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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 consists of a cylindrically
shaped aeration tank with an offset service
access, a unique cone shaped clarification
compartment, and an outlet tee-assembly.
Two fine-bubble air diffuser assemblies with
ceramic stone diffusers and Hydro-Action® s’
efficient air pump are combined to provide
effective, efficient, and economical aeration.
Domestic wastewater enters the aeration
compartment and is mixed thoroughly with the
already present mixed liquor suspended
solids (MLSS) activated sludge. The injection
of air through the porous teflon air diffusers
placed near the bottom of the aeration
chamber is responsible for this complete
mixing. The fine bubble air diffusers and the
vortex area between diffuser assemblies
produce a generous quantity of dissolved
oxygen and ample mixing that maintain a
desirable 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. Due to the calm conditions in the
clarifier, suspended solids settle to the bottom
where they are remixed with the 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, air hose, and teflon
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 technology used in the Hydro-Action®
plant allows 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 requires 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 all these requirements.
Operating Instructions
Your Hydro-Action®ATU has been designed
and built to provide efficient, dependable and
reliable service. However, as with any
individual wastewater treatment plant, routine
periodic service is required. When proper
preventive maintenance is performed, the
ATU will operate at designed performance
levels giving years of satisfactory treatment of
domestic wastewater.
The local dealer from whom you purchased
your Hydro-Action®plant will perform all
routine inspections for the first two (2) years
from the original date of installation. At the
time of inspection the plant will be checked for
proper operation. If a problem exists, service
will be performed at no charge to the owner if
the required maintenance is warranty related.
At the end of the two (2) year initial service
period, your local dealer will make available a
continuing service policy. This extended
service is available for a nominal fee.
The Hydro-Action®ATU’s electrical controls
are located within the OPS®of the plant. The
OPS®may be either remotely located or
platform mounted. The OPS®enclosure is
equipped with an alarm beacon and an
audible alarm. Also on the enclosure will be
the name, address and telephone number of
your local servicing dealer. It is this local
service provider you should contact regarding
any problems with your Hydro-Action®ATU.
An optional remote alarm with audible and
visible alarms may also be present. If the
alarm beacon or audible alarm sounds simply
switch the OPS®switch to silent and call the
service provider mentioned above. After a
power failure, if an alarm remains on for more
than 30 minutes you should call the local
dealer immediately.