Physical and chemical processes characterize the primary treatment system; the main objective of this process is the removal of sedimentable suspended solids, fluctuating materials and parts of organic matter in suspension.

The treatment process is constituted by:

Sieving: The raw effluent passes through a rotating hydrostatic type screen to remove coarse solid particles, solids are sent to the sludge-processing centre and the liquid goes to the equalization tank.

Equalization/Homogenization: The effluent is stored in a tank with adequate detention time for each effluent. In this tank, a hyperbolic mixer, with the objective to keep solids in suspension, constantly homogenizes the effluent and O&G dispersed in the liquid medium.

Mechanical or hydraulic flocculation: The effluent receives doses of chemical products, which help for its neutralization, coagulation and flocculation, the process can be mechanical with the help of mixers or hydraulic, through a turbulent circuit. What will define which type should be used are the characteristics of the effluent.

Dissolved Air Flotation – DAF: Designed to remove oils and fats, Suspended Solids and Organic Loads (DBO and DQO). The removal process is based on the contact and adhesion of air microbubbles with the effluent particles, decreasing its density and thus promoting its flow to the liquid surface of the tank, where, physically, the solids are removed by scrapers and discharged into a sludge discharge chamber. Then destined for the sludge-processing centre. The clarified liquid is destined for the Secondary Treatment System.