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HYBACS - Energy-Efficient Hybrid Activated Sludge Technology

Source: Degremont Technologies

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The HYBACS proacess is an innovative hybrid activated-sludge system that is well-suited for municipal and industrial WWTPs looking for an economical technology for capacity upgrades and nutrient removal capabilities.

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The HYBACS proacess is an innovative hybrid activated-sludge system that is well-suited for municipal and industrial WWTPs looking for an economical technology for capacity upgrades and nutrient removal capabilities.

The HYBACS system utilizes an innovative nutrient removal hybrid activated-sludge process. The process consists of two biological stages followed by clarification. 

  1. The first stage comprises of SMART™ units, with attached biomass. 
  2. The second stage is an activated sludge process, with suspended biomass.

SMART™ units are a type of biological reactor comprising plates fixed to a rotating structure. The plates are manufactured from mesh with a porosity of 95%, which produces a biological environment containing aerobic, anoxic and anaerobic regions, supporting a large quantity of attached biomass with substantial diversity and activity, ensuring high treatment capacity.

Aeration from Rotation The biomass partially drains as the plates rotate so that both liquor containing the pollutants and air flow by convection in and out of the plates. Thus, as the plates rotate, the biomass is aerated from the atmosphere above the liquor, and brought into contact with pollutants when submerged. This convective flow substantially increases the transfer rate of pollutants and oxygen to the biomass, increasing its utilisation and activity.

Optimized Aeration Tanks Because of the high efficiency of the SMART™ units, the size of the downstream aeration tanks can be reduced by 50%, compared with a conventional activated sludge plant for nutrient removal.

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