ONORM EN 12255-16 : 2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
  4.1 General
  4.2 Process types
       4.2.1 Granular media filters
       4.2.2 Microstrainers and drum filters
5 Planning
6 Process design
  6.1 Design parameters
  6.2 Selection of filter media
       6.2.1 General
       6.2.2 Granular media filters
       6.2.3 Microstrainers and drum filters
  6.3 Cleaning systems
       6.3.1 General
       6.3.2 Granular media filters
       6.3.3 Microstrainers and drum filters
  6.4 Dimensions
       6.4.1 General
       6.4.2 Granular media filters
       6.4.3 Microstrainers and drum filters
  6.5 Flow distribution
       6.5.1 General
       6.5.2 Granular media filters
       6.5.3 Microstrainers and drum filters
  6.6 Construction principles
       6.6.1 General
       6.6.2 Granular media filters
       6.6.3 Microstrainers and drum filters
  6.7 Mechanical and electrical equipment
       6.7.1 General
       6.7.2 Granular media filters
       6.7.3 Microstrainers and drum filters
  6.8 Performance monitoring
  6.9 Additional considerations
       6.9.1 Maintenance
       6.9.2 Protection of the equipment
  6.10 Hazard protection
Bibliography

Defines design principles and performance requirements for tertiary clarification (receiving effluent from secondary treatment) by physical filtration plant at wastewater treatment plants serving more than 50 PT.