Study Guide Answer Key

Here are the answers to the Feb. 9, 2023 edition of TPO's Exam Study Guide: Oxidation-reduction Probes read changes in potential when dissolved oxygen is present and not present. ORP readings of -200 mV typically indicate what condition? The answer to this question is C, anaerobic conditions. ORPs are very useful in reading conditions of aerobic, anaerobic and anoxic processes. ORPs are vital for proper operation of many bio-nutrient removal processes. They can indicate nitrification or denitrification conditions. Nitrification readings are typically in the +150 to +350 mV range, while denitrification is usually -50 to +50 mV. Anaerobic conditions vital for biological