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Biological Oxygen Demand Removal Efficiency


    

Biological Oxygen Demand (BOD) Removal Efficiency Formula

\( BOP_{re} \;=\;  \dfrac{ BOD_i \cdot BOD_e }{ BOD_i }  \cdot 100  \)    (BOD Removal Efficiency)

\( BOD_i \;=\;   BOD_e \cdot  \dfrac{ 100 }{ 100 -  BOD_{re} }  \) 

\(  BOD_e \;=\; BOD_i \cdot  \left(  1 -  \dfrac{ BOP_{re} }{ 100 } \right) \) 

Symbol English Metric
\( BOP_{re} \) = BOD Removal Efficiency - \(dimensionless\)
\( BOD_i \) = BOD Concentration in the Influent (Incoming Water) - \(mg\;/\;L\)
\( BOD_e \) = BOD Concentration in the Effluent (Teated Wastewater) - \(mg\;/\;L\)

Biological oxygen demand (BOD) removal efficiency is a parameter used in wastewater treatment to assess the effectiveness of a treatment process in reducing the organic pollutants in water.  BOD measures the amount of oxygen required by aerobic microorganisms to break down organic matter in water over a specified period, usually 5 days (\(BOD_5\)).

BOD removal efficiency indicates how well a wastewater treatment system, like a biological treatment plant, is removing organic material from the influent (untreated wastewater).  It is typically calculated as a percentage, comparing the BOD levels in the influent (incoming water) to those in the effluent (treated water).

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