Standards

Techneau particulate clarifiers are manufactured either in S235JR boilermaking steel (NF EN 10025 standard) with an external and internal two-component epoxy coating, or in polyester.
Structural stability and requirements for materials and coatings comply with the normative requirements defined in NF EN 858-1 and P16-454-1/CN.

Motifs décoratifs pour les contenus

Dimensions

Depending on location, rainfall of less than 16mm/h represents 75 to 95% of cumulative precipitation. Under steady-state conditions, a rainfall intensity of 16 mm/h, combined with a 90% impermeability coefficient, produces an associated runoff flow of 40 L/s/a, the value adopted as the treatment flow rate for a particulate clarifier.

This threshold enables treatment of

  • Runoff from the leaching phase (low flows with high concentrations)
  • The vast majority of runoff, depending on the region

The operating principle

Techneau particulate clarifiers consist of 3 successive compartments:

 

Grit trap (Macro-waste trap): The grit trap is the first compartment of the clarifier. Its role is to trap heavy matter and macro-waste present in the water. Heavier particles, such as sand, gravel and debris, settle to the bottom of the grit chamber. The purified water then continues on to the second compartment.

Settling and Storage of Suspended Solids (Tubular Beam): The second compartment is dedicated to settling. Its purpose is to separate suspended solids from the water. Inside, a tube bundle is used to extend the water’s residence time. This encourages the settling of finer particles. TSS settles to the bottom of the tube bundle. The clarified, lighter water flows into the third compartment.

Return of treated water : The third compartment is where the treated water is returned. Once the suspended solids have been removed, the clarified water is collected and discharged to the treatment or discharge network in compliance with environmental standards.