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sci.wastewater-BOD-removal Calculator
Calculates wastewater BOD removal efficiency E = (BOD_in − BOD_out)/BOD_in × 100% and required hydraulic retention time from first-order removal kinetics. Activated sludge achieves 85–95% BOD removal at HRT = 6–8 hours — trickling filter at 3–5 m depth achieves 80–90% with lower energy but more land area.
Inputs
Bod In Mg L
Reference formula or conversion factor shown for context.
Flow M3 Day
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
K Bod Per Day
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Hrt Hr
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
effluent BOD (mg/L)
Sample size or count used in the calculation.
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%.