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Types of coagulants and flocculants


There is a wide range of commonly used coagulants and flocculants for the clarification of various types of wastewater.

In general, they can be classified into two types: inorganic and organic. The inorganic compounds are usually metal salts, typically aluminium or iron (with the most widely used being aluminium sulfate, iron sulfate and iron chloride); while the organic compounds are polymers (polyelectrolytes), and represent a wide variety of water soluble macromolecular compounds of natural or synthetic origin, which have the property of enhancing the flocculation of suspended particles. In the 1980s, coagulants called metal salt prepolymers began to be developed, among which Poly Aluminium Chloride (PAC) is one of the most important and has become a very common compound used in coagulation and flocculation processes.

Conventional flocculants and coagulants based on aluminium salts and polymers have some disadvantages: a large amount of product is required, and they are difficult to store, handle and dispense.

There are also some very significant risks associated with their use, as they pollute the environment and are toxic to humans, causing diseases such as cancer or Alzheimer’s disease.

Conventional flocculants and coagulants based on aluminium salts and polymers are toxic and difficult to handle.


NIHON KASETSU has developed a truly innovative reagent, which is inorganic in origin, and is composed of 100% natural, non-polluting substances, whose raw materials are fossils of coral, sea shells, seaweed and minerals. It is a highly efficient flocculant, which is safe and easy to handle. Any type of wastewater can be treated; it can be used in both freshwater and saltwater and is largely insensitive to pH and temperature. In addition, it contains no substances which are harmful to the environment.

PW1 Eco

2 thoughts on “Types of coagulants and flocculants

  1. Pingback: Wastewater treatment in construction | NIHON KASETSU WATER

  2. I just wanted to thank you for helping me understand more about coagulants and flocculants. I actually didn’t know that those that are based on aluminium salts could be harder to handle. I’m kind of interested to learn more about what the handling process is like and some of the different tools that could be used for this.


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