But basically, the sewage treatment equipment should be the first grating, filtration.
Regulation tank, water quality and quantity of water to carry out a stabilizing effect.
Different wastewater according to which contains different treatment equipment. I do not know what equipment you, roughly speaking, there are sedimentation tank coagulation tank gravity centrifugal degreasing, etc. First use physical means for preliminary treatment.
Then there is biological treatment, anaerobic and anoxic treatment.
The last special is chemical treatment.
Equipment for different treatment methods correspond to different equipment.