2. Pretreatments

Pre-treatments are designed to separate wastewater :

• bulky solids that could clog the treatment plant's pipes;

• floating matter and liquid pollutants (oils, hydrocarbons) immiscible with water and generally less dense than it.

They consist of a series of physical and mechanical operations: screening, sieving, grit removal, oil and grease removal, the implementation of which largely depends on the nature and characteristics of the industrial waste to be treated and also on the downstream treatment line