SUEZ Water - Water Technologies & Water

Coagulants and Flocculants for Water Treatment

Advanced clarification aids for water treatment to reduce sludge volume and improve water quality

SUEZ’s extensive portfolio of coagulants, flocculants and custom-designed polymers help remove organic color, iron, suspended solids, and hardness from influent water. In wastewater treatment these clarification aids help with the removal of many other contaminants as well, such as oil, phosphate and heavy metals. In raw water applications, SUEZ polymer products help to eliminate the need for pH adjustment, decreases the load on demineralizers, increase filter throughout, and significantly reduce sludge volume.

Flocculation and Coagulation process

Suspended matter in raw water supplies is removed by various methods to provide a water suitable for domestic purposes and industrial requirements. The suspended matter can consist of large solids, settable by gravity alone without any external aids, and nonsettleable material, often colloidal in nature. Different variations and types of coagulants and flocculants can be used to remove these materials.

What is coagulation in water treatment?

Coagulation is the process of destabilization by charge neutralization. Once neutralized, particles no longer repel each other and can be brought together. Coagulation is necessary for the removal of the colloidal-sized suspended matter and can be accomplished through the addition of inorganic salts of aluminum or iron. These inorganic salts neutralize the charge on the particles causing raw water turbidity, and hydrolyze to form insoluble precipitates, which entrap particles. Coagulation can also be affected by the addition of water-soluble organic polymers with numerous ionized sites for particle charge neutralization.

What is flocculation in water treatment?

Flocculation is the process of bringing together the destabilized, or coagulated, particles to for a larger agglomeration, or floc. Flocculation can be enhanced by the addition of high-molecular-weight, water-soluble organic polymers, these polymers increase floc size by charged site binding and by molecular bridging.

Coagulant and Flocculant Features

SUEZ’s coagulant and flocculant products, used together with an in-depth system audit, engineering application and operational recommendations provide the following benefits:

  • Reduces fouling by solids, organics, microbiological materials and colloids
  • Increases settling rates
  • Improves filter performance
  • Reduces sludge volume
  • Improves efficiency in boiler and cooling systems
  • Improves the performance of scale inhibitors
  • Improves process operations
  • Produces cleaner, safer drinking water

Types of Coagulants and Flocculants

The coagulation and flocculation process can occur naturally in some cases or be enhanced by the addition of coagulant and flocculant aids. SUEZ offers a comprehensive portfolio of coagulants, flocculants and custom-designed polymers that aid the flocculation and coagulation process:

  • KlarAid* Coagulants – Highly charged inorganic, organic and custom blended coagulants for clarification of industrial water and wastewater.
  • PolyFloc* Flocculants – High molecular weight clarification and dewatering polymers.
  • Novus* Flocculants – Proprietary high molecular weight clarification and dewatering.

*A trademark of SUEZ. May be registered in one or more countries.


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