Study Guide Answer Key

Here are the answers to the Jan. 19, 2021 edition of TPO's Exam Study Guide: 1. For primary clarifiers, what is the design parameter for hydraulic detention time?The answer to the question is B, 1.5 to 2.5 hours. The design parameters for primary clarifiers is generally designed for a hydraulic detention time of 1.5 to 2.5 hours, sludge blanket depth of 2 to 3 feet, and sludge concentrations of 3% to 6% total solids. These standards are from the WEF MOP 8, Design of Water Resource Recovery Facilities. Understanding design parameters of the wastewater plant equipment and processes is very important for operator knowledge. Having