Effective Treatment of Wastewater/sewage is Reflected in A(n)

Question

Effective treatment of wastewater/sewage is reflected in a(n)
A)lower BOD.
B)higher BOD.
C)unchanging BOD.
D)increase in sulfur.

Accepted Answer

Lower BOD (Biochemical Oxygen Demand) indicates that there are fewer organic compounds present in the wastewater/sewage, which implies that treatment has effectively removed pollutants. Higher BOD would indicate the opposite, that there is a high level of organic compounds present, indicating poor treatment. Unchanging BOD would suggest that no improvement has been made in treating the sewage. Increase in sulfur is not related to the treatment of wastewater/sewage.