Clean Water Removal

Clean Water Removal AW-HYDROKLAR-PLUS

Automatic clean water removal from SBR and sedimentation tanks with compact design for discharge quantities up to 300 m³/h

operational area | usage

  • SBR wastewater treatment plants
  • Industrial plants with sedimentation tanks

product description

The task of clean water removal in the SBR technology or in settlement tanks, following sufficient sedimentation of the activated sludge, to separate the clean water, without picking up unacceptable quantities of activated sludge or floating sludge parts by mixing the liquid layering or surface removal. The Hydroklar-Plus is designed as a compact remover based on a drip channel gate with discharge chamber. The overflow edge of the gate is located above the water level, outside of the removal phase. The start and end of the removal phase can be set according to a time, level or turbidity regime. The time-controlled or turbidity-controlled start signal switches on the drive motor and the gate is opened via the spindle. The clean water flows over the overflow edge of the gate in the discharge chamber. The scumboard connected to the gate ensures that the floating sludge is held back. The inlet area of the scumboard is designed to ensure horizontal, surface inflow. In this way it is possible to move very close to the sedimentation boundary and to achieve a maximum exchange volume, without the sedimented sludge being swirled up to an unacceptable extent. On reaching the specified fill level or exceeding the turbidity limit the drive is stopped and removal is ended. The gate is moved to its top end position or is controlled in the turbidity regime so that it continuously moves ahead of the rising water level.

constructional features

  • Preassembled dropped channel gate with discharge chamber (made of stainless steel) in compact design is anchored onto the tank wall
  • Flow-optimised surface inlet prevents inlet turbulence
  • Front-mounted, floating sludge repelling scumboard
  • Controllable electric motor drive
  • Control system by time, discharge quantity and turbidity possible
  • Dynamic control system simultaneously adjusts the overflow edge to the falling sludge layer
  • Heating strip surrounds the gate guide (optional)
  • Device for sampling in the discharge chamber


  • Simple, compact design with high degree of functional safety and reliability results in shortening of the removal times and maximising of the exchange volume
  • Sludge barrier prevents the removal of floating sludge
  • Turbidity as the control variable results in controlled clean water removal, saving of response time due to the overlapping of sedimentation and removal time
  • Functions as an emergency overflow and can be optionally equipped with heating and sampling
  • Good accessibility for maintenance and inspecting the discharge
  • Can be used for new wastewater treatment plant construction and retrofitting


Datasheet Clean Water Removal

contact person

Holger Wünsch
Product manager

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