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eng.wastewater-bod-removal Calculator
Calculates wastewater BOD removal efficiency, effluent quality, and required aeration oxygen from influent BOD and treatment parameters. Secondary treatment achieves 85–95% BOD removal — the EPA secondary treatment standard requires BOD ≤ 30 mg/L and TSS ≤ 30 mg/L.
Inputs
Influent Bod Mg L
Reference formula or conversion factor shown for context.
Effluent Bod Mg L
Reference formula or conversion factor shown for context.
Flow Rate Mld
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
Hrt Hours
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
BOD removal efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
BOD removed (kg/day)
Reference formula or conversion factor shown for context.
reactor volume (m³)
The computed three-dimensional volume.
effluent quality
A qualitative assessment of how the result compares to the desired standard or benchmark.
volumetric BOD load
The computed three-dimensional volume.
HRT
Reference formula or conversion factor shown for context.