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In which one of the following, the BOD (...

In which one of the following, the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order ?

A

`SE lt S lt PE lt DE`

B

`SE lt PE lt S lt DE`

C

`PE lt S lt SE lt DE`

D

`S lt DE lt PE lt SE`

Text Solution

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The correct Answer is:
To determine the ascending order of Biochemical Oxygen Demand (BOD) for sewage (S), distillery effluent (DE), paper mill effluent (PE), and sugar mill effluent (SE), we can follow these steps: ### Step-by-Step Solution: 1. **Understand BOD**: BOD (Biochemical Oxygen Demand) is a measure of the amount of oxygen required by microorganisms to decompose organic matter in water. Higher BOD values indicate more pollution and a greater demand for oxygen. 2. **Research Typical BOD Values**: - **Paper Mill Effluent (PE)**: Generally has a lower BOD compared to other industrial effluents, often ranging from 20 to 100 mg/L. - **Sewage (S)**: Typically has a moderate BOD, usually around 200 to 300 mg/L. - **Sugar Mill Effluent (SE)**: Can have a higher BOD, often ranging from 200 to 400 mg/L. - **Distillery Effluent (DE)**: Usually has the highest BOD, often exceeding 500 mg/L. 3. **Arrange in Ascending Order**: Based on the typical BOD values: - Paper Mill Effluent (PE) < Sewage (S) < Sugar Mill Effluent (SE) < Distillery Effluent (DE) 4. **Conclusion**: The ascending order of BOD is: - Paper Mill Effluent (PE) < Sewage (S) < Sugar Mill Effluent (SE) < Distillery Effluent (DE) 5. **Select the Correct Option**: Based on the analysis, the correct option that represents this order is the third option. ### Final Answer: The ascending order of BOD is: Paper Mill Effluent (PE) < Sewage (S) < Sugar Mill Effluent (SE) < Distillery Effluent (DE). Thus, the correct answer is option number three. ---
To determine the ascending order of Biochemical Oxygen Demand (BOD) for sewage (S), distillery effluent (DE), paper mill effluent (PE), and sugar mill effluent (SE), we can follow these steps: ### Step-by-Step Solution: 1. **Understand BOD**: BOD (Biochemical Oxygen Demand) is a measure of the amount of oxygen required by microorganisms to decompose organic matter in water. Higher BOD values indicate more pollution and a greater demand for oxygen. 2. **Research Typical BOD Values**: - **Paper Mill Effluent (PE)**: Generally has a lower BOD compared to other industrial effluents, often ranging from 20 to 100 mg/L. ...
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