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2024 WASTEWATER OPERATOR TN EXAM WITH CORRECT ANSWERS
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2024 WASTEWATER OPERATOR TN EXAM WITH CORRECT ANSWERS
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2024 WASTEWATER OPERATORTN EXAM WITH CORRECT
ANSWERS
Which of the following is not likely to develop if wastewater remains int eh
collection system too long? - CORRECT-ANSWERSAlgae
A high sewage pH can result int production of toxic gases due to : -
CORRECT-ANSWERSAmmonia
What problems do septic conditions in the collection system cause at the
treatment plant? - CORRECT-ANSWERSOdor and oxygen demand
___________ motors are often used with turbo blowers in order to meet the
blower speed requirements to provide improved efficiency - CORRECT-
ANSWERSPermanent magnet
Harmonic filters can be used to eliminate - CORRECT-ANSWERSInduced
harmonics from VFDs
_________ does not occur within a rotary lobe blower, but instead occurs at
the blower discharge - CORRECT-ANSWERSAir compression
A PM task that is commonly needed on rotary lobe blowers is _____ -
CORRECT-ANSWERSV belt inspection and re-tensioning
Rotary screw blowers are considered "hybrid" blowers because they use
both - CORRECT-ANSWERSPositive displacement and internal compression
__________ valves are the most commonly used valves for air isolation and
control - CORRECT-ANSWERSButterfly
Properly placed expansion joints are important in an air distribution
system to _______ - CORRECT-ANSWERSRelieve pain strain caused by
thermal expansion
The diffuser is the point at which _______ - CORRECT-ANSWERSAir is
injected into the process tank
Large bubble diffusers require significantly ________ than fine bubble
diffusers - CORRECT-ANSWERSLess maintenance and cleaning
,Fine bubble diffusers create bubbles that are _________ mm in diameter -
CORRECT-ANSWERS1.0-3.0
___________ can occur when blower inlet air filters allow too many particles
to pass through - CORRECT-ANSWERSAir side diffuser fouling
_____________ is a frequent mini cleaning technique where high air flows
are sent through membrane diffusers are short periods of time -
CORRECT-ANSWERSAir bumping
Treatment processes with _________ typically experience slower diffuser
bio fouling - CORRECT-ANSWERSHigh SRTs
Air transfer efficiency improves after cleaning because of _________ -
CORRECT-ANSWERSSmaller bubble size and slower rise rates
A variable pressure aeration control strategy uses the pressure resulting
from the ____________ to adjust the blower capacity and minimize system
pressure - CORRECT-ANSWERSMost open valve
Programmable logic controller based control systems improve aeration
system efficiently because - CORRECT-ANSWERSFacility flows and loads
are always changing
An aspect of jet aeration system design that makes maintenance easier is
- CORRECT-ANSWERSNo moving parts are located inside the process
tanks
High speed surface aerators - CORRECT-ANSWERSHave the impeller direct
coupled to the motor
Typical PM tanks for low speed surface aerators may include _________ -
CORRECT-ANSWERSChange the oil in the drive and grease the motor
Operators can adjust the ___________ to increase/decrease the OTR of a
horizontal rotor - CORRECT-ANSWERSSpeed of the shaft rotation
Decreasing the depth of a horizontal rotors blade submergence will
_________ - CORRECT-ANSWERSDecrease the amount of power needed to
operate the horizontal rotor
Mixer aerators transfer DO into process tanks primarily by _____________ -
CORRECT-ANSWERSShearing bubbles front he sparser ring and mixing
them into the process liquid
What are the components of mixer aerators - CORRECT-
ANSWERSSubmerged mixer body, sparger ring, separate air supply, and
platform mounted motor
,Mixer aerators not only provide good OTE but also provide - CORRECT-
ANSWERSExtra mixing energy along the tank floor
Preventative maintenance tasks for mixer aerators include - CORRECT-
ANSWERSChanging the oil after the recommended amount of run time
Why must wastes be treated before they are discharged into receiving
waters? - CORRECT-ANSWERS- Diseased bacteria
- Affect the dissolved oxygen levels
- Affect the odor or color of the water
- Solids accumulation
Which processes are used in wastewater treatment to remove
contaminants from wastewater? - CORRECT-ANSWERS- Chlorine
- Primary treatment (removes sludge and scum)
- Peracetic acid
- UV light
Ozone
What are the major types of waste discharge? - CORRECT-ANSWERS-
Organic
- Inorganic
Radioactive
Why should the discharge of organic wastes into a receiving water
concern operators? - CORRECT-ANSWERSIt could cause oxygen depletion
Which major contagious diseases could be spread by inadequately treated
wastewater? - CORRECT-ANSWERS- Giardiasis (giardia)
Cryptosporidiosis (Crypto)
Why are nutrients in the discharge of treated wastewater a concern? -
CORRECT-ANSWERS- It could contain nutrients that encourage excess
algae and plant growth
It could affect dissolved oxygen levels
What is organic waste? - CORRECT-ANSWERSWaste material that may
come from animal or plant sources
What is inorganic waste? - CORRECT-ANSWERSWaste material that is only
slightly affected by the actions of organisms
What are total solids? - CORRECT-ANSWERSInclude all solids present in
the wastewater; including suspended and dissolved both organic and
inorganic
What device is used to measure settleable solids in mL/L? - CORRECT-
ANSWERSSettleometer
, How is organic content of water measured? - CORRECT-ANSWERSBOD,
COD, and TOC
What is BOD? - CORRECT-ANSWERSThe measure of dissolved oxygen
consumed by aerobic organisms while stabilizing decomposable organic
matter under aerobic conditions
What is COD? - CORRECT-ANSWERSThe measure of oxygen-consuming
capacity of organic matter in wastewater
What is TOC? - CORRECT-ANSWERSThe measure of concentration of
organic carbon in water, including both soluble and particulate forms
What is one of the primary functions of a wastewater treatment plant? -
CORRECT-ANSWERS- Removal of solids from the wastewater
List the various types of solids removed by wastewater treatment plant -
CORRECT-ANSWERS- Total
- Dissolved
- Suspended
- Organic
- Inorganic
Suspended solids are composed of what two parts? - CORRECT-
ANSWERSSettleable and Non settleable
Which wastewater treatment process does not contribute significantly to
the reduction of pathogens in the wastewater plant effluent? - CORRECT-
ANSWERSDigestion
The general types of disinfection include - CORRECT-ANSWERSHeat
treatment, radiation treatment, and chemical treatment
Disadvantages to the use of ultraviolet radiation in the disinfection of
wastewater include: - CORRECT-ANSWERSHigh costs, scattering of the UV
irradiation by turbidity particles in the water, coating the tubes with
grease and slime
What chemicals are used as disinfectants? - CORRECT-ANSWERSBromine,
ozone, chlorine and chlorine compounds, iodine
What chemical has these characteristics: dark reddish-brown liquid;
vaporizes at room temperature; penetrating, suffocating odor - CORRECT-
ANSWERSBromine
What chemical has these characteristics: forms characteristic vapor on
changing gas-lustrous, black solid- chlorine like odor - CORRECT-
ANSWERSIodine
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