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 Blowers and Evaluating Water Quality. This time you can test your knowledge about volatile solids calculations, and bacteriological sampling.
Wastewater Treatment Sample QuestionA digester is being fed with sludge that is 60% volatile solids. The sludge withdrawn is 40% volatile solids. What is the percent reduction in volatile solids?
A. 20%B. 39.6% C. 55.6%D. 67.1%
Water Treatment Sample Question
How many repeat bacteriological (total coliform) samples should an operator collect if a routine
