EN 12255-4:2023

Wastewater treatment plants - Part 4: Primary treatment

General information

60.60 Standard published   Mar 1, 2023


CEN/TC 165 Waste water engineering

European Norm

13.060.30   Sewage water


This document specifies the design requirements for plant and equipment to remove solids, other than screenings and grit, from raw wastewater, at wastewater treatment plants for over 50 PT.
It includes primary treatment with sedimentation, fine screens and micro-screens.
NOTE 1 The removal of screenings and grit is covered in EN 12255-3.
NOTE 2 Dissolved air flotation (DAF) is not covered in detail in this document because it is not commonly used for primary treatment in municipal wastewater treatment plants. It can be used for primary treatment of industrial wastewater, but then the design is specific to the application.

Life cycle


EN 12255-4:2002


EN 12255-4:2023
60.60 Standard published
Mar 1, 2023