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Replacement for Primary Settling Tanks

Replacing the primary clarifier with a fine screen – HUBER CarbonWin®

In the HUBER CarbonWin® process, the primary clarifier is replaced by a fine screen. This results in the following advantages:

  • Only 1/10 of the space required compared to conventional primary clarifiers
  • Minimised investment and operating costs
  • Suitable to be integrated into existing plants

The primary clarifier is the last stage of the mechanical pre-treatment of a wastewater treatment plant and works according to the anaerobic sludge stabilisation process.

In the primary settling tank, undissolved organic and inorganic substances settle at low flow velocities and with sufficient retention time and thus build the primary sludge. This is then added to the digester – usually after mechanical thickening – together with the excess sludge. In the anaerobic process, the sludge is converted into digester gas, which can be used for energy generation.

Sewage treatment plants that work according to the principle of aerobic sludge stabilisation usually do not have a primary clarifier. However, the advantage of the simpler process technology is offset by high energy consumption, because sludge stabilisation takes place simultaneously with biological wastewater treatment through a correspondingly long aeration period (high sludge age).

Aerobic sludge stabilisation is more common in smaller wastewater treatment plants up to about 20,000, sometimes up to 50,000 population equivalents (p.e.).

Driven by constantly rising energy costs and technical innovations in the field of sludge digestion and digester gas utilisation, anaerobic sludge treatment is gaining in importance also for smaller sewage treatment plants designed for fewer than 50,000 PE. For an economic and energy-optimised conversion from aerobic to anaerobic sludge stabilisation, the use of a primary clarifier is usually unavoidable.

The primary clarifier is replaced by a HUBER Drum Screen LIQUID micro screen
HUBER Drum Screen LIQUID Mesh as an economical alternative to primary sedimentation. For best separation efficiency and COD separation performance
HUBER Drum Screen LIQUID Mesh as an economical alternative to primary sedimentation. For best separation efficiency and COD separation performance
Screenings separated by the HUBER Drum Screen LIQUID mesh: The load to be handled in the biological treatment stage is reduced and more gas can be produced in the digester
Screenings separated by the HUBER Drum Screen LIQUID mesh: The load to be handled in the biological treatment stage is reduced and more gas can be produced in the digester
HUBER Drum Screen LIQUID Mesh during installation: Integrated service water supply makes external service water for main cleaning obsolete.
HUBER Drum Screen LIQUID Mesh during installation: Integrated service water supply makes external service water for main cleaning obsolete.
HUBER Drum Screen LIQUID Mesh instead of cost- and space-intensive primary sedimentation. Only 1/10 of the space required for primary sedimentation.
HUBER Drum Screen LIQUID Mesh instead of cost- and space-intensive primary sedimentation. Only 1/10 of the space required for primary sedimentation.
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Carbon Removal

The HUBER CarbonWin® Process

The HUBER CarbonWin® system offers an interesting and economical possibility to do removal of carbon without a primary settlement tank when converting from aerobic to anaerobic sludge stabilisation.

In order to achieve the required carbon removal from the biological treatment stage, HUBER uses the fine screening process with the HUBER Drum Screen LIQUID.

The advantages are low investment costs and a 90% reduction in space requirements.

The HUBER Drum Screen LIQUID can also be used to relieve an existing primary clarifier. In case of overload of the primary clarifier, a partial flow can be treated with the HUBER Drum Screen LIQUID.

Case Studies

HUBER Solutions in Operation

Busy - the mobile plants with HUBER Drum Screen LIQUID help in planning and operation

HUBER supplies a process system as replacement for the primary settling tank

Carbon removal with HUBER fine screening technology – a success story

New product HUBER Drum Screen LIQUID: Increasing requirements need adapted solutions

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