ACO Clara

Treatment processes

  • mechanical pre-treatment
  • biological treatment by activated sludge
  • sludge separation in final sedimentation tank

Treatment efficiency

A long-term trial run in accordance with the European standard EN 12566-3, performed in an accredited laboratory, has shown the following discharge values:

BOD₅………………………………..6.7 mg/l

COD……………………………….59.6 mg/l

TSS…………………………………..6.1 mg/l

N-NH₄……………………………….2.0 mg/l

ACO Clara wastewater treatment plants comply with the European standard EN 12566-3, which authorizes them to bear the CE mark. ACO Clara wastewater treatment plants consist of a mechanical pre-treatment part and a bioreactor.

Treatment process

Legend:

1 – pre-treatment

2 – buffer area

3 – storage part

4 – activation tank

5 – final sedimentation tank

 

Operating principle

  • The mechanical pre-treatment part consists of a sedimentation tank with a large-volume of buffer area that equalizes hydraulic irregular loading during the day. This ensures the protection of the biological line against hydraulic peaks.
  • Wastewater enters the ACO Clara treatment plant through the inlet pipe and flows into the pre-treatment sedimentation tank where particles settle at the bottom of the tank and a scum board traps floating impurities, which protects the mammoth pump from clogging.
  • Pre-treated water is constantly, in small amounts, pumped from the buffer area to the biological part of the treatment plant. This ensures even loading, which helps to achieve excellent treatment efficiency.
  • Surplus sludge is stored in the storage chamber of the pre-treatment tank. Under full load it gets completely filled within 100 – 150 days.
  • Pumping of pre-treated wastewater, return and surplus sludge, is ensured by mammoth pumps. This type of pumps is almost maintenance-free and clog-free. The flow rate of the pump can be easily controlled, so even very low flow rates can be achieved.
  • The biological part of ACO Clara treatment plant consists of an activation tank and an embedded final sedimentation tank. The activation tank is aerated by micro-bubble aeration.
  • Activated sludge from the activation tank flows into the final sedimentation tank where gravitational separation of activated sludge and treated water occurs, and treated water flows over the weir, through the outflow object and into the outlet pipe. Settled sludge is pumped from the bottom of the final sedimentation tank back to the activation tank. The final sedimentation tank can be equipped with a device that ensures automatic skimming of floating sludge in the final sedimentation tank, thus reducing the total volume of maintenance.