Normally, the effluents are running through a pretreatment plant consisting of a sedimentation pool and a separator. The emulsions are fed to the processing plant from a subsequent reservoir by means of a submersible pump.
After filling of the plant predetermined solid or liquid separating and flocculating agents are added and homogenized. Here a separation of emulsions takes place and the pollutants are bound in a flock. If necessary the pH-value is controlled and corrected by adding base or acid.
In the sedimentation reactor the phase separation is effected by deposited flocks thus forming a clear water zone.