EN 12255-4:2002
Wastewater treatment plants - Part 4: Primary settlement
- Standard No.
- EN 12255-4:2002
- Release Date
- 2002
- Published By
- European Committee for Standardization (CEN)
- Status
- Replace By
- EN 12255-4:2023
- Latest
- EN 12255-4:2023
- Scope
- This European Standard specifies the non-steady state measurement of the oxygen transfer rate andThe oxygen transfer efficiency of aeration systems in activated sludge aeration tanks (see EN 12255-6) when filled with clean water.NOTE 1This is known asThe clean water test.NOTE 2 SinceThe method is based on completely mixed tanks or tanks with evenly distributed aerators or diffusers test results from certain aeration installations can be incorrect.NOTE 3 Under process conditions with mixed liquorThe oxygen transfer rate andThe oxygen transfer efficiency can be different fromThe clean water test results.This is expressed byThe α-factor
EN 12255-4:2002 history
- 2023 EN 12255-4:2023 Wastewater treatment plants - Part 4: Primary treatment
- 2002 EN 12255-4:2002 Wastewater treatment plants - Part 4: Primary settlement
