Treatment Plant Operator Exam Study Guide Answers

What is the term for activated sludge that is collected in the secondary clarifier and then sent to the aeration basin? The answer to this question is D, return activated sludge (RAS). Many modern activated sludge plants are run automatically with most of the equipment programmed to operate at certain levels. Sometimes the operator has to make decisions to help the plant run better. One of these is determining the RAS flow. This can be based on current conditions, blanket levels in the clarifier or shock load remediation. By determining RAS levels, the operator decides where the sludge or bugs are