The role of coagulation in water treatment is important: it is the process of reducing the electric repulsion between particles by the addition of iron or aluminum salts (inorganic coagulants) to the water. The positive charge of the inorganic coagulant neutralizes the negative charge of the particles in the water, causing the particles to aggregate. During the coagulation process, flocs grow to a limited size, depending on pH, temperature, dose, shear rates, and the type of coagulant used.
Coagulation can successfully remove a large amount of particles (including most of the microplastics) and dissolved matter from water. In many applications, such as phosphorus removal from wastewater, chemical treatment using an inorganic coagulant has been shown to deliver better results than any other method.
In wastewater treatment, choosing the right coagulant and dosage is very important. The pH of the wastewater is also very significant – the optimum pH range for precipitation with aluminum salts is between 5-7, while iron salts can be used in the range 5-11.
MCAS’s range of inorganic coagulants used in water treatment is very comprehensive and includes a variety of aluminum based coagulants, iron sulphate based coagulants and iron chloride based coagulants.
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