A tube aerator (tube diffuser) supplies oxygen to municipal sewage and organic industrial wastewater treatment systems. Air from the distribution main enters the support tube and passes through its pores; the pressure expands the rubber membrane so the micro-pores open and the air is released into the water as a uniform curtain of fine bubbles. When the air supply is interrupted the membrane immediately returns to its original shape and the pores close — a self-closing design that prevents backflow and clogging.
Key features
- Simple structure, high oxygen utilisation and reliable performance.
- Small bubble diameter: efficient oxygen transfer combined with mixing of the tank contents.
- No backflow when the blower stops; the self-closing pores do not block.
- Even loading around the circumference of the tube, for a long service life.
- Quick installation and removal on the air main; low system cost.
Materials. The rubber membrane is EPDM (ethylene propylene diene monomer), with good heat, ozone and acid-alkali resistance, no plasticiser, and elasticity that is retained over time without hardening, embrittling or ageing. The support tube and the air distribution piping are ABS or PVC engineering plastic; the air pipe is supplied in a hollow, water-filled form that greatly reduces the buoyancy of the aeration system in the tank. The clamps are 304 stainless steel.
Membrane details. The membrane is perforated with 1.5 mm pores on a 2 × 2.5 mm pitch, producing uniform bubbles 1–3 mm in diameter, and the top of the membrane tube carries a 15 mm unperforated zone.
