the influent bod concentration to an activated sludge plant is 200 mg/l. if the effluent bod concentration is 10 mg/l, what is the overall efficiency of the plant?

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Question

the influent bod concentration to an activated sludge plant is 200 mg/l. if the effluent bod concentration is 10 mg/l, what is the overall efficiency of the plant?

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Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Solids Removal Calculation" ], "new_concepts": [ "BOD Removal Efficiency" ], "current_concepts": [ "Solids Removal Calculation", "BOD Removal Efficiency" ] } ## Identify the given values and formula $$ \begin{aligned} &\text{Influent BOD } (C_{\text{in}}) = 200\text{ mg/L} \ &\text{Effluent BOD } (C_{\text{out}}) = 10\text{ mg/L} \ &\text{Efficiency } (\eta) = \frac{C_{\text{in}} - C_{\text{out}}}{C_{\text{in}}} \times 100\% \end{aligned} $$ ## Calculate the overall efficiency $$ \begin{aligned} \eta &= \frac{200 - 10}{200} \times 100\% \ &= \frac{190}{200} \times 100\% \ &= 0.95 \times 100\% \ &= 95\% \end{aligned} $$

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{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Environmental Science", "Wastewater Treatment Calculations" ] }

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Explanation:

Identify the given values and formula

Calculate the overall efficiency

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