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Biological wastewater treatment processes were actually developed by observing nature. As waste entered the stream,
the dissolved oxygen content in the water decreased and bacteria populations increased. As the waste moved
downstream, the bacteria would eventually consume all of the organic material. Bacterial populations would
then decrease, the dissolved oxygen in the stream would be replenished, and the whole process would be repeated
at the next wastewater discharge point.
The package wastewater treatment system utilizes a multi-step treatment process to achieve the desired
final discharge requirements. The treatment steps can consist of comminution, screening, diffused aeration,
clarification, sludge recirculation, sludge digestion, disinfection, and filtration.
Pre-engineered modular components such as diffused air blowers, aeration tanks, sludge holding tanks,
clarifiers, and disinfection units allow for the wastewater treatment package plants to be sized specifically for the customer's
application. They can be designed to handle a variety of influent flow rates and BOD loadings, as well
as meet a myriad of mandated discharge parameters.
EFFICIENT MULTI-STEP TREATMENT PROCESS
The influent wastewater enters the package plant by passing through a comminutor and/or bar screen
for gross solids removal. This step provides for the mechanical reduction of solids prior to aeration.
Once the wastewater has entered the aeration chamber, the untreated flow is mixed with an active
biomass in a rolling action that takes place the length and width of the chamber in a slow forward
progression. This rolling mixing action is the result of air originating from diffusers located
along one side of the bottom of the tank. This insures that adequate mixing is maintained in the
tank. The chambers are filleted on each side along the bottom to assure and enhance the rolling
motion of the water and to eliminate any "dead zones" in the tank. The oxygen transfer achieved
with the diffused air passing through the wastewater coupled with the rolling action provides a
sufficient oxygen supply allowing microorganisms to oxidize treatable wastes into carbon dioxide,
water, and a stable sludge.
After aeration, the wastewater flows to the clarifier that typically has a hopper bottom
configuration. The clarifiers are sized to provide the required retention time based on an average
twenty-four hour design flow. During the settling period, solids settle on the bottom of the clarifier.
Airlift pumps with adjustable pumping capabilities are used to return these solids, as activated sludge,
to the aeration chamber to maintain the maximum efficiency of the biological process. When necessary,
excess sludge is wasted to an aerated sludge digestion tank for additional treatment and reduction.
A skimmer airlift pump is used to return floatable solids and scum to the aeration chamber for further
processing.
The treated water flows from the clarifier to a disinfection chamber for treatment prior to discharge
to complete the treatment process. Tertiary filtration may also be used where a higher quality of
effluent is required.
ADVANTAGES
- Pre-engineered, pre-fabricated structures result in lower cost
- Unit is easily transported to the customer's project site
- Design allows for a quick turn around time for delivery and installation
- System is simple to operate and requires low manpower
- Effective aerobic operational principal
- User friendly - low and easy maintenance
- Regulatory compliant
- Custom design / application specific systems
- Long service life
TYPICAL APPLICATIONS
- Land development / housing / subdivisions
- Small and medium sized cities
- Mobile home parks
- Remote mining, logging, and construction sites
- Recreational areas such as parks and marinas
- Low Flow / High Strength and High Flow / Low Strength application
- Biological treatment for industrial wastewater flows
- Manufacturing facilities, power plants, military bases
- Schools and other educational campuses
FOR OPERATIONAL INFORMATION
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513.831.1165
CIRCULAR MECHANICAL
