Question

in the united states, federal law requires that secondary wastewater treatment plants remove at least ______ percent of the bod and suspended solids from the raw wastewater.
a. 75%
b. 45%
c. 85%
d. 95%

Explanation:

Secondary wastewater treatment plants in the US, as per federal law, are required to remove a significant portion of BOD (Biochemical Oxygen Demand) and suspended solids. The standard requirement is that they must remove at least 85% of these components from raw wastewater. This is based on environmental regulations aimed at protecting water bodies from pollution caused by untreated or under - treated wastewater.

Answer:

C. 85%