Welcome back to TPO magazine's new and improved Exam Study Guide Series, which offers a pair of water/wastewater study questions each week with in-depth explanations of the answers. We covered a set of wastewater and drinking water treatment questions last week on the topics of Volatile Acid to Alkalinity Ratio, and Odor-Reducing Chemicals. This week, you can test your knowledge about trickling filters and lime treatments. Take a look at the multiple-choice sample questions and answer explanations below.Sample Question No. 1:Which of the following is a method of increasing the efficiency of a trickling filter?A) Add an additional 7 vertical feet of rock media.B) Increase
