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BOD removal efficiency is an important measure of how effectively a wastewater treatment system reduces biological oxygen demand (BOD). It indicates the percentage of BOD removed during treatment, reflecting the system’s performance in reducing organic pollutants.
What is BOD Removal Efficiency?
BOD removal efficiency quantifies the percentage of BOD eliminated from influent to effluent. It helps assess whether a treatment system meets environmental standards and operates effectively.
How to Calculate BOD Removal Efficiency
The calculation involves measuring BOD levels before and after treatment. The formula is:
BOD Removal Efficiency (%) = [(BOD_in – BOD_out) / BOD_in] × 100
Example Calculation
If the influent BOD is 200 mg/L and the effluent BOD is 50 mg/L, the removal efficiency is:
BOD Removal Efficiency = [(200 – 50) / 200] × 100 = 75%
Factors Affecting BOD Removal
Several factors influence BOD removal efficiency, including:
- Type of treatment process
- Operational conditions
- Sludge age and concentration
- Influent BOD levels