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.
During filling of the plant predetermined solid or liquid separating and flocculating agents are added and mixed in a homogenous process. Here separation of emulsions takes place and the pollutants are bound in a flock.
At the same time the pH-value is controlled and corrected by adding base or acid if necessary.