Study Guide Answer Key

Here are the answers to the Aug. 23, 2021 edition of TPO's Exam Study Guide: 1. When conducting a sludge settleometer test, what does the first five minutes of the test indicate? The answer to this question is D, no useful indication. The settled sludge volume after five minutes of settling in the settleometer is an indication of how fast the sludge is settling. For the first five minutes the sludge is in a free fall state with only a few collisions of floc particles to slow it down (Eckenfelder and Melbinger, 1957). This is in a typical settleometer analysis, and there may be a few