BOD / COD Removal Efficiency Calculator
Calculate the pollutant removal efficiency of a treatment process from influent and effluent concentrations.
Removal efficiency
Formula
Efficiency (%) = (Influent − Effluent) ÷ Influent × 100
Efficiency (%) = (Influent − Effluent) ÷ Influent × 100
Typical removal benchmarks
| Process | BOD₅ removal |
|---|---|
| Primary sedimentation | 25 – 40% |
| Trickling filter | 80 – 90% |
| Activated sludge | 90 – 97% |
| MBR | > 97% |