Red Seal Plumbing Practice Exam

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What is used to determine the strength of sewage?

The total suspended solids
The pH level
Biochemical oxygen demand
Chemical oxygen demand

The correct answer is: The total suspended solids

Total suspended solids are used to determine the strength of sewage because they represent the solid particles that remain in the sewage after settling. These solids include organic matter, bacteria, and other pollutants that contribute to the overall strength of the sewage. The other options, such as pH level, biochemical oxygen demand (BOD), and chemical oxygen demand (COD), are also important factors in assessing sewage quality, but they do not directly measure the strength of sewage. The pH level measures the acidity or alkalinity of the sewage, BOD measures the amount of oxygen needed by microorganisms to break down organic matter in the sewage, and COD measures the amount of oxygen needed to chemically oxidize the organic matter in the sewage. While these factors are relevant in evaluating sewage, total suspended solids are specifically used to determine its strength.