Which two tests are commonly used to measure the strength of sewage?

The correct answer involves BOD, which stands for Biochemical Oxygen Demand, and SS, which refers to Suspended Solids. Biochemical Oxygen Demand is a crucial test that measures the amount of oxygen that microorganisms will consume while decomposing organic matter in sewage over a specified period. This is significant because it provides insight into the organic pollution levels in the sewage; higher BOD values typically indicate a higher level of organic material and thus a more significant environmental impact potential.

Suspended Solids (SS), on the other hand, measure the solid particles that are suspended in the sewage. This test is essential because solids can interfere with treatment processes and can indicate the degree of particulate pollution present in the wastewater.

Using these two tests together offers a comprehensive look at the strength and pollution potential of sewage, helping to assess treatment needs and environmental monitoring effectively. The combination of BOD and SS is widely recognized within the field for assessing the overall quality and treatability of wastewater.