Colorado Wastewater (WW) Operator D Practice Exam

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If dairy wastewater BOD is around 1,000 mg/L, but can be as high as 10,000 mg/L, which statement best describes its range?

Typically around 100 mg/L but can be higher Typically around 1,000 mg/L but can be as high as 10,000 mg/L Always exactly 1,000 mg/L Typically around 50,000 mg/L

Correct Answer:

Typically around 1,000 mg/L but can be as high as 10,000 mg/L

Explanation:

The key idea is that dairy wastewater BOD is variable but centers around a fairly high value. It’s typically about 1,000 mg/L, with potential spikes up to around 10,000 mg/L depending on factors like process activity and cleaning cycles. So the statement that best fits is that dairy wastewater BOD is usually near 1,000 mg/L but can reach as high as 10,000 mg/L. The other descriptions don’t match this variability: 100 mg/L is far too low for dairy waste, 50,000 mg/L exceeds the stated maximum, and saying it’s always exactly 1,000 mg/L ignores natural fluctuations.

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