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Septic Tank Upgrade Systems

Septic Tank Sewage Treatment

Septic Tank Upgrade System 

 

The Duos  is an upgrade system specifically designed for working septic tanks. The aim of the Duos treatment system is to significantly improve the effluent quality which is discharged from the existing septic tank.

The Duos septic upgrade system is connected to the outlet of the Septic tank which allows the wastewater to easily flow into the Duos for further treatment. After treatment from the Duos the wastewater can now enter into either a percolation area/ polishing filter – or directly to a water course*

Duos is an ideal solution for locations where discharge is to sub-surface irrigation or to a suitable watercourse approved by a Local Authority in cases where a septic tank is no longer suitable to meet the required standards. Due to its strong & lightweight construction, Duos is easily installed resulting in minimal disruption to the surroundings.

*Consent to discharge must be received from the Environment Agency prior to discharge into a water course. It is also important to seek approval prior to modification of existing septic tanks.

Range of Duos treatment systems

Larger Duos sewage treatment systems are available on request, contact our sales department for further details.

Aeration (treatment) chamber

Wastewater enters the first chamber of the Duos from a functioning septic tank. Secondary treatment of water takes place in the aeration chamber where submerged aeration combines the principles of the bio film and activated sludge processes.

Masses of naturally occurring bacteria inhabit specially designed plastic filter media. The filter media has large surface area and is supported within the aeration zone. As the liquid flows slowly through the filter media the bacteria feed on the waste removing them from the liquid. These bacteria are sustained with air, which is continuously supplied from a purpose built low pressure, high volume air compressor in the top section of the unit.

The air is delivered through a diffused aeration system, which break the air into bubbles as they are dispersed through the aeration zone. The continuous circulation of the wastewater within the aeration zone means that the wastewater is passed through the filter media over and over. This ensures very high treatment efficiency. The purified liquid is then passed into the final settlement chamber.

Final settlement chamber

As the liquid flows from the aeration zone into the final settlement zone small quantities of bacteria may be carried with the liquid. Before discharge from the system, these solids must be separated from the liquid. With the velocity of the liquid once again slowed down and the flow path maximised the bacteria is encouraged to settle to the bottom of the tank, like sludge, through the up flow nature of the zone.

The remaining treated liquid now meets the required standard to be safely passed out of the Duos. The treated wastewater may now into either a percolation area/ polishing filter – or directly to a water course* *Consent to discharge must be received from the Environment Agency prior to discharge into a water course.

It is also important to seek approval prior to modification of existing septic tanks. Note: Traditional septic tanks & cesspools do not have compressors and there will be no mains connection. The Duos will need a mains connection of which full details can be found in the manual available in downloads under Electrical installation.

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