What is the ideal BOD level for treated wastewater?

What is the ideal BOD level for treated wastewater?

• A. Less than 15 mg/L
• B. Less than 30 mg/L
• C. Less than 50 mg/L
• D. Less than 100 mg/L

Answer: (B)

A BOD (Biochemical Oxygen Demand) level of less than 30 mg/L is considered ideal for treated wastewater because it indicates that the treatment process has effectively reduced the organic matter to a level that is less likely to deplete the oxygen in receiving water bodies. This is crucial for maintaining aquatic life and minimizing pollution. In this context, BOD is a measure of how much oxygen is required by bacteria to decompose organic material in water. A lower BOD level signifies better treatment and a healthier environment for aquatic organisms. Levels above 30 mg/L may still be acceptable in some contexts but could indicate that further treatment is needed to reach optimal conditions for discharge and to comply with regulations. In contrast, levels above this threshold, such as 50 mg/L or 100 mg/L, could pose risks to water quality and aquatic ecosystems, as they suggest a higher potential for oxygen depletion in receiving waters.

A BOD (Biochemical Oxygen Demand) level of less than 30 mg/L is considered ideal for treated wastewater because it indicates that the treatment process has effectively reduced the organic matter to a level that is less likely to deplete the oxygen in receiving water bodies. This is crucial for maintaining aquatic life and minimizing pollution.

In this context, BOD is a measure of how much oxygen is required by bacteria to decompose organic material in water. A lower BOD level signifies better treatment and a healthier environment for aquatic organisms. Levels above 30 mg/L may still be acceptable in some contexts but could indicate that further treatment is needed to reach optimal conditions for discharge and to comply with regulations.

In contrast, levels above this threshold, such as 50 mg/L or 100 mg/L, could pose risks to water quality and aquatic ecosystems, as they suggest a higher potential for oxygen depletion in receiving waters.