Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers. Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Types of Pumps and Chemical Reactions. This time you can test your knowledge about rotifers in activated sludge systems and arsenic regulations.
Wastewater Treatment Sample QuestionOperators 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?
A. Reduce ammonia-nitrogen B. Promote endogenous respirationC. Reduce BODD. None, the rotifers are
