The PFL-flocculator is characterised by the plug flow principle. The processes in the pipe flocculator, such as coagulation, flocculation, de-emulsification, precipitation and pH control, can take place under highly controlled and well-defined conditions.

The retention time in the pipe flocculator is almost uniform and the mixing energy is constant in the pipe cross-section. In this way, all particles will be subject to the same amount of mixing energy and for the same period. This will result in a highly uniform floc with excellent separation characteristics.

A coagulant is usually dosed to the raw water at the inlet-side of the flocculator. Coagulation is the destabilisation of the polluting matter in the influent. Immediately after the dosing point, a mixing unit is installed for the mixing of coagulant and water. Fine particles are now formed. Most of the time these particles are not ideal for separation. If this is the case, flocculent has to be dosed to obtain separable sized particles.

In the pipe following the mixing unit is a flocculent dosed. Mixing of water and flocculent takes place in a second mixing unit. Floc growth will be completed in the pipe following the mixing unit. In this way an ideal uniform floc, with excellent separation characteristics will be formed.

The flocs and the water can now be separated in a separator.

The flocculator can be provided with additional fittings, which makes it possible to dose chemicals for pH-correction and pH- measurement.


  • No moving parts, no additional mixers needed.
  • No maintenance and operation costs.
  • High quality durable materials such as PVC, HDPE or AISI316 pipes, standard supports of AISI304.
  • No short-circuiting.
  • Completely predictable and controlled mixing environment.
  • No additional energy source needed.
  • Uniform floc growth.
  • Compact, little installation space required.
  • All required process conditions and chemical additions in a single unit.
  • Custom build.

Features data

(*) Capacity = hydraulic capacity