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114 Cards in this Set
- Front
- Back
- 3rd side (hint)
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First action for a polymer spill? |
Apply an absorbent to the spill such as kitty litter or sand and then sweep up the material |
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Total Discharge Head includes? |
=Discharge pressure head+Static discharge head+Velocity head(outlet)+Friction head(discharge line) |
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Where is the best location to collect a sample? |
A location that represents the entire water stream or basin. |
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Preservation and hold times for BOD samples |
48 hours at <6 degrees Celsius |
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Define BOD |
The rate at which organisms use the oxygen in water or wastewater while stabilizing decomposable organic matter under aerobic conditions. In decomposition, organic matter serves as food for the bacteria and energy results from its oxidation. BOD measurements are used as a measure of organic strength of wastes in water. |
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Purpose of a dessicator. |
To allow residual samples to cool prior to weighing. |
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What will happen if the flow to a grit chamber is too low? |
Too much organic material will be deposited. |
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How does an operator control suspended solids in an activated sludge basin? |
Wasting and returning activated sludge. |
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Chlorine combines with ammonia to form what? |
Chloramines |
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What is the acceptable leak rate of a mechanical seal? |
Mechanical seals should not leak |
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What piece of equipment is required to enter a confined space? |
Oxygen meter |
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What should be worn to enter a space with a large chlorine leak? |
Self contained breathing apparatus (SCBA) |
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Why is wastewater disinfected? |
To destroy or disable pathogenic organisms |
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The rakes of a primary clarifier jerk, skips, or hangs, what should be done? |
Drain clarifier and determine the source of the problem. |
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What is the predominant organism, responsible for stabilizing the waste, in the trickling filter? |
Bacteria |
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Where should an air relief valve be located in a force main in a collection system? |
At the highest elevation in the line |
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What hazardous gases would an operator be potentially exposed to? |
Hydrogen sulfide, methane, and carbon dioxide |
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What is the ratio of methane to carbon dioxide in a properly working anaerobic digester? |
65-70% methane and 30-35% carbon dioxide |
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You have an inflow of 100 gallons of storm water into you collection system. How many people does this represent? |
1 (100-200 gallons per day per person) |
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What is the best way to control filamentous bacteria? |
Addition of chlorine to the return activated sludge (RAS) |
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The best test to perform to determine the stabilization of waste in aerobic digestion is? |
Volatile solids |
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What are three physical factors that determine facultative pond efficiency? |
Type of soil, surface area, depth, wind action, sunlight, temperature, short-circuiting, and inflow variations. |
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Organisms that are both aerobic and anaerobic are called what? |
Facultative |
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When the DO drops <1, nitrification? |
Decreases |
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The conversion of ammonia to nitrate is called what? |
Nitrification |
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Most nitrogen entering a plant is in the form of? |
Ammonia and organic nitrogen |
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Surface loading rate problem |
Total Flow applied, gpd/ area, ft2 |
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Convert horsepower to kW. |
1 horsepower=0.745 kW |
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A 5.2 acre lagoon with an influent 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 |
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Define endogenous respiration |
A situation where living organisms oxidize some of their own cellular mass instead of new organic matter they absorb or absorb from their environment. |
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What should the velocity of the sewage in a gravity sewer line be coming into the wastewater plant? |
At least 2.0 fps |
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What does hydrogen sulfide do in a collection system? |
Causes corrosion |
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What must be on the warning tag attached to a switch that has been locked out? |
Signature of person who locked out the switch (who is the only person authorized to remove tag) |
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Primary clarification generally removes what percentage of TSS? |
40 to 60% |
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How is the flow of chlorine controlled from the chloronater? |
Rotometer knob |
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Chlorine is corrosive when it mixes with? |
Moisture |
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Determine the pressure on the bottom of a tank from the height of water. |
Height, ft\2.31 psi/ft= psi on bottom of tank |
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Purpose for adding seed to a BOD sample? |
Too add organisms to stabilize the organic material in the BOD sample. |
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Purpose for adding seed to a BOD sample? |
Too add organisms to stabilize the organic material in the BOD sample. |
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What is the first thing that should be done prior to performing a pH analysis? |
Calibrate the meter |
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Purpose for adding seed to a BOD sample? |
Too add organisms to stabilize the organic material in the BOD sample. |
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What is the first thing that should be done prior to performing a pH analysis? |
Calibrate the meter |
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You have 60 lbs of material that is 21% chemical by weight. How many lbs of chemical do you have? |
12.6 lbs of chemical |
.21 x 60 lbs = 12.6 lbs |
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How long must sludge records be maintained? |
5 years |
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How long must sludge records be maintained? |
5 years |
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What material is added to wastewater in the form of slurry? |
Lime |
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How long must sludge records be maintained? |
5 years |
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What material is added to wastewater in the form of slurry? |
Lime |
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Disease causing organisms are called? |
Pathogenic |
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How long must sludge records be maintained? |
5 years |
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What material is added to wastewater in the form of slurry? |
Lime |
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Disease causing organisms are called? |
Pathogenic |
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What is "coning"? |
Development of cone-shaped flow of liquid, like a whirlpool, through sludge. This can occur in a sludge hopper during sludge withdrawal when the sludge becomes too thick. Part of the sludge remains in place while liquid rather than sludge flows out of the hopper. |
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A piston pump should be operated when? |
Suction and discharge valves are open |
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What gases are formed during anaerobic digestion? |
Initially hydrogen sulfide at start-up, then methane, and then carbon dioxide. |
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The term for the protection of potentially hazardous material from entering the wastewater plant is called what? |
Pretreatment |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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A pump and a pump motor should be? |
Aligned |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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A pump and a pump motor should be? |
Aligned |
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The best way to record when maintenance is done is? |
Work order system |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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A pump and a pump motor should be? |
Aligned |
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The best way to record when maintenance is done is? |
Work order system |
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The purpose of a thermal control circuit on a motor? |
Opens the circuit should the motor overheat |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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A pump and a pump motor should be? |
Aligned |
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The best way to record when maintenance is done is? |
Work order system |
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The purpose of a thermal control circuit on a motor? |
Opens the circuit should the motor overheat |
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You have an influent COD of 620 mg/L and an effluent COD of 26 mg/L. What is you % removal of COD? |
96% |
In-out/In x 100% |
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The best tool to have during a hazardous materials spill is? |
MSDS |
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A pump and a pump motor should be? |
Aligned |
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The best way to record when maintenance is done is? |
Work order system |
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The purpose of a thermal control circuit on a motor? |
Opens the circuit should the motor overheat |
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You have an influent COD of 620 mg/L and an effluent COD of 26 mg/L. What is you % removal of COD? |
96% |
In-out/In x 100% |
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What is the incubation time and temperature of a 5-day BOD? |
5 day incubation at 20 degrees Celcius. |
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When receiving deliveries you should do what for security purposes? |
Check all credentials of the driver |
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When receiving deliveries you should do what for security purposes? |
Check all credentials of the driver |
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How does the operator know when air filters need to be replaced? |
When the differential pressure increases between the inlet side and outlet side. |
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When receiving deliveries you should do what for security purposes? |
Check all credentials of the driver |
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How does the operator know when air filters need to be replaced? |
When the differential pressure increases between the inlet side and outlet side. |
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For safety purposes, what should be installed on the gears and other moving parts of clarifiers? |
Guards must be installed on gears and other moving parts that could be contacted accidentally. |
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Why are some chemicals/reagents stored in amber bottles? |
The chemical or reagent may be sensitive or reactive with light. |
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Why are some chemicals/reagents stored in amber bottles? |
The chemical or reagent may be sensitive or reactive with light. |
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The best way to prevent accidental release of untreated waste is to? |
Clearly mark all pipes and valves |
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Why are some chemicals/reagents stored in amber bottles? |
The chemical or reagent may be sensitive or reactive with light. |
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The best way to prevent accidental release of untreated waste is to? |
Clearly mark all pipes and valves |
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When potable water and wastewater are used within close proximity, what should you have? |
Air-gap Device |
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Why are some chemicals/reagents stored in amber bottles? |
The chemical or reagent may be sensitive or reactive with light. |
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The best way to prevent accidental release of untreated waste is to? |
Clearly mark all pipes and valves |
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When potable water and wastewater are used within close proximity, what should you have? |
Air-gap Device |
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The natural biological progression in an anaerobic digester is the? |
Acid formers and then the methane formers |
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The most important physical characteristics of a pump lubricant is? |
Viscosity |
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The most important physical characteristics of a pump lubricant is? |
Viscosity |
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Maintenance of a "V" -notch weir involves what? |
Clean and brush off deposits that accumulate in the weir. Keep weir and upstream and downstream channels clear of foreign bodies and interference. |
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The most important physical characteristics of a pump lubricant is? |
Viscosity |
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Maintenance of a "V" -notch weir involves what? |
Clean and brush off deposits that accumulate in the weir. Keep weir and upstream and downstream channels clear of foreign bodies and interference. |
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What does a GFCI actually do? |
The GFCI monitors the current flowing from hot to neutral and opens (trips) the circuit if an imbalance is detected. |
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Why is a motor allowed to run temporarily without a relief plug after lubtication? |
To allow excess grease to drain out. |
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Which of the following problems is/are caused by hydrogen sulfide gas? |
Corrosion of sewers, structures, and equipment. |
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Which of the following problems is/are caused by hydrogen sulfide gas? |
Corrosion of sewers, structures, and equipment. |
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At what time of day would the DO levels in a pond be the lowest? |
Early morning (algae consumes O2 at night) |
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Define "As-built" plans. |
A set of drawings or maps that indicates structures as they are currently built. If changes to these structures are made, then the "As-built" plans need to be updated to reflect these changes. |
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Which of the following problems is/are caused by hydrogen sulfide gas? |
Corrosion of sewers, structures, and equipment. |
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At what time of day would the DO levels in a pond be the lowest? |
Early morning (algae consumes O2 at night) |
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Define "As-built" plans. |
A set of drawings or maps that indicates structures as they are currently built. If changes to these structures are made, then the "As-built" plans need to be updated to reflect these changes. |
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What is the volume in cubic feet of a rectangle ?x?x? |
LxWxH |
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Calculate the volume in gallons of a digester with the diameter and depth |
(0.785)(D)(D)(HDL) x 7.48 gal/ft2 |
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If the flow slows down coming into a clarifier, what happens to the detention time? |
Increases |
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9000 gallons of 3.5% sludge are pumped to the thickeners daily. How many lbs of sludge are pumped daily? |
Sludge lb/day=sludge pumped gpdx8.34lb/g =9,000 gpd x 8.34 lb/gal =75,060 lb/day |
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If the chlorine dose is ?? and the chlorine residual is?? What is the chlorine demand? |
Dose-residual=demand |
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If the chlorine dose is ?? and the chlorine residual is?? What is the chlorine demand? |
Dose-residual=demand |
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If you subtract the chlorine dose and the chlorine residual. What is left? |
The chlorine demand |
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