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 Trickling Filter Types; and Determining Lead Concentration. This time you can test your knowledge about excessive clarifier ashing, and calculating MRDL for chlorine.
Wastewater Treatment Sample Question
If you notice excessive ashing on the secondary clarifier in an activated sludge plant, what action might you try to correct the issue?
A. Increase the return activated sludge (RAS) to raise the mean cell residence time (MCRT)B. Increase the waste activated sludge (WAS) to reduce
