PFL Flocculator for coagulation-flocculation

We supply PFL flocculators, which are characterized by the "inline process principle". The different processes occurring in the inline flocculator, such as coagulation, flocculation, deemulsification, precipitation and pH control, take place under very controlled and well-defined conditions, so that the effluent can be easily clarified in our DAF systems.

Flocculators for wastewater clarification

Flocculators provide the necessary conditions for the chemical treatment of the wastewater that is introduced into them. With the use of coagulants, the formation of micro floccules is achieved, which are agglomerated during the flocculation process, thus obtaining larger floccules. Thanks to the formation of these larger floccules, the separation of clean water can be carried out easily and efficiently in our dissolved air flotation equipment.

Our PFL flocculators for the coagulation-flocculation process have the following characteristics:

  • Compact equipment
  • Size adjusted to the customer's needs
  • Air injection points
  • Tubes designed to promote chemical mixing and avoid "cutting" the floccules, thus promoting the formation of macro-flocculi.
  • Dosing pumps
  • Wastewater condition monitoring points
  • Touch screen for programming operating parameters
  • Construction material adapted to the customer's needs


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

Coagulant is usually added to the water at the beginning of the flocculator. Coagulation is the destabilization of the contaminating matter in the influent. Immediately after the dosing point, a unit is installed to mix coagulant and water. Fine particles are formed. Most of the time, these particles are not ideal for separation. If this is the case, the flocculant must be dosed to obtain particles of separable size.

Flocculant dosing takes place in a second mixing unit. Floc growth will be completed in the pipeline following the mixing unit. This will form an ideal uniform floc with excellent separation characteristics.

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


  • No moving parts, no need for additional mixers.
  • No maintenance and operating costs.
  • Durable high quality materials such as PVC, HDPE or AISI316 pipes, standard AISI304 brackets
  • No short circuit.
  • Fully predictable and controlled mixing environment.
  • Uniform floc growth.
  • Compact, requires little installation space.
  • All required process conditions and chemical additions in a single unit.
  • Customized design.

Table of characteristics


Coagulation-flocculation process

The function of a flocculator is to slowly agitate the mass of coagulated water in such a way as to promote the growth of floccules and facilitate their preservation. This process takes place until the suspension of water and flocs leaves the flocculator.

Compounds that may be present in water may include:

  • Suspended solids.
  • Colloidal particles (less than 1 micron), governed by Brownian motion.
  • Dissolved substances (less than several nanometers).

The flocculation process is always accompanied by a previous coagulation phase. This treatment, widely known as coagulation-flocculation, is carried out to remove suspended substances and colloidal particles.

Coagulation uses a chemical reagent, called a coagulant, to destabilize the particles until they stick together.

Through flocculation, the destabilized particles unite and form micro flocs that are later transformed into larger flocs, which have sufficient flotation capacity to be effectively removed by the microbubbles generated in our DAF systems. The most efficient type of flocculant for each case depends on the characteristics of the effluent and, for this reason, it is necessary to carry out preliminary tests to determine the flocculant to be used.

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