This so-called first stage of purification. These processes are intended to remove from sewage solids floating and heavy minerals and organic suspensions. They rely on mincing, cedzeniu, sedimentation, flotation, centrifugation. Mechanical methods can provide a reduction in suspensions within 60-70%, BZT5 to 20%.
Mechanical devices used in wastewater treatment:
grating,
sieves,
sand catchers,
settling tanks,
flotatory.
In most wastewater treatment plant mechanical cleaning process can not be isolated due to insufficient pre-treatment of sewage. The exception is here pre-treatment of industrial wastewater.
