Wastewater Treatment Exam Questions and Answers, Exams of Water Resources Planning and Management

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Clint's ABC Wastewater Exam Questions

and Correct Verified Answers 2024-2025.

Graded A

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? - ANS470,577 gallons per day Chlorine combines with ammonia to form what? - ANSChloramines Chlorine is corrosive when it mixes with? - ANSMoisture Define BOD - ANSThe 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 Define endogenous respiration - ANSA situation where living organisms oxidize some of their own cell material instead of new organic matter they absorb or absorbed from their environment First action for a polymer spill? - ANSApply an absorbent to dispel such as sand or kitty litter and then sweep up the materials

How does an operator control the suspended solids in an activated sludge basin? - ANSWasting in return activated sludge How is the flow of current control from the chlorinator? - ANSThe rotameter Most nitrogen entering the plant is in the form of? - ANSOrganic nitrogen and ammonia Organisms that are both aerobic and anaerobic are called what? - ANSFacultative Preservation and holding times for BOD samples - ANS48 hours at<=6 degrees centigrade Primary clarification generally removes what percentage of TSS? - ANS40 to 60% Purpose of a desiccator - ANSTo allow residual samples to cool prior to weighing The best test to perform to determine the stabilization of waste in Arabic digestion is? - ANSVolatile solids The conversion of ammonia to nitrate is called what? - ANSNitrification The rakes in the primary clarifier jerk, skips or hangs, what should be done? - ANSDrain clarifier and determine the source of the problem

Total discharge head includes? - ANSDischarge pressure head + static discharge head + velocity head + friction head What are three physical factors that determine facultative pond efficacy? - ANSType of soil, surface area, death, wind action, sunlight, temperature, short circuit in, inflow variations What can the operator control with the activated sludge process? - ANSFlow, detention time, wasting and return rates What does hydrogen sulfide do in the collection system? - ANSCause corrosion What has addressed gases would an operator be potentially exposed to - ANSHydrogen sulfide, methane, and carbon dioxide What is the acceptable leak rate of a mechanical seal? - ANSMechanical seals should not leak What is the best way to control filamentous bacteria? - ANSAddition of chlorine to the return sludge What is the predominant organism responsible for stabilizing the waste in the trickling filter? - ANSBacteria What is the ratio of methane to carbon dioxide in a properly working anaerobic digester? - ANS65 to 70% methane and 30 to 35% carbon dioxide

What must be on the warning tag attached to a switch that has been locked out? - ANSSignature 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? - ANSOxygen meter What should be worn to enter a space with a large chlorine leak? - ANSSCBA What should the velocity of the sewage in a gravity sewer line be coming into the wastewater treatment plant? - ANSAt least 2.0 FPS What will happen if the flow to the grit chamber is too low? - ANSToo much organic material will be deposited When the do drops to less than one, nitrification? - ANSDecreases Where is the best location to collect a sample? - ANSA location that represents the entire waste stream or basin Where should air relief valves be located in a force main in the collection system?

• ANSAt the highest elevation in the line Why is waste water disinfected? - ANSTo destroy or disable pathogenic organisms You have an inflow of 100 gallons of stormwater into your collection system, how many people does this represent? - ANS100 gallons per person per day