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33 Cards in this Set
- Front
- Back
Why is wastewater disinfected? |
Destroy or disable pathogenic organisms |
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The rakes in the primary clarifier jerk, skips or hangs, what should be done? |
Drain clarifier and determine the soure of the problem |
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The predominant organism responsible for stabilizing the waste in the trickling filter |
Bacteria |
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The air relief valve in a forced main in a collection system should be located |
at the highest elevation in the line |
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Hazardous gases that an operator could be exposed to |
Hydrogen sulfide, methane, carbon dioxide |
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Ratio of methane to carbon dioxide in a properly working anaerobic digester |
66-70% methane and 30-35% carbon dioxide |
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The best test to perform to determine the stabilization of waste in aerobic digestion system |
Volatile Solids |
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Organisms that are both aerobic and anaerobic |
Facultative |
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Conversion of ammonia to nitrate |
Nitrification |
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Purpose of adding seed to a BOD sample |
To add organisms to stabilize the organic material in the BOD sample |
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The 1st thing that should be done prior to performing a pH analysis |
calibrate the meter |
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sludge records must be maintained _______ years. |
5 |
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is added to wastewater in the form of slurry |
Lime |
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piston pump should be operated when |
suction and discharge valves are open |
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Electrical current travels in a cathodic protection |
From anode to pipe |
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Gases formed during anaerobic digestion |
Initially sulfide at start-up and then methane and carbon dioxide |
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The term for the protection of potentially hazardous materials entering the wastewater plant |
Pretreatment |
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best thing (tool) to have during a hazardous material spill |
MSDS |
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A pump and pump motor should be |
Aligned |
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Best way to record when maintenance is done |
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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an operators knows when air filters needs to be replaced when |
the differential pressure increases between the inlet side and the outlet side |
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some chemicals/reagents are stored in amber bottles due to |
may be sensitive or reactive with light |
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best way to prevent accidental releases of untreated waste |
clearly mark all pipes and valves |
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Air-gap Device |
should be used when water and wastewater in within close proximity |
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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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most important physical characteristic of pump lubricant |
Viscosity |
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maintenance of a V-notch weir |
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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GFCI switch |
monitors the current flowing from hot to neutral and opens (trips) the circuit in an imbalance is detected |
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a motor is allowed to run temporarily without a relief plug after lubrication to allow |
excess grease to drain out |
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problems caused by hydrogen sulfide gas |
corrosion of sewers, structures and equipment |
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DO levels in a pond are the lowest |
Early morning (algae consumes O2 at night) |
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freebee |
freebee |