Waste water generated during the washing and cleaning. By dispersion and aggregation of wastewater pollution is extremely diverse. They may be present in the form: coarse substances chemical or colloidal solutions. By standards of maximum permissible discharge of pollutants regulated by the degree of contamination of waste water, which are understood as the maximum permissible mass of the substance in the effluent in the paragraph location of the water body. For sewage treatment from suspended solids and oil use mechanical, chemical and physico-mechanical methods, both independently and in combination. Mechanical cleaning methods include: -straining, -sedimentation, -filtration, -centrifugation, -separation in a hydrocyclone.