BOD Removal Efficiency of Treatment
EasyBODtreatment efficiency
A treatment process decreases BOD from 200 mg/L to 20 mg/L. What is the BOD removal efficiency?
- A10%
- B20%
- C80%
- D90%
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Answer: D. 90%
Removal efficiency = (Cin − Cout)/Cin × 100% = (200 − 20)/200 × 100% = 90%. The 10% remaining is not the percent removed.
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