Treatment Plant Operator Exam Study Guide Answers

Here are the answers to the March 9, 2023 edition of TPO's Exam Study Guide: According to U.S. EPA Part 503 regulations, which type of sludge may be used as soil amendment and/or fertilizer for growing various crops (with some restrictions)? The answer to the question is C, both/either. Class A biosolids use one of many different processes to further reduce pathogen levels below detection limits (1,000 MPN fecal coliform bacteria per gram). Class B biosolids may have relatively high numbers of fecal coliform bacteria (2,000,000 MPN per gram).  Class B may be applied to private land without public access and Class A may