Study Guide Answer Key

Here are the answers to the Aug. 9, 2021 edition of TPO's Exam Study Guide: 1. Operators and lab personnel look for rotifers in the system as an indicator of how well the activated sludge process is working. What role (if any) does the rotifer actually do in the activated sludge process? The answer to this question is C, reduce BOD. Rotifers are contributors to the reduction of biochemical oxygen demand, by consuming bacteria and solids. Rotifers in the slime walls also help control the slime growth and prevent anaerobic conditions in the slime wall. Rotifers are beneficial organisms in all forms of wastewater treatment. 2.