Coarse Bubble Diffusers

The Coarse bubble diffusers produce 1/4 to 1/2 inch bubbles which rise rapidly from the floor of a wastewater treatment plant or sewage treatment plant tank. They are typically used in air stripper chamber, grit chambers, equalization basins, chlorine contact tanks, and aerobic digesters, and sometimes also in aeration tanks. Coarse bubble diffusers typically provide half the mass transfer of oxygen as compared to fine bubble diffusers, given the same air volume.

ERE coarse bubble diffuser has the following features:

• High mixing capability through high energy cross-flow current generation from extended diffuser length (up to 2.5m. long per diffuser).
• Clog-free design.  
• Stainless Steel fabrication 304L or 316L.
• Leveling adjustment.

Oxygen transfer rates up to 0.5 to 0.8% per foot of submergence (1.7 to 2.5% SOTE/m).

APPLICATIONS

Activated Sludge Basins
Aerated Grit Chambers
Deep Aeration Basins
Aerobic Digesters
Sludge Storage Tanks
Basin Channels
Post Aeration Basins
VOC Stripping

INDUSTRIES

Pulp & Paper Mills
Food & Meat Processing
Municipal Wastewater
Treatment
Dairies
Breweries
Wineries
Groundwater
Remediation

FINE BUBBLES

Fine bubble diffusers produce a very small air bubbles which rise slowly from the floor of a wastewater treatment plant or sewage treatment plant aeration tank and provide substantial and efficient mass transfer of oxygen to the water. The oxygen, combined with the food source, sewage, allows the bacteria to produce enzymes which help break down the waste so that it can settle in the secondary clarifiers or be filtered by membranes.

The subject of bubble size is important because the aeration system in a wastewater or sewage treatment plant consumes 50 to 70% of the energy of the entire plant. Increasing the oxygen transfer efficiency decreases the power the plant requires to provide the same quality of effluent water. Furthermore, fine bubble diffusers evenly spread out on the floor of a tank provide the operator of the plant a great deal of operational flexibility. This allows for more precise targeting and removal of specific contaminants.

Fine bubble diffusers have largely replaced coarse bubble diffusers and mechanical aerators in most of the developed world and in much of the developing world.