Which treatment level contains the least suspended solids and CBOD5?

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Multiple Choice

Which treatment level contains the least suspended solids and CBOD5?

Explanation:
As treatment level increases, more steps are used to remove solids and break down organic matter, so the effluent gets cleaner. Suspended solids are physical particles that settle out or are trapped by filtration, while CBOD5 measures the amount of organic matter that would consume oxygen during a five-day test. Level IV includes the most thorough treatment processes—additional filtration, polishing, and often disinfection—which remove more solids and degrade more organic material. That’s why it has the least suspended solids and the lowest CBOD5. The earlier levels provide progressively less treatment, so they leave more solids and a higher CBOD5 than Level IV.

As treatment level increases, more steps are used to remove solids and break down organic matter, so the effluent gets cleaner. Suspended solids are physical particles that settle out or are trapped by filtration, while CBOD5 measures the amount of organic matter that would consume oxygen during a five-day test. Level IV includes the most thorough treatment processes—additional filtration, polishing, and often disinfection—which remove more solids and degrade more organic material. That’s why it has the least suspended solids and the lowest CBOD5. The earlier levels provide progressively less treatment, so they leave more solids and a higher CBOD5 than Level IV.

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