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  • Lamellentauchwand Typ LTW
  • Lamellentauchwand Typ LTW
Coarse solid retention

Lamella Baffle Type LTW

Coarse solids can be discharged into the pre-clarifier in the form of suspended or floating matter during the relief process. In order to prevent this, relief structures were equipped with baffles which were given the task of retaining floating matter (e.g. oils and greases) and solid matter (e.g. sanitary products such as toilet paper, sanitary towels, etc.). However, conventional baffles are only suitable for this purpose to a restricted degree since the efficiency of baffles decreases with increasing volumetric flow and the reinforced suction effect resulting from this.

The unwanted discharge of coarse matter can have various causes. On the one hand, floating matter passes the area between the threshold and the baffle without any obstructions. On the other hand, solid matter does not exclusively float on the surface of the water but can also take the form of suspended matter which is swept away by the suction effect of the overflow in case of a relief.

The modern, environmentally friendly operation of a sewer system should aim at retaining these residues according to the current state of the art in as far as possible.

Targeted retention of solids on relief thresholds in separating / discharge structures of combined sewerage systems


The BIOGEST® Lamella Baffle Type LTW is used for the targeted retention of floating matter in combined sewerage systems / storm water systems without external energy. A lamella-like arrangement of baffle plates prevents the discharge of solid matter over the threshold into the pre-clarifier. A hydraulically specified arrangement and inclination of lamellas shaped specifically for this purpose ensures that floating matter described herein above is retained efficiently.

The advantages

  • Compact structure thanks to modular arrangement
  • Modules for straight and round relief thresholds
  • Easy retrofitting in existing structures
  • Variable overflow edge for adjusting the overflow height (optional)
  • Entry possible even through very small access openings
  • Operation without external energy
  • Flexible system in terms of building geometry thanks to adaptive system variants
  • Effective retention of solids by avoiding cross currents or suction effects
  • Excellent price-performance ratio
  • Low maintenance