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Aswaflow Treatment System

One of the most reliable sewage treatment systems on the market is the Sequential Batch Reactor (SBR) type system. As the name suggests, the sewage is treated in batches, not as one continuous flow.
When compared to some other systems on the Irish market, it could save the user hundreds of euro per year and potentially thousands over its lifetime in electricity costs alone.

The system is made up of two chambers within a tank. The first chamber stores the wastewater and also provides primary treatment in the form of settlement of heavy solids. The second chamber houses the treatment equipment made up of two pumps and a mechanical aerator.

The treatment of the wastewater is completed in an 8 hour cycle. At the beginning of the cycle a batch of wastewater is drawn across to fill the treatment chamber. Once the chamber has been filled, the 6 hour treatment phase begins. The aerobic bacteria which breaks down the organic waste thrives in oxygen, so in order to increase the efficiency of the system, oxygen is added to the wastewater by a mechanical aerator. The aerator mixes the wastewater with an impeller and introduces water through an air intake hose. This increases the dissolved oxygen level. Aeration is an intermittent process tailored specifically for each household situation. This ensures both optimum treatment and reduced power consumption.

At the end of the treatment phase, clarification occurs by leaving the treated wastewater undisturbed for 2 hours. This allows suspended solids to settle to the chamber floor, preventing them from being discharged. After clarification, the treated and clarified wastewater is pumped out into a suitable percolation area.




Lower Power Consumption

Single Tank

Precast Concrete System

Discreet – flush with ground level

Available in Pump or Gravity

We Deliver & Install

Fully Commissioned


Certified to EN Standards



Corcoran Precast Tanks will provide an operational and maintenance/service contract for each Aswaflow Treatment System in accordance with good practice and local regulations.


Here at Corcoran Precast Tank the Aswaflow Treatment System is supplied and installed, using experienced staff. All our systems are commissioned on receipt of payment. The system is delivered on a platform-bodied truck with rear mounted articulating crane and placed in its final position.
Planning Applications

Upon receipt of a Site Characterisation Form, Corcoran Precast Tanks can draft up a detailed specification package, to meet with Local Authority Planning requirements – specific to every site. This will include the selection of the correct size of treatment unit.


We Supply Wastewater Treatment Systems to:






Industrial Buildings

Any commercial or domestic sites



Aswaflow uses sequencial batch reactor technology to treat wastewater to surpass the minimum standards set out by the EPA. An SBR system only uses the minimum amount of energy required to treat the wastewater hence limiting electricity usage. When there is no demand on the system (e.g. holidays etc.) it automatically goes into eco-mode, only using enough energy to keep the bacteria alive.
The wastewater treatment system is separated into two chambers. Raw sewage enters the first chamber where it is stored while treatment is undergone in the second chamber. The first chamber also prevents any large solids from entering the second chamber. The second chamber treats the wastewater prior to discharge into the percolation system.


1. Fill: Wastewater is transferred from the first chamber into the second chamber via a siphon pipe primed by the sludge pump. An equal amount of wastewater is transferred every time. If the required amount is not available within the first chamber the next phase (React) will not commence until the quantity of wastewater is available.

2. React: The Aswaflow system uses bacteria already in the chamber to degrade the impurities within sewage. This is achieved by agitating the contents of the tank to mix the sewage with the existing contents of the chamber. Oxygen is added using an aerator to allow this bacteria to thrive and efficiently remove the sewage's impurities. To prevent excessive amounts of sludge building up in the second chamber a small portion of sludge is intermittently pumped back to the first chamber using the sludge pump.

3. Settle: The react phase finishes after a set period of time, all equipment is then switched off allowing the sludge and bacteria within the tank to settle out. This produces a clarified volume of water on the top of the chamber.

4. Discharge: This phase removes the clarified volume of water. The clarified effluent is pumped to the percolation system using the clear water pump. The volume of water discharged is equal to the volume added in the fill phase and is ditated by the float switch.





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Co. Carlow


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