan of the basin.
The active membrane area is spread across a shallow plate. That keeps the diffuser low in the tank, which suits shallow basins, narrow channels and compact plants, and it means bubble release is distributed along bands of the tank floor rather than concentrated at individual points. The flat face also makes the plate easy to lay out on a grid and to align level on the tank floor.
A plate aerator is assembled from the following parts:
Air distribution piping, gaskets and mounting brackets are supplied to suit the air main design; the plate, membrane material and connection details are confirmed against the ordered model.
The membrane is the working part of the diffuser: an elastic sheet perforated with micro-pores that open under air pressure and close again when the air stops. Because it returns onto the flat plate when the blower is off, the membrane seals the pores against the tank contents and protects the air main from backflow. Membrane material, thickness and pore design for this product are stated on the quotation for the ordered model.
The support plate is a flat, elongated plate with rounded ends. Its reverse carries a ribbed skeleton — triangular framing members crossing the plate — which stiffens the plate so that it stays flat under the working air pressure and holds the membrane against a true surface. Keeping the plate flat matters twice over: it keeps the membrane uniformly supported so the pore opening is even across the face, and it keeps the plate stable on the tank floor without heavy anchoring.
The membrane is clamped by lugs bolted along both long edges of the plate at mid-length, so the bolted joint can be released on site and the membrane lifted for inspection or replacement. Air is supplied through a single central inlet hub on the back of the plate — one connection per unit — which keeps the branch piping for a grid of plates simple and reduces the number of joints below the water line.
| Parameter | Value |
|---|---|
| Diffuser type | Flat-plate (plate) fine-bubble membrane diffuser |
| Product form | Elongated flat plate with rounded ends; triangular reinforcing ribs on the reverse |
| Membrane | Elastic micro-pore membrane — material on request |
| Membrane thickness | On request |
| Support plate material | On request |
| Plate dimensions (L × W × thickness) | On request |
| Active membrane area per unit | On request |
| Air connection size & thread | On request |
| Airflow per unit | On request |
| Bubble diameter | On request |
| Oxygen utilisation | On request |
| Service area per unit | On request |
| Recommended water depth | On request |
| Service temperature | On request |
| Fasteners & clamps | Bolted clamp lugs along both long edges — grade on request |
| Mounting | Flat on the tank floor, arranged in rows or banks along the air main |
| Application | Municipal sewage and industrial wastewater aeration; aerobic tanks and aerated biofilters |
| MOQ / price | On request — confirm model, quantity & destination |
Plate aerators are built to suit the tank, so the dimensional and performance figures are confirmed in writing against the ordered model. Diffuser performance in service depends on tank depth, airflow rate, diffuser density and grid layout, so please confirm the final figures against your basin design before detailed engineering.
Plate aerators are used for aeration and oxygen supply in municipal domestic sewage and industrial wastewater treatment, where air is fed through a main and branch piping to a grid of diffusers laid on the tank floor.
Typical duties include aerobic tanks and aeration basins, activated sludge systems and aerated biofilters, together with the replacement or upgrading of existing aeration systems. The flat form suits shallow basins where there is little headroom above the floor, narrow channels and compact or packaged plants, and layouts where the bubbles need to be released in long bands across the basin rather than from isolated points on the floor.
Compiled from the standard construction of this flat-panel diffuser type. Confirm dimensions, membrane grade, connection size and airflow against the ordered model before detailed engineering.