Diffuser assembly with buoyancy vessel
A diffuser assembly with a buoyancy vessel and a chamber for buoyantly raising the diffuser assembly for maintenance work. The diffuser assembly has a support structure, diffusers connected to the frame, and a buoyancy vessel positioned on the frame, capable of alternating between a state of buoyancy or ballast.
1. A diffuser module for use in aerating wastewater, said diffuser module comprising:
a support structure;
a diffuser assembly mounted to the support structure and having, a plurality of diffusers for applying air to the wastewater;
at least one buoyancy vessel mounted to the support structure and having a flotation chamber, said vessel being positioned such that a portion of the chamber is positioned above a center of mass of the support structure and diffuser assembly; and
a flow control opening in flow communication with the chamber and operable to selectively seal the chamber from gas discharge and selectively permit discharge of liquid from the chamber when gas is applied thereto.
2. The module of claim 1 , wherein said chamber includes spaced apart sides extending generally along opposite sides of said diffuser assembly.
3. The module of claim 2 , including a depending leg extending generally downwardly from said chamber and presenting said flow control opening at a location below the chamber.
4. The module of claim 3 , wherein said leg forms part of an elbow member on said vessel.
5. The module of claim 2 , wherein said chamber sides are on opposite sides of a center of mass of the module.
6. A diffuser module as set forth in claim 1 , wherein said buoyancy vessel comprises a pair of fluid chambers separate from one another.
7. A diffuser module as set forth in claim 1 , wherein said at least one buoyancy vessel comprises a single vessel.