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Wastewater Aeration

All wastewater treatment systems have one thing in common…they need oxygen, and LOTS of it. The good news is that there has been a breakthrough in aeration technology resulting in an affordable, highly effective aerator. The name is VaraCorp's Aeration System and it holds the promise of being the most efficient aerator on the market.

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Does your waste treatment system need a boost in performance? Do you need low-cost help in meeting regulatory requirements for wastewater discharge? Do you need an affordable back-up system to keep your operations underway when your main facility is down for repair?

The Turbine Technology is your answer. It generates an unbelievable barrage of entrained oxygen molecules and then injects them into your treatment stream or lagoon. The unit is quiet, light weight, and virtually maintenance free. Plus, it can be moved from place to place as needed within your treatment system.

The Turbine Technology can be operated with a motor as small as 1 ½ horsepower, yet its performance can match that of a much larger aeration device. No longer do you have to strain your operating budget just to pay the electric bill.

There are many different types of wastewater treatment systems in use today. One of the most common is an aerated lagoon. Here, artificial aeration is used to inject air (oxygen) into the wastewater to biotreat the pollutants. Along with oxygen and organic matter (pollutants) all treatment systems need microbes to complete the digestion process. Microbes can either be air-breathing (aerobes) or non-air-breathing (anaerobes.) Aerobes tend be more highly efficient and produce lower odors as compared to anaerobes. Fortunately, many of the beneficial aerobes are ubiquitous in Nature and are pulled into the wastewater along with the injected air. The benefit of injecting air beneath the surface is to allow aerobes to live and process waste directly in the water.

Aerators fall into several different categories as follows:

Floating Surface Aerators

Submerged Aerators

Fixed-in-Place Surface Aerators

Compressed Air Diffusers

Turbine Technology is a hybrid aerator in that it can float on the surface or else be attached to a wall. Regardless of how it is installed, it always releases air beneath the surface of the water. Using a rotating disc that operates on the principle of precession, it discharges a plume of oxygenated water in both a downward and a 360-degree lateral direction. Compared to other subsurface aerators, the Turbine produces very little surface frothing. The reason is that the particle size of the entrained air is sufficiently small that a greater percentage of the air (oxygen) is held in suspension beneath the surface. The suspension of such small particle sizes of oxygen is critical to the efficiency of any treatment system because it permits a more rapid explosion in the subsurface growth if aerobic microbes.

In a clear water demonstration of turbine it appears that a white cloud is forming beneath the water. This visual image is a testimony to the high percentage of small oxygen bubbles being created and held in suspension.

Besides aeration lagoons, many small municipalities use stabilization ponds to treat municipal wastes. These lagoons are shallow, man-made basins from 30 inches to five feet deep. Usually, they comprise two or more basins in series where the wastewater flows via gravity from one basin to the next. The main treatment takes place in the first basin which acts as an anaerobic pond in which suspended solids drop to the bottom.

While stabilization ponds are inexpensive to build and are low-tech, they sometimes become non-compliant with regulatory authorities during the cooler months of the year. While specific causes might be at work, the general cause is that the intensity of sunlight and the lagoon water temperature are not at their peak in cooler months.

In prior economic times State environmental regulators were reluctant to impose fines on small, non-compliant municipalities, preferring instead to work patiently with them. However, with ongoing budget cuts at the State level, it is likely that more and more regulators will now impose fines as a means to raise revenue for their own operations.

When a municipality finds itself facing a fine, a dilemma arises. Severe budget shortfalls preclude upgrading the treatment basin to a high-tech operation. What these smaller municipalities need is a means for boosting the treatment process, particularly in the cooler months. The Turbine Turbine provides an affordable way to increase treatment efficiency without violating or in any way changing the permit rules under which the system is licensed. In many cases the cost of installing a Turbine is less than the imposed regulatory fine. Once the regulators see the near-immediate improvement in the treatment process, the fines are apt to go away.

Turbine Technology is a self-aspirating aerator. This means that it draws air by suction from the atmosphere. It does not need high-dollar canister oxygen or a compressed air system to generate and inject oxygen into the body of water. Also, due to its design, it is virtually impossible for the turbine to clog.

Turbine Technology can be installed in many different locations within a treatment system. For example, it can be placed in the last basin of a stabilization system for final treatment before the wastewater is discharged into the environment. In the alternative, it can be placed in the first basin to jump-start the aeration process. A sufficient number of Turbine can actually help aerobes attack and dissolve the solids which have dropped to the bottom of the first basin. Such action can prolong or hopefully eliminate the need for dredging the basin.

The Turbine also works well in systems where sewage is treated close to where it is created. An example would be an onsite package plant. Other examples include large septic tanks and biofilters.

Turbine Technology is particularly cost effective in tertiary treatment systems where water is to be discharged into environmentally sensitive eco-systems. Such treated water is sometimes disinfected chemically prior to release into a stream or into a groundwater recharge zone for agriculture purposes. Due to its unique design, the Turbine Turbine can be fitted with a special intake port which is activated by the naturally occurring vacuum. Connected to this port can be a time-release container of whatever chemical or additive is needed. The additive will be picked up by the vacuum and discharged into the body of water along with the atmospheric air.

Each turbine is operated by a low horsepower electric motor. The power requirements of the motor can be sized to meet the electrical requirements of your treatment system, from 220 volts and up.

For related information click on following links on this website.

Call us with your questions on pond aeration.

(For more information on pond construction and management contact your local county extension agent, aquaculture agent, or regional fisheries biologist.)