Aerobic Treatment Unit

Excellent Aerobic Treatment Unit

Sit Back and Let the Bacteria Do Its Job

The staff at Creed Septic System Specialists can help you install an aerobic treatment unit. The bacteria are introduced into the system so that they can help break down or digest the effluent and treat them. The resulting end product is less toxic, can be sterilized, and can be used for surface irrigation. Call us now to learn more about the benefits of an aerobic treatment unit!


Aerobic treatment unit Aerobic treatment unit Aerobic treatment unit Aerobic treatment unit

Process Description


The Hydro-Action® AP Series individual wastewater treatment plant is a self-contained, extended aeration, aerobic treatment facility utilizing the activated sludge process. The plant is equipped with a cylindrically shaped aeration tank with an offset service access, a distinctive cone-shaped clarification slot and an outlet tee-assembly. It comes with two fine-bubble air diffuser assemblies with ceramic stone diffusers and Hydro-Action® efficient rotary air pump to provide effective, efficient, and economical aeration.


Wastewater from households enter the aeration compartment and is mixed thoroughly with the already present mixed liquor suspended solids (MLSS) activated sludge. Infusing air through the porous ceramic  air diffusers placed near the bottom of the aeration chamber is responsible for this complete mixing. The fine-bubble diffusers and the vortex area between diffuser assemblies combine to create a high magnitude of air diffusion and therein provide ample mixing and an ample quantity of dissolved oxygen to maintain the aerobic environment even under extreme conditions.


Hydraulic displacement causes the mixed liquor to enter the clarification compartment and move upward toward the outlet tee-assembly. Thanks to the calm conditions in the clarifier, suspended solids settle at the bottom where they are remixed with the Mixed Liquor Suspended Solids (MLSS) for additional biological treatment. The remaining clarified effluent leaves the plant via the outlet tee assembly and discharge line.


The AP Series ATUs are operated by the OPS®. The OPS® integrates the electrical controls, visible and audible alarms, and air pump in a protective polyethylene enclosure. The OPS® can be either platform mounted on the plant or remotely located. These features plus; the offset access, flexible air hose, and anchored diffuser assemblies make the plant extremely reliable and easy to service. An optional visible and audible alarm may be added to remotely locate to an area of your choice.


The mechanics used in the Hydro-Action® plant allow it to produce excellent effluent quality, which thereby meets all ANSI\NSF International Standard 40 class I and the Environmental Protection Agency’s requirements of a secondary treatment process. NSF warrants that a Class I plant shall be shown to meet EPA secondary treatment guidelines for CBOD5, TSS, and pH. The Hydro-Action® AP Series ATUs satisfy these criteria.

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