Exam (elaborations)
2024 WASTEWATER OPERATOR TN EXAM WITH CORRECT ANSWERS
- Course
- Institution
2024 WASTEWATER OPERATOR TN EXAM WITH CORRECT ANSWERS
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Elitaa. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $24.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
70055 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now