Study Guide Answer Key

Here are the answers to the June 17, 2021 edition of TPO's Exam Study Guide: 1. What term is defined as: “A measurement of how much acid can be added to water before there is a big change in pH.” The answer to the question is D, alkalinity. Alkalinity is discussed in aerobic and anaerobic digestion. Biological treatment works best when the pH is maintained in the 6.5 to 9.0 range and there is enough residual alkalinity to keep the pH in that range. Alkalinity is expressed as mg/l as CACO₃. Understanding some chemistry in aerobic and anaerobic digestion and the wastewater process