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Types of Fine Bubble Diffusers

2. Tube Diffusers

In the early tube diffuser, Saran wound or made from aluminum oxide. Recently, the new design is perforated membranes and nonrigid (rubber-HDPE) porous plastic.

Configuration
The holder for the ceramic or rigid porous plastic media consist of two end caps held together by a connecting rod through the center. The rod is threaded into the feed end of the holder, the media and outer end cap installed, and a hex nut placed on the threaded rod to secure the assembly. The internal support frame is made from plastic. The membrane is usually not perforated at the air inlet point so when the air is turned of, the liquid head collapses the membrane against the support frame. An internal flap prevents backflow into the piping system.
For the nonrigid porous plastic diffuser, the support frame is made of stainless steel or fiberglass reinforced plastic. A check valve built in for preventing liquid backflow into air piping.

Installation
How to install tube diffuser? The 3/4 inch NPT is for attachment to air piping system. The depth of tube submergence in the basin is within 30 cm of bottom.
Tube diffusers are often installed down the center or along one or both long sides of the aeration tank.( Mid-width, single and dual spiral roll pattern). Usually above methods can offer better mixing for whole the tank than total floor coverage or cross roll pattern.

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