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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. Continue reading