Wastewater
Activated Sludge Desired F/M
(food to microorganism) Ratio
 Return
to F/M Calculation Detail
The F/M ratio calculation is just one of the process control parameters
you should monitor in your activated sludge system. The following are suggested operating
parameters for F/M Ratio. The optimum F/M ratio for your plant can only be determined by
monitoring facility performance through regular process control testing.
| Conventional Activated Sludge (F/M) |
0.2 - 0.5 |
| Contact Stabilization (F/M) |
0.15 - 0.2 |
| Extended Aeration (F/M) |
0.01 - 0.07 |
| Step Aeration (F/M) |
0.2 - 0.5 |
| Two-Stage Aeration (F/M) |
0.07 - 0.15 |
|
