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 Sludge Quality; and Manganese Greensand Filters. This time, you can test your knowledge about disinfection contact time, and pink coloration in manganese greensand filter effluent.
Wastewater Treatment Sample Question
Contact time varies from state to state. Most states require either 15 or 30 minutes at design average flow rate. Why is a minimum contact time so important for disinfection?
A. Chlorine gas is hazardous and has to be regulated.
B.
Exam Study Guide: Disinfection Contact Time; and Effluent Coloration
Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering these questions and others from our Exam Study Guide Series.
Nov 15, 2018 | by Rick Lallish and Drew Hoelscher |
