Clint's ABC Wastewater Exam Questions & Answers Already Passed!!

First action for a polymer spill? - Apply an absorbent to dispel such as sand or kitty litter and then sweep up the materials Total discharge head includes? - Discharge pressure head + static discharge head + velocity head + friction head Where is the best location to collect a sample? - A location that represents the entire waste stream or basin Preservation and holding times for BOD samples - 48 hours at<=6 degrees centigrade Define BOD - The rate at which organisms use the oxygen in water or wastewater while stabilizing decomposable organic matter under aerobic conditions. And decomposition, organic matter serves as food for the bacteria and energy results from its oxidation. VOD measurements are used as a measure of the organic strength of wastes and water Purpose of a desiccator - To allow residual samples to cool prior to weighing What will happen if the flow to the grit chamber is too low? - Too much organic material will be deposited How does an operator control the suspended solids in an activated sludge basin? - Wasting in return activated sludge Chlorine combines with ammonia to form what? - Chloramines What can the operator control with the activated sludge process? - Flow, detention time, wasting and return ratesWhat is the best way to control filamentous bacteria? - Addition of chlorine to the return sludge A 5.2 acre lagoon with an influence of 47,000 gallons per day is dropped 3 inches a day from a depth of 5 feet to a depth of 2 feet. How many gallons are discharged each day? - 470,577 gallons per day Define endogenous respiration - A situation where living organisms oxidize some of their own cell material instead of new organic matter they absorb or absorbed from their environment What should the velocity of the sewage in a gravity sewer line be coming into the wastewater treatment plant? - At least 2.0 FPS What does hydrogen sulfide do in the collection system? - Cause corrosion What must be on the warning tag attached to a switch that has been locked out? - Signature of person who locked out the switch and who is the only person authorized to remove the tag What piece of equipment is required to enter a confined space? - Oxygen meter Primary clarification generally removes what percentage of TSS? - 40 to 60% How is the flow of current control from the chlorinator? - The rotameter Chlorine is corrosive when it mixes with? - Moisture What is the acceptable leak rate of a mechanical seal? - Mechanical seals should not leak What should be worn to enter a space with a large chlorine leak? - SCBA Why is waste water disinfected? - To destroy or disable pathogenic organismsThe rakes in the primary clarifier jerk, skips or hangs, what should be done? - Drain clarifier and determine the source of the problem What is the predominant organism responsible for stabilizing the waste in the trickling filter? - Bacteria Where should air relief valves be located in a force main in the collection system? - At the highest elevation in the line What has addressed gases would an operator be potentially exposed to - Hydrogen sulfide, methane, and carbon dioxide What is the ratio of methane to carbon dioxide in a properly working anaerobic digester? - 65 to 70% methane and 30 to 35% carbon dioxide You have an inflow of 100 gallons of stormwater into your collection system, how many people does this represent? - 100 gallons per person per day The best test to perform to determine the stabilization of waste in Arabic digestion is? - Volatile solids What are three physical factors that determine facultative pond efficacy? - Type of soil, surface area, death, wind action, sunlight, temperature, short circuit in, inflow variations Organisms that are both aerobic and anaerobic are called what? - Facultative When the do drops to less than one, nitrification? - Decreases The conversion of ammonia to nitrate is called what? - NitrificationMost nitrogen entering the plant is in the form of? - Organic nitrogen and ammonia