Why Wastewater Aeration Is Important For Wastewater Treatment

The wastewater aeration process uses oxygen to help bacteria stabilize and treat the water.

What is Wastewater Aeration?

Wastewater aeration is the process where air is circulated through, mixed with or dissolved in a liquid or substance. Aeration brings water and air into contact in order to remove dissolved gases, such as carbon dioxide and hydrogen sulfide, and to oxidize dissolved metals, including iron and volatile organic compounds (VOCs).

Wastewater aeration, in which air is mixed with wastewater to allow aerobic degradation of the pollutant components, is an integral part of most biological wastewater treatment systems.

This process is typically the first major process at drinking water treatment plants, and occurs in the secondary treatment processes of activated sludge treatment in wastewater treatment plants. An evenly distributed oxygen supply in an aeration system is essential to effective wastewater treatment for fostering microbial growth.

Wastewater Aeration – When it is used

In municipal and industrial wastewater treatment, wastewater aeration is part of the secondary treatment process. The activated sludge process is the most common option in secondary treatment.

Wastewater Aeration in an activated sludge process is based on pumping air into a lagoon or lake, which promotes the microbial growth in the wastewater. The microbes feed on the organic material, forming flocks which can easily settle out. After settling bacteria forming the “activated sludge” flocks are continually recirculated back to the aeration basin to increase the rate of decomposition.

Why is Aeration important for Wastewater Treatment?

Wastewater aeration is one of the most critical components in a treatment system. A well-designed wastewater aeration system that distributes oxygen evenly is a critical component of activated sludge treatment systems. An ample supply of oxygen in an aeration system is important for achieving rapid, economically viable and effective wastewater treatment.

Wastewater Aeration is important because it’s highly effective, economically viable, and great for the environment compared to other options.

Through proper maintenance and a proactive approach, waste facilities can reliably protect the environment and provide a practical solution for both small towns and large cities.

The benefits of Wastewater Aeration treatment:

The main benefit of the aeration is that it uses natural microorganisms from the water to remove pollutants. The chemicals used in other treatment systems can be harmful when used in high volumes, but the aeration process uses microorganisms naturally found in wastewater.

Wastewater Aeration Equipment

There are numerous kinds of wastewater and water aerators. The most common are surface aerators, which as the name implies, float on the surface of the lagoon, pond or basin they are aerating.

These could be:-

  • fast or slow speed “splashers”,
  • draft tube [propeller],
  • or rotating brush [or paddle] types

There are also submersible lagoon aerators. These could be:-

  • Submersible pumps with a draft tube
  • Submersible pumps with a draft tube an ejector

What is common to both these kinds of systems, is that they cannot be easily accessed by operators for maintenance or repair. They need to be accessed by lifting devices [cranes etc], tether systems or by personnel rowing to them or using expensive infrastructure. This adds to overall maintenance costs, reduces the willingness to perform maintenance [increasing the potential for major breakdowns] and increases WHS risks.

An alternative to these systems is the EchoStorm venturi water aeration system from Gorman-Rupp. This system utilises a self-priming pump [mounted on the bank of the lagoon] to draw water from the lagoon. It then pumps that water at pressure through the EchoStorm unit. The EchoStorm water aerator uses an internal nozzle to accelerate the water to create a low pressure area within the unit to draw in atmospheric air. It then mixes the air with the water and releases it [saturated with dissolved oxygen] back into the lagoon. Further advantages of this system include:-

  • Dead-spot minimisation by being able to “aim” the discharge points to benefit mixing
  • Quick, easy and safe maintenance
  • Lower installation costs [only requiring a slab to mount the pump]
  • Easy to scale by adding EchoStorm units to existing systems

Ready to build the perfect wastewater aeration pump system for your project? We’re standing by to help.

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Wastewater Aeration Pumps

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The Gorman-Rupp Super U Series self priming dewatering and grey water pumps combines the best features of quality trash pumps in Australia with increased fuel efficiency and higher heads to pump through smaller and/or longer discharge piping systems or overcome the losses in filter systems.

These centrifugal pumps have been designed for economical, heavy duty (24/7) trouble-free operation.

Advantages include:

  • Ability to mount high and dry above the water (not in it)(to 7.6m)
  • Low cost of ownership
  • Greatly reduced OH&S issues
  • Easy access for monitoring or service
  • Advanced safety features to protect operators
  • Improved maintenance features to greatly reduce maintenance time and costs, with removable rotating assembly
  • A variety of materials of construction to handle abrasive and/or corrosive fluids
  • Any engine brand required by the customer
  • Choice of skid or trailer mounted configuration

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The Gorman-Rupp Super T Series self-priming centrifugal wastewater/sewage pump has been the world benchmark for this technology since 1963 (>50 years). They have been designed for economical, trouble-free operation, with superior solids handling capability and a large inspection cover to access pump internals for service or blockage removal.

Advantages include:

  • Self-Priming pump has the ability to mount high and dry above the wet well (not in it)
  • Low cost of ownership
  • Greatly reduced OH&S issues – no more working over water/heights/cranes/heavy swinging weights
  • Surface-mounted pumps with easy access for monitoring or service
  • Advanced safety features including pressure relief valve to protect operators
  • Improved maintenance features to greatly reduce maintenance time and costs, with removable rotating assembly
  • A variety of materials of construction to handle abrasive and/or corrosive fluids

The Gorman-Rupp Super T Series sewage and wastewater pumps with Eradicator™ Solids Management System are a series of self-priming centrifugal pumps designed specifically for handling municipal and industrial wastewater containing stringy, difficult to pump, solids in suspension (such as wet wipes, rags and feathers).

They have been designed for economical, trouble-free operation, with design features that deliver superior solids handling capability and a large inspection cover to access pump internals for service or blockage removal. Gorman-Rupp Super T Series wastewater and sewage pumps have been used for pumping of WAS and RAS and for digester recirculation with great success in wastewater treatment plants around the country, as well as food process plants, paper mills and other heavy industries. The Eradicator™ system advances the solids handling capabilities of this range.

Advantages include:

  • Ability to mount high and dry above the wet well [not in it]
  • Low cost of ownership
  • Greatly reduced OH&S issues
  • Easy access for monitoring or service
  • Advanced safety features to protect operators
  • Improved maintenance features to greatly reduce maintenance time and costs, with removable rotating assembly
  • A variety of materials of construction to handle abrasive and/or corrosive fluids

The EchoStorm water aerator from Gorman-Rupp offers the benefits of safety, reliability and ease of access to water aeration applications.

Because these units are mounted on the bank [instead of floating on the water or being submerged in it], access is much less complicated and safer, while delivering oxygen transfer outcomes.

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The EchoStorm water aerator benefits::

  • No cranes or row boats for maintenance
  • Easily accessed
  • Less downtime
  • Reliable and easy to maintain
  • Easily scalable and low cost of ownership
  • Thorough mixing – no dead spots
  • High SOTR (Standard Oxygen Transfer rate)
  • Oxygenated water

These aeration units are used in conjunction with Gorman Rupp self-priming centrifugal pumps to deliver solutions for the following applications:

  • Lagoon and basin water aerator
  • Oxidation ditch aeration
  • Lake destratification and algae control
  • Odour control
  • Sludge digestion
  • Septage treatment

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Over 88 years

Of Team Experience in Pumping and Aeration systems.

We bring you the technical knowledge & experience

Hydro Innovations are proud to distribute a broad range of quality, reliable industrial pumps and aerators for Australian Industry.

Gorman-Rupp is the world leader in self-priming centrifugal wastewater pump technology, Ragazzini manufacture quality Italian peristaltic pumps, EDUR are world leaders in DAF pump technology, Venturi Aerators for simple bank mounted aeration, and Lamella pumps for abattoir bone and offal.

Holding a very large inventory of pumps and spare parts allows us to deliver industry-leading service. With over 88 years combined experience in applying, selecting and troubleshooting pumps, we are also in a good position to help design the best and most cost-effective fluid transfer systems for our customers.

Ready to build the perfect pump system for your project? We’re standing by to help.

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